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Commitments and Contingencies (Future Minimum Commitments) (Details) $ in Millions	Dec. 31, 2018 USD ($)
Capital Lease Obligations
2018	$ 2
2019	5
2020	0
2021	0
2022	0
Later years	0
Total minimum lease payments	7
Less: imputed interest costs	1
Present value of net minimum lease payments	6
Operating Lease Obligations
2018	73
2019	70
2020	67
2021	64
2022	58
Later years	719
Total minimum lease payments	$ 1,051

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