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Risks Arising from Financial Instruments - Summary of Interest Expense Recognized on Unhedged and Hedged Financial Liabilities (Detail) - Interest Rate Risk [Member] - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about hedging instruments [line items]      
Interest expense $ (3,194) $ (3,443) $ (3,705)
Fair value hedges [member] | Hedged Item [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Interest expense (31) (30) (22)
Cash flow hedges [member] | Hedged Item [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Interest expense 26 29 28
Net investment hedges [member] | Hedging Instrument [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Interest expense 58 49 10
Economic Hedges [Member] | Hedged Item [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Interest expense 3 2 0
Financial Liabilities at Amortised Cost, Class [Member] | Not Designated in Hedging Relationship [Member]      
Disclosure of detailed information about hedging instruments [line items]      
Interest expense $ (3,250) $ (3,492) $ (3,722)