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Reportable Segments Capital expenditures (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | $ 1,707 | $ 2,270 | $ 2,904
Operating Segments | Natural Gas Pipelines |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | 945 | 1,377 | 1,565
Operating Segments | Products Pipelines |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | 122 | 175 | 199
Operating Segments | Terminals |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | 433 | 347 | 386
Operating Segments | CO2 |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | 186 | 349 | 397
Operating Segments | Kinder Morgan Canada |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | 0 | 0 | 332
Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | $ 21 | $ 22 | $ 25

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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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