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Leases - Lease Commitments (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Operating Leases
2021	$ 160
2022	151
2023	141
2024	119
2025	82
Thereafter	493
Total minimum lease payments	1,146
Less: amount of lease payment representing interest	(281)
Present value of future minimum lease payment	865
Less: current obligations under leases	(113)	$ (128)
Operating lease liabilities	752	690
Finance Leases
2021	40
2022	11
2023	11
2024	5
2025	0
Thereafter	0
Total minimum lease payments	67
Less: amount of lease payment representing interest	(4)
Present value of future minimum lease payment	63	89
Less: current obligations under leases	(37)	(31)
Finance lease liabilities	$ 26	$ 58

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