Leases - Components of Lease Cost and Rent Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Leases [Abstract]
Operating lease cost	$ 53	$ 50	$ 104	$ 99
Short-term rent expense	21	23	44	47
Variable lease cost	5	6	9	12
Sublease income	(1)	(1)	(2)	(2)
Total operating lease cost	78	78	155	156
Finance lease cost:
Amortization of right-of-use assets	4	1	7	4
Interest on finance lease liabilities	4	2	8	3
Total finance lease cost	$ 8	$ 3	$ 15	$ 7