Lease Obligations - Lessee - Other Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Operating leases, weighted average remaining lease term	11 years 25 days	10 years 9 months 18 days
Finance leases, weighted average remaining lease term	15 years 2 months 15 days	15 years 3 months 21 days
Operating leases, weighted average discount rate	3.72%	3.35%
Finance leases, weighted average discount rate	3.02%	2.94%
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 91	$ 90	$ 88
Operating cash flows from finance leases	5	5	4
Financing cash flows from finance leases	16	23	16
Gains on sale-leaseback transactions	$ 2	$ 4	$ 2