Lease Obligations - Lessee - Lease Costs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Leases [Abstract]
Amortization of ROU assets	$ 5	$ 5	$ 16	$ 15
Interest on lease liabilities	2	1	4	3
Total finance lease costs	7	6	20	18
Operating lease cost	23	22	66	65
Short-term lease cost	0	1	1	2
Variable lease cost	7	7	21	22
Sublease income	(1)	(1)	(2)	(2)
Total operating lease costs	29	29	86	87
Total lease costs	36	35	106	105
Impairment losses and termination charges	$ 0	$ 1	$ 0	$ 2