Income Taxes - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Jun. 18, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Tax Contingency [Line Items]
Effective income tax rate		(7.40%)	33.80%	19.00%	34.90%
Federal statutory income tax rate				21.00%	21.00%
Discrete tax benefit related to statue of limitations expiration		$ (87)		$ 15
Reduction in valuation allowance		53
Tax expense, additional interest from uncertain tax positions		$ 47		8	$ 13
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	15
Tax due to adoption of CARES Act				5
Tax benefits for impairment of intangible assets			$ 246
Tax benefit for expirations of uncertain tax positions			74
Federal return to provision adjustments			$ 32
Tax benefit for state and local income tax adjustments					10
Change in foreign tax status adjustment				$ 23	14
Swiss Federal Tax Administration
Income Tax Contingency [Line Items]
Withholding tax refund					$ 13
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