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Other Current and Non-current Liabilities - Changes in Consolidated Other Current and Non-current Liabilities (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of other provisions [line items] |  |
Balance at beginning of period | $ 1,524 | $ 1,335
Additions or increase in estimates | 2,397 | 1,641
Releases or decrease in estimates | (2,168) | (1,527)
Reclassifications | 113 | 62
Accretion expense | (122) | (59)
Foreign currency translation | 12 | 72
Balance at end of period | 1,756 | 1,524
Current provisions | 759 | 599
Asset retirement obligations [Member] |  |
Disclosure of other provisions [line items] |  |
Balance at beginning of period | 327 |
Additions or increase in estimates | 80 |
Releases or decrease in estimates | (28) |
Reclassifications | 54 |
Accretion expense | (17) |
Foreign currency translation | (47) |
Balance at end of period | 369 | 327
Environmental liability [Member] |  |
Disclosure of other provisions [line items] |  |
Balance at beginning of period | 214 |
Additions or increase in estimates | 1 |
Accretion expense | 62 |
Foreign currency translation | (2) |
Balance at end of period | 275 | 214
Legal proceedings provision [Member] |  |
Disclosure of other provisions [line items] |  |
Balance at beginning of period | 30 |
Additions or increase in estimates | 3 |
Releases or decrease in estimates | (8) |
Foreign currency translation | 2 |
Balance at end of period | 27 | 30
Valuation derivative instruments [Member] |  |
Disclosure of other provisions [line items] |  |
Balance at beginning of period | 102 |
Additions or increase in estimates | 7 |
Foreign currency translation | (18) |
Balance at end of period | 91 | 102
Current provisions | 38 |
Other liabilities and provisions [Member] |  |
Disclosure of other provisions [line items] |  |
Balance at beginning of period | 851 |
Additions or increase in estimates | 2,306 |
Releases or decrease in estimates | (2,132) |
Reclassifications | 59 |
Accretion expense | (167) |
Foreign currency translation | 77 |
Balance at end of period | 994 | $ 851
Current provisions | $ 721 |

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