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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

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