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Risks Arising from Financial Instruments - Summary of Effective Interest Rates at Balance Sheet (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging $ (5,886) $ (6,804)
Before hedging [Member] | Floating interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 2,310 3,962
Before hedging [Member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging $ 86,520 $ 94,602
Before hedging [Member] | Australian Dollar [member] | Floating interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 1.03% 0.99%
Hedging $ 218 $ 231
Before hedging [Member] | Australian Dollar [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 4.12% 3.91%
Hedging $ 324 $ 846
Before hedging [Member] | Brazilian Real [member] | Floating interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging   3.90%
Hedging   $ 164
Before hedging [Member] | Brazilian Real [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 7.21% 8.58%
Hedging $ 420 $ 578
Before hedging [Member] | Canadian Dollar [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 4.11% 4.12%
Hedging $ 626 $ 613
Before hedging [Member] | Euro [member] | Floating interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging   0.15%
Hedging $ 1,113 $ 2,690
Before hedging [Member] | Euro [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 2.27% 2.12%
Hedging $ 21,654 $ 26,092
Before hedging [Member] | Pound Sterling [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 4.35% 4.30%
Hedging $ 3,611 $ 3,655
Before hedging [Member] | South Korean Won [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 3.85%  
Hedging $ 32  
Before hedging [Member] | US Dollar [member] | Floating interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 1.67% 1.05%
Hedging $ 463 $ 617
Before hedging [Member] | US Dollar [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 4.93% 4.91%
Hedging $ 59,399 $ 62,340
Before hedging [Member] | Other currency [member] | Floating interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 7.22% 7.30%
Hedging $ 516 $ 260
Before hedging [Member] | Other currency [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 11.42% 11.96%
Hedging $ 454 $ 479
After hedging [Member] | Floating interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 6,164 6,461
After hedging [Member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging $ 82,666 $ 92,103
After hedging [Member] | Brazilian Real [member] | Floating interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging   3.90%
Hedging   $ 164
After hedging [Member] | Brazilian Real [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 7.21% 8.58%
Hedging $ 420 $ 578
After hedging [Member] | Canadian Dollar [member] | Floating interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 1.21% 1.23%
Hedging $ 2,043 $ 1,895
After hedging [Member] | Canadian Dollar [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 4.29% 4.29%
Hedging $ 3,158 $ 2,646
After hedging [Member] | Euro [member] | Floating interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging   0.15%
Hedging $ 1,113 $ 2,690
After hedging [Member] | Euro [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 2.11% 2.15%
Hedging $ 27,553 $ 35,515
After hedging [Member] | Pound Sterling [member] | Floating interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 1.05% 1.10%
Hedging $ 1,002 $ 937
After hedging [Member] | Pound Sterling [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 4.43% 4.36%
Hedging $ 2,937 $ 2,973
After hedging [Member] | South Korean Won [member] | Floating interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 1.67%  
Hedging $ 502  
After hedging [Member] | South Korean Won [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 0.87% 1.30%
Hedging $ 1,695 $ 1,997
After hedging [Member] | US Dollar [member] | Floating interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging   1.13%
Hedging   $ 201
After hedging [Member] | US Dollar [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 5.41% 5.30%
Hedging $ 46,288 $ 47,892
After hedging [Member] | Other currency [member] | Floating interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 5.99% 7.90%
Hedging $ 1,504 $ 573
After hedging [Member] | Other currency [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 8.80% 11.72%
Hedging $ 615 $ 502