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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended			6 Months Ended
	Jun. 18, 2019	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Tax Contingency [Line Items]
Effective income tax rate		16.10%		19.60%	13.60%	16.90%
Federal statutory income tax rate					21.00%	21.00%
Discrete tax benefit related to statue of limitations expiration		$ 23			$ (15)
Tax benefit due to prior period adjustments					8
Tax expense related to change in status of certain entities					27
Excess tax expense, share-based payment arrangement			$ 8		4
Tax due to adoption of CARES Act					$ 5
Discrete tax adjustments				$ 13
Tax adjustment due to uncertain tax liabilities				11
Discrete tax expense				14
Accrual of interest for uncertain tax liabilities				$ 5
Tax benefit for state and local income tax adjustments						$ 10
Tax expense, additional interest from uncertain tax positions		$ 4				$ 4
Minimum | Internal Revenue Service | 2018 Tax Year
Income Tax Contingency [Line Items]
Unrecognized income tax expense due to change in tax regulations	$ 180
Maximum | Internal Revenue Service | 2018 Tax Year
Income Tax Contingency [Line Items]
Unrecognized income tax expense due to change in tax regulations	$ 220

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