Leases - Other Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating cash flows from operating leases	$ 35	$ 30
Leased assets obtained in exchange for new operating lease liabilities	$ 14	$ 154
Weighted average remaining lease term - operating leases, in years	5 years 3 months 18 days	5 years 6 months
Weighted average discount rate - operating leases	4.90%	5.00%