Income Taxes - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Effective income tax rate	21.10%	21.60%	0.20%	(32.00%)
Unrecognized tax benefits	$ 333		$ 333		$ 464
Decrease in unrecognized tax benefits			131
Unrecognized tax benefits with tax positions that would impact effective tax rate	283		283		410
Interest and penalties expense (benefit)			(33)	$ 21
Interest and penalties accrued	$ 52		52		$ 85
Cash paid for income taxes, net of refunds			$ 293	$ 240