Lease Obligations - Lessee - Other Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Leases [Abstract]
Operating leases, weighted average remaining lease term	11 years 5 months 19 days		11 years 25 days
Finance leases, weighted average remaining lease term	12 years 8 months 8 days		15 years 2 months 15 days
Operating leases, weighted average discount rate	4.05%		3.72%
Finance leases, weighted average discount rate	3.78%		3.02%
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 71	$ 68
Operating cash flows from finance leases	4	3
Financing cash flows from finance leases	14	12
Gains on sale-leaseback transactions	$ 0	$ 1