Leases - Activities Associated With Operating Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Fixed lease expenses	$ 39	$ 35	$ 37
Variable lease expenses	37	34	29
Total lease expenses	76	69	66
Cash paid for leases	76	69	67
ROU assets obtained in exchange for lease obligations	32	55	42
Reductions of ROU assets and lease liabilities	0	(3)	(16)
Net non-cash increases to ROU assets and lease liabilities	$ 32	$ 52	$ 26