Income Taxes - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Effective income tax rate	22.60%	18.30%	9.20%	21.40%
Deferred tax asset, period increase (decrease)	$ 64		$ 64
Effective tax rate, period increase (decrease)			(9.50%)	3.40%
Unrecognized tax benefits, increase related to prior restructuring transaction				$ 37
Effective income tax rate reconciliation, stock option exercises		1.20%		2.90%