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Leases - Maturity of Lease Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Operating leases
2022	$ 285
2023	249
2024	221
2025	184
2026	176
Thereafter	680
Total lease payments	1,795
Less imputed interest	(241)
Total lease obligations	1,554
Less current obligations	(239)	$ (306)
Operating	1,315	1,562
Finance leases
2022	98
2023	94
2024	90
2025	74
2026	54
Thereafter	102
Total lease payments	512
Less imputed interest	(53)
Total lease obligations	459	542
Less current obligations	(82)	(83)
Finance	$ 377	$ 459

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