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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 257	$ 289
Effective tax rates	18.40%	30.40%
Provision for tax benefits related to settlement of employee awards	$ 92	$ 67
Effective tax rate	21.00%		35.00%
Liability for unrecognized tax benefits	$ 446		$ 439
Unrecognized tax benefits, accrued interest	48		44
Unrecognized tax benefits that would impact effective tax rate	$ 152		$ 145

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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.

+ References

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

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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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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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