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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

X

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Amount of deferred tax liability attributable to taxable temporary differences.

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