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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Income Tax Contingency [Line Items]
Effective tax rate	25.70%	24.90%	23.20%	21.20%
Provision for tax benefits related to settlement of employee awards	$ 4	$ 4	$ 53	$ 96
Liability for unrecognized tax benefits	510		510		$ 435
Unrecognized tax benefits, accrued interest	60		60		48
Unrecognized tax benefits that would impact effective tax rate	153		153		$ 137
Provision for income taxes	$ 271	$ 272	$ 550	$ 529

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- Definition

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

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- Definition

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

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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