Leases (Cash Paid for Amounts Included in Measurement of Lease Liabilities) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating cash flows from finance leases	$ 1	$ 1	$ 1
Operating cash flows from operating leases	4	4	3
Financing cash flows from finance leases	$ 6	$ 8	$ 7