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Equity Method Investments (Tables)
 12 Months Ended
Dec. 31, 2018
Equity Method Investments and Joint Ventures [Abstract]  
Schedule of equity method investments
(in millions)
Enable JV
 
Midway JV
 
Total
Balance at December 31, 2016
6

—

—

 
6

Contributions
1

—

76

 
77

Cash Distributions
(1
)
 
—

 
(1
)
Equity income
—

—

1

 
1

Balance at December 31, 2017
6

 
77

 
83

Cash Distributions
(2
)
 
(5
)
 
(7
)
Equity income
2

 
6

 
8

Balance at December 31, 2018
$
6

 
$
78

 
$
84