v3.25.4
Report of Directors Financial Review Risk Report - IFRS 9 ECL sensitivity to future economic conditions (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of financial assets [line items]    
Financial assets $ 3,117,161 $ 2,923,319
ECL estimates, % weight assigned 100.00%  
Gross carrying amount    
Disclosure of financial assets [line items]    
Financial assets $ 2,486,661 2,350,371
Gross carrying amount | Wholesale    
Disclosure of financial assets [line items]    
Financial assets 2,064,949 1,958,010
Gross carrying amount | Wholesale | Stage 1 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets 1,940,746 1,830,264
Gross carrying amount | Wholesale | Stage 2 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets 124,203 127,746
Gross carrying amount | Retail Lending    
Disclosure of financial assets [line items]    
Financial assets 421,712 392,361
Gross carrying amount | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets 374,464 347,910
Gross carrying amount | Retail Lending | Mortgages | Stage 1 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets 353,960 311,875
Gross carrying amount | Retail Lending | Mortgages | Stage 2 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets 18,056 33,761
Gross carrying amount | Retail Lending | Mortgages | Stage 2 | Financial instruments credit-impaired    
Disclosure of financial assets [line items]    
Financial assets 2,448 2,274
Gross carrying amount | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets 24,990 23,290
Gross carrying amount | Retail Lending | Credit cards | Stage 1 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets 21,258 19,915
Gross carrying amount | Retail Lending | Credit cards | Stage 2 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets 3,450 3,107
Gross carrying amount | Retail Lending | Credit cards | Stage 2 | Financial instruments credit-impaired    
Disclosure of financial assets [line items]    
Financial assets 282 267
Gross carrying amount | Retail Lending | Other    
Disclosure of financial assets [line items]    
Financial assets 22,258 21,161
Gross carrying amount | Retail Lending | Other | Stage 1 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets 19,494 18,574
Gross carrying amount | Retail Lending | Other | Stage 2 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets 2,177 2,005
Gross carrying amount | Retail Lending | Other | Stage 2 | Financial instruments credit-impaired    
Disclosure of financial assets [line items]    
Financial assets 587 583
Allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (4,593) (4,618)
Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (1,905) (2,205)
Allowance for ECL | Wholesale | Stage 1 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (690) (689)
Allowance for ECL | Wholesale | Stage 2 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (1,214) (1,516)
Allowance for ECL | Retail Lending    
Disclosure of financial assets [line items]    
Financial assets (2,688) (2,413)
Allowance for ECL | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (446) (440)
Allowance for ECL | Retail Lending | Mortgages | Stage 1 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (54) (51)
Allowance for ECL | Retail Lending | Mortgages | Stage 2 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (106) (126)
Allowance for ECL | Retail Lending | Mortgages | Stage 2 | Financial instruments credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (286) (263)
Allowance for ECL | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (1,304) (1,116)
Allowance for ECL | Retail Lending | Credit cards | Stage 1 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (353) (276)
Allowance for ECL | Retail Lending | Credit cards | Stage 2 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (731) (655)
Allowance for ECL | Retail Lending | Credit cards | Stage 2 | Financial instruments credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (220) (185)
Allowance for ECL | Retail Lending | Other    
Disclosure of financial assets [line items]    
Financial assets (938) (856)
Allowance for ECL | Retail Lending | Other | Stage 1 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (253) (216)
Allowance for ECL | Retail Lending | Other | Stage 2 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (403) (360)
Allowance for ECL | Retail Lending | Other | Stage 2 | Financial instruments credit-impaired    
Disclosure of financial assets [line items]    
Financial assets $ (282) (279)
UK | Wholesale    
Disclosure of financial assets [line items]    
ECL estimates, % weight assigned 100.00%  
UK | Gross carrying amount | Wholesale    
Disclosure of financial assets [line items]    
Financial assets $ 465,228 432,160
UK | Gross carrying amount | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets 183,128 163,541
UK | Gross carrying amount | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets 8,317 7,415
UK | Gross carrying amount | Retail Lending | Other    
Disclosure of financial assets [line items]    
Financial assets 9,513 8,249
UK | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (598) (717)
UK | Allowance for ECL | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (132) (126)
UK | Allowance for ECL | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (356) (280)
UK | Allowance for ECL | Retail Lending | Other    
Disclosure of financial assets [line items]    
Financial assets (265) (241)
US | Gross carrying amount | Wholesale    
Disclosure of financial assets [line items]    
Financial assets 208,425 202,888
US | Gross carrying amount | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets 17,797 16,965
US | Gross carrying amount | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets 187 193
US | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (210) (216)
US | Allowance for ECL | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (4) (6)
US | Allowance for ECL | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets $ (14) (15)
Hong Kong | Wholesale    
Disclosure of financial assets [line items]    
ECL estimates, % weight assigned 100.00%  
Hong Kong | Gross carrying amount | Wholesale    
Disclosure of financial assets [line items]    
Financial assets $ 472,454 450,966
Hong Kong | Gross carrying amount | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets 106,736 106,866
Hong Kong | Gross carrying amount | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets 9,739 9,419
Hong Kong | Gross carrying amount | Retail Lending | Other    
Disclosure of financial assets [line items]    
Financial assets 6,085 6,210
Hong Kong | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (439) (659)
Hong Kong | Allowance for ECL | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (5) (5)
Hong Kong | Allowance for ECL | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (313) (293)
Hong Kong | Allowance for ECL | Retail Lending | Other    
Disclosure of financial assets [line items]    
Financial assets (146) (106)
Mainland China | Gross carrying amount | Wholesale    
Disclosure of financial assets [line items]    
Financial assets 133,814 137,960
Mainland China | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (188) (178)
Mexico | Gross carrying amount | Wholesale    
Disclosure of financial assets [line items]    
Financial assets 38,076 34,713
Mexico | Gross carrying amount | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets 8,430 7,482
Mexico | Gross carrying amount | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets 2,322 2,227
Mexico | Gross carrying amount | Retail Lending | Other    
Disclosure of financial assets [line items]    
Financial assets 3,727 3,722
Mexico | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (62) (69)
Mexico | Allowance for ECL | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (190) (165)
Mexico | Allowance for ECL | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (407) (337)
Mexico | Allowance for ECL | Retail Lending | Other    
Disclosure of financial assets [line items]    
Financial assets (437) (419)
UAE | Gross carrying amount | Wholesale    
Disclosure of financial assets [line items]    
Financial assets 62,827 58,909
UAE | Gross carrying amount | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets 2,306 1,993
UAE | Gross carrying amount | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets 591 536
UAE | Gross carrying amount | Retail Lending | Other    
Disclosure of financial assets [line items]    
Financial assets 620 688
UAE | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (52) (51)
UAE | Allowance for ECL | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (6) (8)
UAE | Allowance for ECL | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (39) (31)
UAE | Allowance for ECL | Retail Lending | Other    
Disclosure of financial assets [line items]    
Financial assets (12) (17)
France | Gross carrying amount | Wholesale    
Disclosure of financial assets [line items]    
Financial assets 196,137 184,591
France | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (121) (82)
Other geographies | Gross carrying amount | Wholesale    
Disclosure of financial assets [line items]    
Financial assets 487,987 455,823
Other geographies | Gross carrying amount | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets 56,067 51,064
Other geographies | Gross carrying amount | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets 3,834 3,500
Other geographies | Gross carrying amount | Retail Lending | Other    
Disclosure of financial assets [line items]    
Financial assets 2,313 2,292
Other geographies | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (234) (234)
Other geographies | Allowance for ECL | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (109) (131)
Other geographies | Allowance for ECL | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (175) (162)
Other geographies | Allowance for ECL | Retail Lending | Other    
Disclosure of financial assets [line items]    
Financial assets (78) (72)
Consensus Central scenario allowance for ECL | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (1,778) (2,031)
Consensus Central scenario allowance for ECL | Allowance for ECL | Wholesale | Stage 1 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (638) (632)
Consensus Central scenario allowance for ECL | Allowance for ECL | Wholesale | Stage 2 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (1,139) (1,399)
Consensus Central scenario allowance for ECL | Allowance for ECL | Retail Lending    
Disclosure of financial assets [line items]    
Financial assets (2,646) (2,351)
Consensus Central scenario allowance for ECL | Allowance for ECL | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (432) (425)
Consensus Central scenario allowance for ECL | Allowance for ECL | Retail Lending | Mortgages | Stage 1 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (53) (47)
Consensus Central scenario allowance for ECL | Allowance for ECL | Retail Lending | Mortgages | Stage 2 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (97) (117)
Consensus Central scenario allowance for ECL | Allowance for ECL | Retail Lending | Mortgages | Stage 2 | Financial instruments credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (282) (261)
Consensus Central scenario allowance for ECL | Allowance for ECL | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (1,290) (1,086)
Consensus Central scenario allowance for ECL | Allowance for ECL | Retail Lending | Credit cards | Stage 1 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (347) (267)
Consensus Central scenario allowance for ECL | Allowance for ECL | Retail Lending | Credit cards | Stage 2 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (723) (634)
Consensus Central scenario allowance for ECL | Allowance for ECL | Retail Lending | Credit cards | Stage 2 | Financial instruments credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (220) (185)
Consensus Central scenario allowance for ECL | Allowance for ECL | Retail Lending | Other    
Disclosure of financial assets [line items]    
Financial assets (924) (839)
Consensus Central scenario allowance for ECL | Allowance for ECL | Retail Lending | Other | Stage 1 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (249) (204)
Consensus Central scenario allowance for ECL | Allowance for ECL | Retail Lending | Other | Stage 2 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (393) (355)
Consensus Central scenario allowance for ECL | Allowance for ECL | Retail Lending | Other | Stage 2 | Financial instruments credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (282) (279)
Consensus Central scenario allowance for ECL | UK | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (571) (667)
Consensus Central scenario allowance for ECL | UK | Allowance for ECL | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (124) (117)
Consensus Central scenario allowance for ECL | UK | Allowance for ECL | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (354) (275)
Consensus Central scenario allowance for ECL | UK | Allowance for ECL | Retail Lending | Other    
Disclosure of financial assets [line items]    
Financial assets (261) (233)
Consensus Central scenario allowance for ECL | US | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (194) (201)
Consensus Central scenario allowance for ECL | US | Allowance for ECL | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (4) (6)
Consensus Central scenario allowance for ECL | US | Allowance for ECL | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (14) (14)
Consensus Central scenario allowance for ECL | Hong Kong | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (401) (616)
Consensus Central scenario allowance for ECL | Hong Kong | Allowance for ECL | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (4) (5)
Consensus Central scenario allowance for ECL | Hong Kong | Allowance for ECL | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (306) (275)
Consensus Central scenario allowance for ECL | Hong Kong | Allowance for ECL | Retail Lending | Other    
Disclosure of financial assets [line items]    
Financial assets (137) (102)
Consensus Central scenario allowance for ECL | Mainland China | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (176) (141)
Consensus Central scenario allowance for ECL | Mexico | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (58) (61)
Consensus Central scenario allowance for ECL | Mexico | Allowance for ECL | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (188) (162)
Consensus Central scenario allowance for ECL | Mexico | Allowance for ECL | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (403) (333)
Consensus Central scenario allowance for ECL | Mexico | Allowance for ECL | Retail Lending | Other    
Disclosure of financial assets [line items]    
Financial assets (437) (416)
Consensus Central scenario allowance for ECL | UAE | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (51) (49)
Consensus Central scenario allowance for ECL | UAE | Allowance for ECL | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (6) (8)
Consensus Central scenario allowance for ECL | UAE | Allowance for ECL | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (39) (31)
Consensus Central scenario allowance for ECL | UAE | Allowance for ECL | Retail Lending | Other    
Disclosure of financial assets [line items]    
Financial assets (11) (17)
Consensus Central scenario allowance for ECL | France | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (117) (80)
Consensus Central scenario allowance for ECL | Other geographies | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (208) (216)
Consensus Central scenario allowance for ECL | Other geographies | Allowance for ECL | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (106) (127)
Consensus Central scenario allowance for ECL | Other geographies | Allowance for ECL | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (174) (159)
Consensus Central scenario allowance for ECL | Other geographies | Allowance for ECL | Retail Lending | Other    
Disclosure of financial assets [line items]    
Financial assets (78) (72)
Consensus Upside scenario allowance for ECL | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (1,477) (1,612)
Consensus Upside scenario allowance for ECL | Allowance for ECL | Wholesale | Stage 1 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (522) (494)
Consensus Upside scenario allowance for ECL | Allowance for ECL | Wholesale | Stage 2 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (955) (1,118)
Consensus Upside scenario allowance for ECL | Allowance for ECL | Retail Lending    
Disclosure of financial assets [line items]    
Financial assets (2,570) (2,285)
Consensus Upside scenario allowance for ECL | Allowance for ECL | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (412) (405)
Consensus Upside scenario allowance for ECL | Allowance for ECL | Retail Lending | Mortgages | Stage 1 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (50) (43)
Consensus Upside scenario allowance for ECL | Allowance for ECL | Retail Lending | Mortgages | Stage 2 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (88) (107)
Consensus Upside scenario allowance for ECL | Allowance for ECL | Retail Lending | Mortgages | Stage 2 | Financial instruments credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (274) (255)
Consensus Upside scenario allowance for ECL | Allowance for ECL | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (1,261) (1,064)
Consensus Upside scenario allowance for ECL | Allowance for ECL | Retail Lending | Credit cards | Stage 1 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (335) (258)
Consensus Upside scenario allowance for ECL | Allowance for ECL | Retail Lending | Credit cards | Stage 2 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (706) (621)
Consensus Upside scenario allowance for ECL | Allowance for ECL | Retail Lending | Credit cards | Stage 2 | Financial instruments credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (220) (185)
Consensus Upside scenario allowance for ECL | Allowance for ECL | Retail Lending | Other    
Disclosure of financial assets [line items]    
Financial assets (897) (816)
Consensus Upside scenario allowance for ECL | Allowance for ECL | Retail Lending | Other | Stage 1 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (233) (193)
Consensus Upside scenario allowance for ECL | Allowance for ECL | Retail Lending | Other | Stage 2 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (382) (343)
Consensus Upside scenario allowance for ECL | Allowance for ECL | Retail Lending | Other | Stage 2 | Financial instruments credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (282) (279)
Consensus Upside scenario allowance for ECL | UK | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (513) (526)
Consensus Upside scenario allowance for ECL | UK | Allowance for ECL | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (117) (107)
Consensus Upside scenario allowance for ECL | UK | Allowance for ECL | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (338) (265)
Consensus Upside scenario allowance for ECL | UK | Allowance for ECL | Retail Lending | Other    
Disclosure of financial assets [line items]    
Financial assets (238) (217)
Consensus Upside scenario allowance for ECL | US | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (166) (205)
Consensus Upside scenario allowance for ECL | US | Allowance for ECL | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (4) (6)
Consensus Upside scenario allowance for ECL | US | Allowance for ECL | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (14) (14)
Consensus Upside scenario allowance for ECL | Hong Kong | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (305) (465)
Consensus Upside scenario allowance for ECL | Hong Kong | Allowance for ECL | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (3) (4)
Consensus Upside scenario allowance for ECL | Hong Kong | Allowance for ECL | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (300) (268)
Consensus Upside scenario allowance for ECL | Hong Kong | Allowance for ECL | Retail Lending | Other    
Disclosure of financial assets [line items]    
Financial assets (136) (101)
Consensus Upside scenario allowance for ECL | Mainland China | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (137) (84)
Consensus Upside scenario allowance for ECL | Mexico | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (47) (46)
Consensus Upside scenario allowance for ECL | Mexico | Allowance for ECL | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (180) (155)
Consensus Upside scenario allowance for ECL | Mexico | Allowance for ECL | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (398) (330)
Consensus Upside scenario allowance for ECL | Mexico | Allowance for ECL | Retail Lending | Other    
Disclosure of financial assets [line items]    
Financial assets (435) (413)
Consensus Upside scenario allowance for ECL | UAE | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (47) (40)
Consensus Upside scenario allowance for ECL | UAE | Allowance for ECL | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (6) (8)
Consensus Upside scenario allowance for ECL | UAE | Allowance for ECL | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (38) (31)
Consensus Upside scenario allowance for ECL | UAE | Allowance for ECL | Retail Lending | Other    
Disclosure of financial assets [line items]    
Financial assets (11) (17)
Consensus Upside scenario allowance for ECL | France | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (103) (69)
Consensus Upside scenario allowance for ECL | Other geographies | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (158) (176)
Consensus Upside scenario allowance for ECL | Other geographies | Allowance for ECL | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (102) (124)
Consensus Upside scenario allowance for ECL | Other geographies | Allowance for ECL | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (173) (156)
Consensus Upside scenario allowance for ECL | Other geographies | Allowance for ECL | Retail Lending | Other    
Disclosure of financial assets [line items]    
Financial assets (77) (69)
Consensus Downside scenario allowance for ECL | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (2,399) (2,877)
Consensus Downside scenario allowance for ECL | Allowance for ECL | Wholesale | Stage 1 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (830) (797)
Consensus Downside scenario allowance for ECL | Allowance for ECL | Wholesale | Stage 2 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (1,569) (2,080)
Consensus Downside scenario allowance for ECL | Allowance for ECL | Retail Lending    
Disclosure of financial assets [line items]    
Financial assets (2,735) (2,440)
Consensus Downside scenario allowance for ECL | Allowance for ECL | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (462) (456)
Consensus Downside scenario allowance for ECL | Allowance for ECL | Retail Lending | Mortgages | Stage 1 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (61) (58)
Consensus Downside scenario allowance for ECL | Allowance for ECL | Retail Lending | Mortgages | Stage 2 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (108) (129)
Consensus Downside scenario allowance for ECL | Allowance for ECL | Retail Lending | Mortgages | Stage 2 | Financial instruments credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (293) (269)
Consensus Downside scenario allowance for ECL | Allowance for ECL | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (1,321) (1,124)
Consensus Downside scenario allowance for ECL | Allowance for ECL | Retail Lending | Credit cards | Stage 1 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (366) (284)
Consensus Downside scenario allowance for ECL | Allowance for ECL | Retail Lending | Credit cards | Stage 2 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (735) (656)
Consensus Downside scenario allowance for ECL | Allowance for ECL | Retail Lending | Credit cards | Stage 2 | Financial instruments credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (220) (185)
Consensus Downside scenario allowance for ECL | Allowance for ECL | Retail Lending | Other    
Disclosure of financial assets [line items]    
Financial assets (952) (860)
Consensus Downside scenario allowance for ECL | Allowance for ECL | Retail Lending | Other | Stage 1 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (265) (217)
Consensus Downside scenario allowance for ECL | Allowance for ECL | Retail Lending | Other | Stage 2 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (405) (363)
Consensus Downside scenario allowance for ECL | Allowance for ECL | Retail Lending | Other | Stage 2 | Financial instruments credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (282) (279)
Consensus Downside scenario allowance for ECL | UK | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (680) (850)
Consensus Downside scenario allowance for ECL | UK | Allowance for ECL | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (138) (132)
Consensus Downside scenario allowance for ECL | UK | Allowance for ECL | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (355) (276)
Consensus Downside scenario allowance for ECL | UK | Allowance for ECL | Retail Lending | Other    
Disclosure of financial assets [line items]    
Financial assets (276) (243)
Consensus Downside scenario allowance for ECL | US | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (264) (247)
Consensus Downside scenario allowance for ECL | US | Allowance for ECL | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (5) (6)
Consensus Downside scenario allowance for ECL | US | Allowance for ECL | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (14) (15)
Consensus Downside scenario allowance for ECL | Hong Kong | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (570) (906)
Consensus Downside scenario allowance for ECL | Hong Kong | Allowance for ECL | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (6) (5)
Consensus Downside scenario allowance for ECL | Hong Kong | Allowance for ECL | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (324) (300)
Consensus Downside scenario allowance for ECL | Hong Kong | Allowance for ECL | Retail Lending | Other    
Disclosure of financial assets [line items]    
Financial assets (144) (105)
Consensus Downside scenario allowance for ECL | Mainland China | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (256) (329)
Consensus Downside scenario allowance for ECL | Mexico | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (76) (86)
Consensus Downside scenario allowance for ECL | Mexico | Allowance for ECL | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (193) (168)
Consensus Downside scenario allowance for ECL | Mexico | Allowance for ECL | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (409) (338)
Consensus Downside scenario allowance for ECL | Mexico | Allowance for ECL | Retail Lending | Other    
Disclosure of financial assets [line items]    
Financial assets (442) (422)
Consensus Downside scenario allowance for ECL | UAE | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (56) (58)
Consensus Downside scenario allowance for ECL | UAE | Allowance for ECL | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (6) (8)
Consensus Downside scenario allowance for ECL | UAE | Allowance for ECL | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (40) (31)
Consensus Downside scenario allowance for ECL | UAE | Allowance for ECL | Retail Lending | Other    
Disclosure of financial assets [line items]    
Financial assets (12) (17)
Consensus Downside scenario allowance for ECL | France | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (139) (97)
Consensus Downside scenario allowance for ECL | Other geographies | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (358) (304)
Consensus Downside scenario allowance for ECL | Other geographies | Allowance for ECL | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (114) (136)
Consensus Downside scenario allowance for ECL | Other geographies | Allowance for ECL | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (179) (164)
Consensus Downside scenario allowance for ECL | Other geographies | Allowance for ECL | Retail Lending | Other    
Disclosure of financial assets [line items]    
Financial assets (78) (73)
Downside 2 scenario allowance for ECL | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (4,485) (6,555)
Downside 2 scenario allowance for ECL | Allowance for ECL | Wholesale | Stage 1 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (971) (803)
Downside 2 scenario allowance for ECL | Allowance for ECL | Wholesale | Stage 2 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (3,514) (5,751)
Downside 2 scenario allowance for ECL | Allowance for ECL | Retail Lending    
Disclosure of financial assets [line items]    
Financial assets (3,637) (3,928)
Downside 2 scenario allowance for ECL | Allowance for ECL | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (714) (708)
Downside 2 scenario allowance for ECL | Allowance for ECL | Retail Lending | Mortgages | Stage 1 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (161) (129)
Downside 2 scenario allowance for ECL | Allowance for ECL | Retail Lending | Mortgages | Stage 2 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (216) (275)
Downside 2 scenario allowance for ECL | Allowance for ECL | Retail Lending | Mortgages | Stage 2 | Financial instruments credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (337) (304)
Downside 2 scenario allowance for ECL | Allowance for ECL | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (1,693) (1,915)
Downside 2 scenario allowance for ECL | Allowance for ECL | Retail Lending | Credit cards | Stage 1 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (553) (701)
Downside 2 scenario allowance for ECL | Allowance for ECL | Retail Lending | Credit cards | Stage 2 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (913) (1,027)
Downside 2 scenario allowance for ECL | Allowance for ECL | Retail Lending | Credit cards | Stage 2 | Financial instruments credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (227) (188)
Downside 2 scenario allowance for ECL | Allowance for ECL | Retail Lending | Other    
Disclosure of financial assets [line items]    
Financial assets (1,230) (1,305)
Downside 2 scenario allowance for ECL | Allowance for ECL | Retail Lending | Other | Stage 1 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (444) (532)
Downside 2 scenario allowance for ECL | Allowance for ECL | Retail Lending | Other | Stage 2 | Financial instruments not credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (494) (483)
Downside 2 scenario allowance for ECL | Allowance for ECL | Retail Lending | Other | Stage 2 | Financial instruments credit-impaired    
Disclosure of financial assets [line items]    
Financial assets (292) (290)
Downside 2 scenario allowance for ECL | UK | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (1,119) (2,389)
Downside 2 scenario allowance for ECL | UK | Allowance for ECL | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (274) (288)
Downside 2 scenario allowance for ECL | UK | Allowance for ECL | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (419) (447)
Downside 2 scenario allowance for ECL | UK | Allowance for ECL | Retail Lending | Other    
Disclosure of financial assets [line items]    
Financial assets (370) (351)
Downside 2 scenario allowance for ECL | US | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (563) (461)
Downside 2 scenario allowance for ECL | US | Allowance for ECL | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (8) (8)
Downside 2 scenario allowance for ECL | US | Allowance for ECL | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (16) (17)
Downside 2 scenario allowance for ECL | Hong Kong | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (1,143) (1,496)
Downside 2 scenario allowance for ECL | Hong Kong | Allowance for ECL | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (13) (10)
Downside 2 scenario allowance for ECL | Hong Kong | Allowance for ECL | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (496) (770)
Downside 2 scenario allowance for ECL | Hong Kong | Allowance for ECL | Retail Lending | Other    
Disclosure of financial assets [line items]    
Financial assets (173) (249)
Downside 2 scenario allowance for ECL | Mainland China | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (397) (886)
Downside 2 scenario allowance for ECL | Mexico | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (202) (302)
Downside 2 scenario allowance for ECL | Mexico | Allowance for ECL | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (237) (215)
Downside 2 scenario allowance for ECL | Mexico | Allowance for ECL | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (514) (423)
Downside 2 scenario allowance for ECL | Mexico | Allowance for ECL | Retail Lending | Other    
Disclosure of financial assets [line items]    
Financial assets (589) (593)
Downside 2 scenario allowance for ECL | UAE | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (82) (120)
Downside 2 scenario allowance for ECL | UAE | Allowance for ECL | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (7) (8)
Downside 2 scenario allowance for ECL | UAE | Allowance for ECL | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (46) (35)
Downside 2 scenario allowance for ECL | UAE | Allowance for ECL | Retail Lending | Other    
Disclosure of financial assets [line items]    
Financial assets (13) (19)
Downside 2 scenario allowance for ECL | France | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (188) (125)
Downside 2 scenario allowance for ECL | Other geographies | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (790) (774)
Downside 2 scenario allowance for ECL | Other geographies | Allowance for ECL | Retail Lending | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (175) (180)
Downside 2 scenario allowance for ECL | Other geographies | Allowance for ECL | Retail Lending | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (202) (223)
Downside 2 scenario allowance for ECL | Other geographies | Allowance for ECL | Retail Lending | Other    
Disclosure of financial assets [line items]    
Financial assets $ (85) $ (93)