Leases - Schedule of Lease Costs Recorded in Condensed Consolidated Statements of Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Finance lease cost:
Amortization of right-of-use assets			$ 1	$ 1
Interest on lease liabilities	$ 1	$ 1	2	2
Operating lease cost	46	46	93	94
Variable lease cost	13	17	23	30
Sublease income	(5)	(4)	(10)	(8)
Total lease cost, net	$ 55	$ 60	$ 109	$ 119