Leases - Other Information of Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows used for operating leases	$ 23	$ 23
Operating cash flows used for finance leases	2	2
Financing cash flows used for finance leases	4	2
Right-of-use assets obtained in exchange for new lease obligations:
Operating leases	22	17
Finance leases	$ 6	$ 17