Lease Obligations - Lessee - Other Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Leases [Abstract]
Operating leases, weighted average remaining lease term	11 years 21 days		11 years 25 days
Finance leases, weighted average remaining lease term	12 years 10 months 2 days		15 years 2 months 15 days
Operating leases, weighted average discount rate	3.80%		3.72%
Finance leases, weighted average discount rate	3.82%		3.02%
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 23	$ 23
Operating cash flows from finance leases	1	1
Financing cash flows from finance leases	5	4
Gains on sale-leaseback transactions	$ 0	$ 1