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Leases - Maturities of Lease Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Operating Leases
2021	$ 203
2022	155
2023	107
2024	72
2025	51
Thereafter	169
Total future undiscounted lease payments	757
Less imputed interest	(97)
Total operating lease liabilities	660	$ 581
Finance Leases
2021	81
2022	71
2023	51
2024	33
2025	18
Thereafter	22
Total future undiscounted lease payments	276
Less imputed interest	(20)
Total finance lease liabilities	$ 256	$ 123

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