Lease Obligations - Lessee - Lease Costs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Leases [Abstract]
Amortization of ROU assets	$ 5	$ 5
Interest on lease liabilities	1	1
Total finance lease costs	6	6
Operating lease cost	22	22
Short-term lease cost	0	1
Variable lease cost	8	7
Sublease income	(1)	(1)
Total operating lease costs	29	29
Total lease costs	35	35
Impairment losses and termination charges	$ 0	$ 1