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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Income Tax Contingency [Line Items]
Effective tax rate	24.20%	25.70%	21.60%	23.20%
Provision for tax benefits related to settlement of employee awards			$ 54	$ 53
Provision for income taxes	$ 344	$ 271	456	$ 550
Liability for unrecognized tax benefits	513		513		$ 550
Unrecognized tax benefits, accrued interest	71		71		62
Unrecognized tax benefits that would impact effective tax rate	$ 164		$ 164		$ 160

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Unrecognized tax benefits including interest accrued net of deferred tax assets.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of interest expense accrued for an underpayment of income taxes.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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