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Equity Method Investments (Tables)
12 Months Ended
Dec. 31, 2020
Equity Method Investments and Joint Ventures [Abstract]  
Schedule of equity method investments
(in millions)Enable JVMidway JVTotal
Balance at December 31, 201878 84 
Cash Distributions(4)(9)(13)
Equity income 10 
Balance at December 31, 201975 81 
Cash Distributions(4)(6)(10)
Equity income4 5 9 
Balance at December 31, 2020$6 $74 $80