Reportable Segments Investments (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Investments	$ 7,578	$ 7,917
Operating Segments | Natural Gas Pipelines
Segment Reporting Information [Line Items]
Investments	6,887	7,262
Operating Segments | Products Pipelines
Segment Reporting Information [Line Items]
Investments	465	494
Operating Segments | Terminals
Segment Reporting Information [Line Items]
Investments	137	136
Operating Segments | CO2
Segment Reporting Information [Line Items]
Investments	$ 89	$ 25