Income Taxes - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Unrecognized tax benefit, affect the effective tax rate	$ 16	$ 24	$ 19
Accruals for payment of interest and penalties associated with uncertain tax positions	5	10	$ 7
Increase (decrease) in accruals for payment of interest and penalties associated with uncertain tax positions	(5)	3
Net deferred tax asset	$ 1,011	$ 1,300