Leases - Supplemental Cash Flow and Other Information Related to Leases (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Leases [Abstract]
Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases	$ 50	$ 56
Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from finance leases	4	1
Cash paid for amounts included in the measurement of lease liabilities: Financing cash flows from finance leases	6	1
Right-of-use assets obtained in exchange for new finance lease liabilities	31	0
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 69	$ 26