Reportable Segments Investments (Details) - USD ($) $ in Millions |
Dec. 31, 2018 |
Dec. 31, 2017 |
---|---|---|
Segment Reporting Information [Line Items] | ||
Investments | $ 7,481 | $ 7,298 |
Operating Segments | Natural Gas Pipelines | ||
Segment Reporting Information [Line Items] | ||
Investments | 6,358 | 6,218 |
Operating Segments | Products Pipelines | ||
Segment Reporting Information [Line Items] | ||
Investments | 839 | 777 |
Operating Segments | Terminals | ||
Segment Reporting Information [Line Items] | ||
Investments | 268 | 263 |
Operating Segments | CO2 | ||
Segment Reporting Information [Line Items] | ||
Investments | 16 | 6 |
Operating Segments | Kinder Morgan Canada | ||
Segment Reporting Information [Line Items] | ||
Investments | $ 0 | $ 34 |