Leases Lease Liabilities Maturities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2021	$ 64	$ 55
2022	51	50
2023	43	42
2024	32	35
2025	27	24
Thereafter	58	63
Total lease payments	275	269
Less: Interest	(21)	(26)
Total	$ 254	$ 243
Operating lease, weighted-average remaining lease term	5 years 9 months 18 days	6 years 1 month 6 days
Operating lease, weighted-average discount rate, percent	2.60%	3.00%
Finance Lease, Liability, Payment, Due [Abstract]
2021	$ 9	$ 14
2022	10	10
2023	10	10
2024	10	10
2025	9	10
Thereafter	0	9
Total lease payments	48	63
Less: Interest	(4)	(6)
Total	$ 44	$ 57
Finance lease, weighted-average remaining lease term	4 years 9 months 18 days	5 years 9 months 18 days
Finance lease, weighted-average discount rate, percent	3.40%	3.40%