Lease Obligations - Lessee - Lease Costs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Leases [Abstract]
Amortization of ROU assets	$ 5	$ 5
Interest on lease liabilities	1	1
Total finance lease costs	6	6
Operating lease cost	22	20
Short-term lease cost	1	0
Variable lease cost	7	7
Sublease income	(1)	(1)
Total operating lease costs	29	26
Total lease costs	35	32
Impairment losses and termination charges	$ 1	$ 1