Lease Obligations - Lessee - Other Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Leases [Abstract]
Operating leases, weighted average remaining lease term	10 years 1 month 20 days		8 years 11 months 1 day
Finance leases, weighted average remaining lease term	15 years 4 months 9 days		14 years 8 months 12 days
Operating leases, weighted average discount rate	3.02%		2.88%
Finance leases, weighted average discount rate	2.90%		2.74%
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 67	$ 66
Operating cash flows from finance leases	4	3
Financing cash flows from finance leases	13	12
Gains on sale-leaseback transactions	$ 4	$ 2