Lease Obligations - Lessee - Lease Costs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Leases [Abstract]
Amortization of ROU assets	$ 5	$ 4	$ 9	$ 9
Interest on lease liabilities	1	1	2	2
Total finance lease costs	6	5	11	11
Operating lease cost	21	19	40	39
Short-term lease cost	0	0	1	1
Variable lease cost	7	8	14	16
Sublease income	(1)	0	(1)	(1)
Total operating lease costs	27	27	54	55
Total lease costs	33	32	65	66
Impairment losses and termination charges	$ 1	$ 2	$ 2	$ 2