Lease Obligations - Lessee - Lease Costs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Leases [Abstract]
Amortization of ROU assets	$ 5	$ 5	$ 15	$ 14
Interest on lease liabilities	1	1	3	4
Total finance lease costs	6	6	18	18
Operating lease cost	22	21	65	62
Short-term lease cost	1	0	2	1
Variable lease cost	7	8	22	21
Sublease income	(1)	(1)	(2)	(2)
Total operating lease costs	29	28	87	82
Total lease costs	35	34	105	100
Impairment losses and termination charges	$ 1	$ 0	$ 2	$ 2