Leases - Supplemental Cash Flow Information Related to Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash outflows from operating leases	$ 167	$ 189	$ 173
Operating cash outflows from finance leases	2	3	3
Financing cash outflows from finance leases	22	26	25
ROU assets obtained in exchange for lease obligations:
Operating leases	122	189	89
Finance leases	$ 20	$ 9	$ 68