Lease Obligations - Lessee - Lease Costs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Leases [Abstract]
Amortization of ROU assets	$ 5	$ 5	$ 10	$ 9
Interest on lease liabilities	1	1	2	2
Total finance lease costs	6	6	12	11
Operating lease cost	22	21	44	40
Short-term lease cost	1	0	1	1
Variable lease cost	7	7	14	14
Sublease income	(1)	(1)	(1)	(1)
Total operating lease costs	29	27	58	54
Total lease costs	35	33	70	65
Impairment losses and termination charges	$ 0	$ 1	$ 1	$ 2