Leases - Supplemental Cash Flow Information Related to Leases (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Cash paid for amounts included in the measurement of lease obligations:
Cash paid for operating leases (operating cash flows)	$ 87	$ 218
Cash paid for finance leases (operating cash flows)	18	20
Cash paid for finance leases (financing cash flows)	18	17
Noncash transactions:
Operating Leases - Leased assets recognized for new lease obligations incurred	12	51
Finance Leases - Leased assets recognized for new lease obligations incurred	0	0
Operating Leases - Changes in leased assets and lease obligations due to lease modifications	29	123
Finance Leases - Changes in leased assets and lease obligations due to lease modifications	$ 0	$ 0