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Risks Arising from Financial Instruments - Summary of Effective Interest Rates at Balance Sheet (Detail) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging $ (6,864) $ (4,151)
Before hedging [Member] | Floating interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 6,649 6,441
Before hedging [Member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging $ 106,022 $ 96,601
Before hedging [Member] | Brazilian Real [member] | Floating interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 4.86% 9.33%
Hedging $ 276 $ 43
Before hedging [Member] | Brazilian Real [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 8.07% 9.00%
Hedging $ 560 $ 544
Before hedging [Member] | Canadian Dollar [member] | Floating interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 3.21%  
Hedging $ 145  
Before hedging [Member] | Canadian Dollar [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 3.15% 3.16%
Hedging $ 1,958 $ 2,055
Before hedging [Member] | Euro [member] | Floating interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 0.09% 0.08%
Hedging $ 4,648 $ 4,214
Before hedging [Member] | Euro [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 2.02% 1.82%
Hedging $ 29,335 $ 25,346
Before hedging [Member] | US Dollar [member] | Floating interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 1.67% 2.36%
Hedging $ 1,066 $ 1,749
Before hedging [Member] | US Dollar [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 4.78% 4.83%
Hedging $ 68,146 $ 62,205
Before hedging [Member] | Other currency [member] | Floating interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 15.47% 9.82%
Hedging $ 309 $ 225
Before hedging [Member] | Other currency [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 13.76% 7.31%
Hedging $ 354 $ 416
Before hedging [Member] | Australian Dollar [member] | Floating interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 1.07% 1.87%
Hedging $ 205 $ 210
Before hedging [Member] | Australian Dollar [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 3.71% 3.71%
Hedging $ 1,606 $ 1,647
Before hedging [Member] | Pound Sterling [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 3.82% 3.82%
Hedging $ 4,063 $ 4,373
Before hedging [Member] | South Korea [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging   3.37%
Hedging   $ 15
After hedging [Member] | Floating interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 9,149 9,690
After hedging [Member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging $ 103,522 $ 93,352
After hedging [Member] | Brazilian Real [member] | Floating interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 4.86% 9.33%
Hedging $ 276 $ 43
After hedging [Member] | Brazilian Real [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 8.07% 9.00%
Hedging $ 560 $ 544
After hedging [Member] | Canadian Dollar [member] | Floating interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 3.21%  
Hedging $ 145  
After hedging [Member] | Canadian Dollar [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 3.15% 3.16%
Hedging $ 1,958 $ 2,055
After hedging [Member] | Euro [member] | Floating interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 0.09% 0.08%
Hedging $ 4,648 $ 4,214
After hedging [Member] | Euro [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 1.73% 1.82%
Hedging $ 31,549 $ 29,338
After hedging [Member] | US Dollar [member] | Floating interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 2.03% 2.85%
Hedging $ 3,491 $ 4,269
After hedging [Member] | US Dollar [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 4.90% 5.02%
Hedging $ 64,593 $ 54,551
After hedging [Member] | Other currency [member] | Floating interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 12.57% 4.46%
Hedging $ 589 $ 954
After hedging [Member] | Other currency [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 12.84% 6.95%
Hedging $ 398 $ 489
After hedging [Member] | Australian Dollar [member] | Floating interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging   1.87%
Hedging   $ 210
After hedging [Member] | Australian Dollar [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging   3.71%
Hedging   $ 1,647
After hedging [Member] | Pound Sterling [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 3.79% 3.79%
Hedging $ 3,449 $ 3,713
After hedging [Member] | South Korea [member] | Fixed interest rate [member]    
Disclosure of offsetting financial assets and liabilities [line items]    
Hedging 2.46% 2.46%
Hedging $ 1,016 $ 1,015