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Leases - Future Maturities of Lease Liabilities (Details) $ in Millions	Mar. 31, 2019 USD ($)
Operating Leases
2019 (excluding the three-months ended March 31, 2019)	$ 41
2020	50
2021	43
2022	34
2023	23
Thereafter	122
Total lease payments	313
Less: imputed interest	(63)
Total	250
Finance Leases
2019 (excluding the three-months ended March 31, 2019)	8
2020	3
2021	3
2022	3
2023	4
Thereafter	23
Total lease payments	44
Less: imputed interest	(7)
Total	$ 37

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