v3.25.4
Derivatives - Hedges of net investments in foreign operations (Details)
 12 Months Ended
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Disclosure of detailed information about hedging instruments [line items]    
Carrying amount, assets $ 6,179,000,000 $ 7,528,000,000
Carrying amount, liabilities $ 5,227,000,000 $ 5,005,000,000
Nominal amount 532,346,000,000 488,270,000,000
Hedges of net investment in foreign operations    
Disclosure of detailed information about hedging instruments [line items]    
Carrying amount, assets $ 95,000,000 $ 650,000,000
Carrying amount, liabilities $ (384,000,000) $ (7,000,000)
Nominal amount 46,251,000,000 34,967,000,000
Amounts recognised in OCI $ (191,000,000) $ 1,803,000,000
Change in fair value (1,993,000,000) 742,000,000
Gain (loss) on hedge ineffectiveness recognised in profit or loss 0 0
Hedges of net investment in foreign operations | Pound sterling-denominated structural foreign exchange    
Disclosure of detailed information about hedging instruments [line items]    
Carrying amount, assets 58,000,000 397,000,000
Carrying amount, liabilities $ (188,000,000) $ (1,000,000)
Nominal amount 17,114,000,000 15,407,000,000
Amounts recognised in OCI $ (291,000,000) $ 833,000,000
Change in fair value (1,124,000,000) 229,000,000
Gain (loss) on hedge ineffectiveness recognised in profit or loss 0 0
Hedges of net investment in foreign operations | Swiss franc-denominated structural foreign exchange    
Disclosure of detailed information about hedging instruments [line items]    
Carrying amount, assets 0 10,000,000
Carrying amount, liabilities $ (7,000,000) $ 0
Nominal amount 615,000,000 556,000,000
Amounts recognised in OCI $ 13,000,000 $ 89,000,000
Change in fair value (76,000,000) 40,000,000
Gain (loss) on hedge ineffectiveness recognised in profit or loss 0 0
Reclassification adjustments on hedge de-designation 110,000,000 110,000,000
Hedges of net investment in foreign operations | Hong Kong dollar-denominated structural foreign exchange    
Disclosure of detailed information about hedging instruments [line items]    
Carrying amount, assets 7,000,000 1,000,000
Carrying amount, liabilities $ 0 $ (3,000,000)
Nominal amount 5,761,000,000 5,844,000,000
Amounts recognised in OCI $ (29,000,000) $ (27,000,000)
Change in fair value (2,000,000) (26,000,000)
Gain (loss) on hedge ineffectiveness recognised in profit or loss 0 0
Hedges of net investment in foreign operations | Other structural foreign exchange3    
Disclosure of detailed information about hedging instruments [line items]    
Carrying amount, assets 30,000,000 242,000,000
Carrying amount, liabilities $ (189,000,000) $ (3,000,000)
Nominal amount 22,761,000,000 13,160,000,000
Amounts recognised in OCI $ 116,000,000 $ 907,000,000
Change in fair value (791,000,000) 499,000,000
Gain (loss) on hedge ineffectiveness recognised in profit or loss $ 0 $ 0