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Commitments and Contingencies (Tables)
3 Months Ended
Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Other Commitments
At March 31, 2018, payments under these contracts were estimated as follows:
Year Ending December 31,
 
Commitments
 
 
(millions)
Remainder of 2018
 
$
33

2019
 
36

2020
 
36

2021
 
37

2022
 
37

Thereafter
 
575

Total estimated payments
 
$
754