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Reportable Segments Earnings (loss) from equity investments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]      
Earnings from equity investments and amortization of excess cost of equity investments, including loss on impairments $ 367 $ (172) $ 333
Operating Segments | Natural Gas Pipelines      
Segment Reporting Information [Line Items]      
Earnings from equity investments and amortization of excess cost of equity investments, including loss on impairments 253 (269) 285
Operating Segments | CO2      
Segment Reporting Information [Line Items]      
Earnings from equity investments and amortization of excess cost of equity investments, including loss on impairments 42 22 (5)
Operating Segments | Terminals      
Segment Reporting Information [Line Items]      
Earnings from equity investments and amortization of excess cost of equity investments, including loss on impairments 24 19 17
Operating Segments | Products Pipelines      
Segment Reporting Information [Line Items]      
Earnings from equity investments and amortization of excess cost of equity investments, including loss on impairments $ 48 $ 56 $ 36