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Reportable Segments Earnings (loss) from equity investments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]      
Earnings from equity investments and amortization of excess cost of equity investments, including loss on impairments $ 522 $ 367 $ (172)
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 391 253 (269)
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 75 48 56
Operating Segments | Terminals      
Segment Reporting Information [Line Items]      
Earnings from equity investments and amortization of excess cost of equity investments, including loss on impairments 22 24 19
Operating Segments | CO2      
Segment Reporting Information [Line Items]      
Earnings from equity investments and amortization of excess cost of equity investments, including loss on impairments $ 34 $ 42 $ 22