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Leases - Lease Maturities (Details) $ in Millions	Mar. 31, 2019 USD ($)
Operating Leases
2019	$ 27
2020	28
2021	18
2022	12
2023	9
Thereafter	9
Total lease payments	103
Less imputed interest	(10)
Total operating lease liabilities	93
Finance Leases
2019	16
2020	22
2021	22
2022	21
2023	21
Thereafter	311
Total lease payments	413
Less imputed interest	(172)
Total finance lease liabilities	$ 241

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