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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Future Minimum Rental Payments
Future Minimum Rental Payments

Year
 
(in millions)
2018
$
8

2019
9

2020
9

2021
8

2022
9

Thereafter
80

Total
$
123