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Divestitures - Sale of Trans Mountain Pipeline System and ts Expansion Project (Details) $ in Millions, $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 03, 2019 USD ($) | Jan. 03, 2019 CAD ($) | Feb. 28, 2019 USD ($) | Mar. 31, 2019 USD ($) | Mar. 31, 2019 CAD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 16, 2019 | Aug. 31, 2018 USD ($) | Aug. 31, 2018 CAD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss (gain) on divestitures and impairments, net |  |  |  |  |  | $ 1,932 | $ (942) | $ 167 |  |  |
Settlement of working capital adjustments |  |  |  |  |  | 0 | 28 |  |  |  |
Payments to noncontrolling interests | $ 900 | $ 1,200 |  |  |  | 0 | 879 | 0 |  |  |
Proceeds from the TMPL Sale, net of cash disposed and working capital adjustments |  |  |  |  |  |  |  | 2,998 |  |  |
Repayments of commercial paper | 400 |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  | $ 3,996 | $ 11,224 | 14,591 |  |  |
Trans Mountain and Trans Mountain Expansion Project |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consideration |  |  |  |  |  |  |  |  |  | $ 3,400 | $ 4,430
Contractual purchase price |  |  |  |  |  |  |  |  |  |  | $ 4,500
Loss (gain) on divestitures and impairments, net |  |  |  |  |  |  |  | $ (595) |  |  |
Settlement of working capital adjustments |  |  |  | $ 28 | $ 37 |  |  |  |  |  |
Kinder Morgan, Inc. |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from the TMPL Sale, net of cash disposed and working capital adjustments | $ 1,900 | $ 2,500 |  |  |  |  |  |  |  |  |
Repayments of debt |  |  | $ 1,300 |  |  |  |  |  |  |  |
Kinder Morgan Canada Limited |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership percentage | 70.00% | 70.00% |  |  |  |  |  |  | 70.00% |  |

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