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Reportable Segments Earnings (loss) from equity investments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Earnings (loss) from equity investments and amortization of excess cost of equity investments, including loss on impairments of equity investments $ 640 $ 18 $ 522
Operating Segments | Natural Gas Pipelines      
Segment Reporting Information [Line Items]      
Earnings (loss) from equity investments and amortization of excess cost of equity investments, including loss on impairments of equity investments 551 (101) 410
Operating Segments | Products Pipelines      
Segment Reporting Information [Line Items]      
Earnings (loss) from equity investments and amortization of excess cost of equity investments, including loss on impairments of equity investments 45 63 56
Operating Segments | Terminals      
Segment Reporting Information [Line Items]      
Earnings (loss) from equity investments and amortization of excess cost of equity investments, including loss on impairments of equity investments 22 23 22
Operating Segments | CO2      
Segment Reporting Information [Line Items]      
Earnings (loss) from equity investments and amortization of excess cost of equity investments, including loss on impairments of equity investments $ 22 $ 33 $ 34