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Reportable Segments Earnings (loss) from equity investments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]      
Earnings from equity investments and amortization of excess cost of equity investments, including loss on impairments $ 333 $ 361 $ 288
Natural Gas Pipelines      
Segment Reporting Information [Line Items]      
Earnings from equity investments and amortization of excess cost of equity investments, including loss on impairments 285 279 200
CO2      
Segment Reporting Information [Line Items]      
Earnings from equity investments and amortization of excess cost of equity investments, including loss on impairments (5) 26 22
Terminals      
Segment Reporting Information [Line Items]      
Earnings from equity investments and amortization of excess cost of equity investments, including loss on impairments 17 18 22
Products Pipelines      
Segment Reporting Information [Line Items]      
Earnings from equity investments and amortization of excess cost of equity investments, including loss on impairments 36 37 40
Kinder Morgan Canada      
Segment Reporting Information [Line Items]      
Earnings from equity investments and amortization of excess cost of equity investments, including loss on impairments 0 0 4
Other      
Segment Reporting Information [Line Items]      
Earnings from equity investments and amortization of excess cost of equity investments, including loss on impairments $ 0 $ 1 $ 0