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Hedge accounting (Detail 1) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Fair value hedges | Interest rate risk    
Disclosure Of Hedge Accounting [Line Items]    
Notional amount $ 246,909 $ 92,415
Derivative financial assets 3 0
Derivative financial liabilities 51 0
Changes in fair value of hedging instruments 2,275 (5,195)
Changes in fair value of hedged items (2,311) 5,169
Hedge ineffectiveness recognized in the income statement (36) (27)
Fair value hedges | Foreign exchange risk    
Disclosure Of Hedge Accounting [Line Items]    
Notional amount 33,877 20,566
Derivative financial assets 468 845
Derivative financial liabilities 291 3
Changes in fair value of hedging instruments 132 (1,088)
Changes in fair value of hedged items (151) 1,105
Hedge ineffectiveness recognized in the income statement (19) 18
Cash flow hedges | Interest rate risk    
Disclosure Of Hedge Accounting [Line Items]    
Notional amount 97,834 75,304
Derivative financial assets 3 2
Derivative financial liabilities 0 5
Changes in fair value of hedging instruments (337) (5,813)
Changes in fair value of hedged items 358 5,760
Hedge ineffectiveness recognized in the income statement 21 (53)
Hedges of net investments in foreign operations | Foreign exchange risk    
Disclosure Of Hedge Accounting [Line Items]    
Notional amount 38,668 14,009
Derivative financial assets 17 7
Derivative financial liabilities 1,270 529
Changes in fair value of hedging instruments (2,317) 336
Changes in fair value of hedged items 2,320 (337)
Hedge ineffectiveness recognized in the income statement $ 3 $ (1)