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Debt Debt Outstanding (Details) - USD ($) shares in Millions |  |  | 1 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 24, 2020 | Jan. 09, 2020 | Apr. 30, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |  |  |  |
Current portion of debt |  |  |  | $ 3,006,000,000 |  | $ 2,477,000,000
Total long-term debt |  |  |  | 29,976,000,000 |  | 30,883,000,000
Total debt(e) |  |  |  | 32,982,000,000 |  | 33,360,000,000
Debt fair value adjustments |  |  |  | 1,465,000,000 |  | 1,032,000,000
Proceeds from issuances of debt |  |  |  | 2,652,000,000 | $ 3,042,000,000 |
Proceeds from Sale and Maturity of Marketable Securities |  | $ 907,000,000 |  |  |  |
Proceeds From Sale And Maturity Of Marketable Securities After Taxes |  | $ 764,000,000 |  |  |  |
Marketable securities at fair value |  |  |  | 0 |  | 925,000,000
Repayments of debt |  |  |  | 3,037,000,000 | $ 4,622,000,000 |
Commercial paper notes(a) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Current portion of debt |  |  |  | 0 |  | $ 37,000,000
Debt, Weighted Average Interest Rate |  |  |  |  |  | 1.90%
Current portion of other debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Current portion of debt |  |  |  | 46,000,000 |  | $ 45,000,000
6.85%, due February 2020 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Current portion of debt |  |  |  | 0 |  | $ 700,000,000
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 6.85%
6.50%, due April 2020 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Current portion of debt |  |  |  | 0 |  | $ 535,000,000
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 6.50%
5.30%, due September 2020 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Current portion of debt |  |  |  | $ 600,000,000 |  | $ 600,000,000
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 5.30% |  | 5.30%
6.50%, due September 2020 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Current portion of debt |  |  |  | $ 349,000,000 |  | $ 349,000,000
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 6.50% |  | 6.50%
5.00%, due February 2021 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Current portion of debt |  |  |  | $ 750,000,000 |  | $ 0
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 5.00% |  | 5.00%
3.50%, due March 2021 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Current portion of debt |  |  |  | $ 750,000,000 |  | $ 0
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 3.50% |  | 3.50%
5.80%, Due March 2021 Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Current portion of debt |  |  |  | $ 400,000,000 |  | $ 0
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 5.80% |  | 5.80%
Other |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total long-term debt |  |  |  | $ 226,000,000 |  | $ 228,000,000
$4 billion credit facility due November 16, 2023 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Current portion of debt |  |  |  | 0 |  | 0
Line of Credit Facility, Current Borrowing Capacity |  |  |  | 4,000,000,000.0 |  |
Senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total long-term debt |  |  |  | 29,267,000,000 |  | 30,164,000,000
Senior notes | 6.50%, due April 2020 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayments of debt |  |  | $ 535,000,000 |  |  |
Capital Trust I | Trust I preferred securities, 4.75%, due March 2028 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Current portion of debt |  |  |  | 111,000,000 |  | 111,000,000
Total long-term debt |  |  |  | $ 110,000,000 |  | $ 110,000,000
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 4.75% |  | 4.75%
Kinder Morgan G.P., Inc. | KMI $1,000 Liquidation Value Series A Fixed-to-Floating Rate Term Cumulative Preferred Stock |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Current portion of debt |  |  |  | $ 0 |  | $ 100,000,000
Preferred Stock, Liquidation Preference, Value |  |  |  |  |  | 1,000
EPC Building LLC | EPC Building, LLC, promissory note, 3.967%, due 2020 through 2035 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total long-term debt |  |  |  | $ 373,000,000 |  | $ 381,000,000
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 3.967% |  | 3.967%
TGP | Senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total long-term debt | $ 1,000,000,000 |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.90% |  |  |  |  |
Proceeds from issuances of debt | $ 991,000,000 |  |  |  |  |
Kinder Morgan Canada Limited |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Aggregate Shares |  | 25 |  |  |  |

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