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Income Taxes - Out of Period Adjustment (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Oct. 01, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Provision for income taxes | $ 340 | $ 222 | $ 797 | $ 525 |  |
Goodwill | 21,277 |  | 21,277 |  | $ 20,184 |
Andeavor |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 17,335
Andeavor | Adjustments |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Provision for income taxes |  |  | 36 |  |  |
Deferred tax liabilities | 68 |  | 68 |  |  |
Goodwill | $ 32 |  | $ 32 |  |  | $ 1,021

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