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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