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Investments Equity Earnings (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net Investment Income [Line Items]      
Income (Loss) from Equity Method Investments $ 887 $ 578 $ 497
Amortization of excess costs (95) (61) (59)
Gulf LNG Holdings Group LLC      
Net Investment Income [Line Items]      
Income (Loss) from Equity Method Investments 209 47 48
Citrus Corporation      
Net Investment Income [Line Items]      
Income (Loss) from Equity Method Investments 169 108 102
SNG      
Net Investment Income [Line Items]      
Income (Loss) from Equity Method Investments 141 77 58
NGPL Holdco LLC      
Net Investment Income [Line Items]      
Income (Loss) from Equity Method Investments 66 10 12
FEP      
Net Investment Income [Line Items]      
Income (Loss) from Equity Method Investments 55 53 51
Plantation Pipe Line Company      
Net Investment Income [Line Items]      
Income (Loss) from Equity Method Investments 55 46 37
Cortez Pipeline Company      
Net Investment Income [Line Items]      
Impairment at equity investee, other than temporary   (4) 9
Income (Loss) from Equity Method Investments 36 44 24
MEP      
Net Investment Income [Line Items]      
Income (Loss) from Equity Method Investments 31 38 40
Ruby      
Net Investment Income [Line Items]      
Income (Loss) from Equity Method Investments 26 44 15
Watco Companies LLC      
Net Investment Income [Line Items]      
Income (Loss) from Equity Method Investments 21 19 25
Red Cedar Gathering company      
Net Investment Income [Line Items]      
Impairment at equity investee, other than temporary   10  
Income (Loss) from Equity Method Investments 18 14 24
Utopia Holding L.L.C.      
Net Investment Income [Line Items]      
Income (Loss) from Equity Method Investments 14 0 0
Double Eagle Pipeline LLC      
Net Investment Income [Line Items]      
Income (Loss) from Equity Method Investments 10 7 5
Bear Creek Storage      
Net Investment Income [Line Items]      
Income (Loss) from Equity Method Investments 9 8 2
EagleHawk      
Net Investment Income [Line Items]      
Income (Loss) from Equity Method Investments 7 24 10
Liberty Pipeline Group LLC      
Net Investment Income [Line Items]      
Income (Loss) from Equity Method Investments 7 9 11
Sierrita Pipeline LLC      
Net Investment Income [Line Items]      
Income (Loss) from Equity Method Investments 7 7 7
Gulf Coast Express LLC      
Net Investment Income [Line Items]      
Income (Loss) from Equity Method Investments 2 0 0
All others      
Net Investment Income [Line Items]      
Income (Loss) from Equity Method Investments $ 4 $ 23 $ 26