v3.25.4
Derivatives - Fair value hedges - Hedging instrument by hedged risk (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount 532,346 488,270
Carrying amount, assets $ 6,179 $ 7,528
Carrying amount, liabilities $ 5,227 $ 5,005
Fair value hedges    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount 233,741 190,332
Carrying amount, assets $ 3,851 $ 4,180
Carrying amount, liabilities 4,283 4,411
Change in fair value $ (661) $ (449)
Fair value hedges | HSBC Holdings    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount 92,281 90,074
Carrying amount, assets $ 571 $ 714
Carrying amount, liabilities 2,152 3,838
Change in fair value $ 1,137 $ (1,103)
Non-dynamic fair value hedges    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount 76,349 71,916
Weighted average rate of hedging instrument 3.15% 3.24%
Non-dynamic fair value hedges | HSBC Holdings    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount 92,281 90,074
Weighted average rate of hedging instrument 2.76% 2.78%
Cash flow hedges    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount 252,354 262,971
Carrying amount, assets $ 2,233 $ 2,707
Carrying amount, liabilities 560 587
Change in fair value 880 (503)
Change in fair value 891 (513)
Gain (loss) on hedge ineffectiveness recognised in profit or loss $ (11) $ 10
Interest rate    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount 423,761 406,109
Carrying amount, assets $ 4,946 $ 4,790
Carrying amount, liabilities 4,565 4,930
Interest rate | Fair value hedges    
Disclosure of detailed information about hedging instruments [line items]    
Change in fair value 659 441
Gain (loss) on hedge ineffectiveness recognised in profit or loss $ (2) $ (8)
Interest rate | Fair value hedges | HSBC Holdings    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount 91,600 90,074
Carrying amount, assets $ 561 $ 714
Carrying amount, liabilities 2,152 3,838
Change in fair value (1,144) 1,094
Gain (loss) on hedge ineffectiveness recognised in profit or loss $ (7) $ (9)
Foreign exchange    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount 108,585 82,161
Carrying amount, assets $ 1,233 $ 2,738
Carrying amount, liabilities $ 662 $ 75
Foreign exchange | Fair value hedges | HSBC Holdings    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount 681 0
Carrying amount, assets $ 10 $ 0
Carrying amount, liabilities $ 0 $ 0
Derivatives | Interest rate | Fair value hedges    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount 233,741 190,332
Carrying amount, assets $ 3,851 $ 4,180
Carrying amount, liabilities 4,283 4,411
Change in fair value $ (661) $ (449)
Derivatives | Interest rate | Fair value hedges | HSBC Holdings    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount 91,600 90,074
Carrying amount, assets $ 561 $ 714
Carrying amount, liabilities 2,152 3,838
Change in fair value $ 1,128 $ (1,103)
Derivatives | Interest rate | Cash flow hedges    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount 190,020 215,777
Carrying amount, assets $ 1,095 $ 619
Carrying amount, liabilities 282 519
Change in fair value 1,256 (2,954)
Change in fair value 1,267 (2,964)
Gain (loss) on hedge ineffectiveness recognised in profit or loss $ (11) $ 10
Derivatives | Foreign exchange | Fair value hedges | HSBC Holdings    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount 681 0
Carrying amount, assets $ 10 $ 0
Carrying amount, liabilities 0 0
Change in fair value $ 9 $ 0
Derivatives | Foreign exchange | Cash flow hedges    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount 62,334 47,194
Carrying amount, assets $ 1,138 $ 2,088
Carrying amount, liabilities 278 68
Change in fair value (376) 2,451
Change in fair value (376) 2,451
Gain (loss) on hedge ineffectiveness recognised in profit or loss $ 0 $ 0