Leases - Summary of Cash Flows Related to Leases (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from finance leases	$ 0	$ 1,000,000
Operating cash flows from operating leases	141,000,000	143,000,000
Financing cash flows from finance leases	2,000,000	2,000,000
Right-of-use assets obtained in exchange for lease obligations: (b)
Operating leases	85,000,000	86,000,000
Finance leases	$ 0	$ 0