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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, 2021 | Dec. 31, 2020
Disclosure of other provisions [line items] |  |
Balance at beginning of period | $ 1,756 | $ 1,524
Additions or increase in estimates | 2,773 | 2,397
Releases or decrease in estimates | (2,538) | (2,168)
Reclassifications | 4 | 113
Accretion expense | (28) | (122)
Foreign currency translation | (10) | 12
Balance at end of period | 1,957 | 1,756
Current provisions | 659 | 759
Asset retirement obligations [Member] |  |
Disclosure of other provisions [line items] |  |
Balance at beginning of period | 369 |
Additions or increase in estimates | 267 |
Releases or decrease in estimates | (62) |
Reclassifications | (19) |
Accretion expense | (1) |
Foreign currency translation | (1) |
Balance at end of period | 553 | 369
Environmental liability [Member] |  |
Disclosure of other provisions [line items] |  |
Balance at beginning of period | 275 |
Additions or increase in estimates | 1 |
Releases or decrease in estimates | (2) |
Foreign currency translation | 2 |
Balance at end of period | 276 | 275
Legal proceedings provision [Member] |  |
Disclosure of other provisions [line items] |  |
Balance at beginning of period | 27 |
Additions or increase in estimates | 31 |
Releases or decrease in estimates | (9) |
Reclassifications | 17 |
Accretion expense | (1) |
Foreign currency translation | (17) |
Balance at end of period | 48 | 27
Valuation derivative instruments [Member] |  |
Disclosure of other provisions [line items] |  |
Balance at beginning of period | 91 |
Releases or decrease in estimates | (23) |
Foreign currency translation | (31) |
Balance at end of period | 37 | 91
Current provisions | 7 |
Other liabilities and provisions [Member] |  |
Disclosure of other provisions [line items] |  |
Balance at beginning of period | 994 |
Additions or increase in estimates | 2,474 |
Releases or decrease in estimates | (2,442) |
Reclassifications | 6 |
Accretion expense | (26) |
Foreign currency translation | 37 |
Balance at end of period | 1,043 | $ 994
Current provisions | $ 652 |

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