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Leases - Lease Maturities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Operating
2021	$ 29
2022	20
2023	16
2024	10
2025	6
Thereafter	3
Subtotal - undiscounted lease payments	84
Less imputed interest	(8)
Total operating lease liabilities	76	$ 73
Finance
2021	26
2022	24
2023	22
2024	22
2025	23
Thereafter	266
Subtotal - undiscounted lease payments	383
Less imputed interest	(146)
Total finance lease liabilities	$ 237	$ 239

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