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Leases (Operating and Finance Lease Liability Maturity Schedule) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Operating Leases
2021	$ 56
2022	45
2023	33
2024	25
2025	20
Thereafter	99
Total lease payments	278
Less imputed interest	(59)
Total operating lease liabilities	219
Finance Leases
2021	2
2022	2
2023	2
2024	2
2025	2
Thereafter	3
Total lease payments	13
Less imputed interest	(1)
Total finance lease liabilities	$ 12	$ 13

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