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Leases - Maturity of Lease Liabilities (Details) $ in Millions	Mar. 31, 2019 USD ($)
Operating
Remainder of 2019	$ 92
2020	108
2021	89
2022	75
2023	52
Thereafter	244
Total	660
Less: Present value discount	(173)
Lease liabilities	487
Finance
Remainder of 2019	15
2020	16
2021	7
2022	7
2023	5
Thereafter	7
Total	57
Less: Present value discount	(2)
Lease liabilities	$ 55

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