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Reportable Segments Earnings (loss) from equity investments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]      
Earnings from equity investments and amortization of excess cost of equity investments $ 772 $ 728 $ 513
Operating Segments | Natural Gas Pipelines      
Segment Reporting Information [Line Items]      
Earnings from equity investments and amortization of excess cost of equity investments 746 650 435
Operating Segments | Products Pipelines      
Segment Reporting Information [Line Items]      
Earnings from equity investments and amortization of excess cost of equity investments (6) 33 34
Operating Segments | Terminals      
Segment Reporting Information [Line Items]      
Earnings from equity investments and amortization of excess cost of equity investments 9 14 15
Operating Segments | CO2      
Segment Reporting Information [Line Items]      
Earnings from equity investments and amortization of excess cost of equity investments $ 23 $ 31 $ 29