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Lease Commitments - ASC 842 (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Operating Leases
2021	$ 1,376
2022	779
2023	497
2024	338
2025	255
Thereafter	1,112
Total	4,357
Less: Amounts representing interest	451
Total lease liabilities	3,906	$ 3,885
Finance Leases
2021	204
2022	60
2023	58
2024	56
2025	53
Thereafter	331
Total	762
Less: Amounts representing interest	129
Total lease liabilities	$ 633	$ 300

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