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Debt Current Portion of Debt (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |
Current portion of debt | $ 2,477 | $ 3,388
Debt, Weighted Average Interest Rate | 5.27% | 5.15%
Commercial Paper |  |
Debt Instrument [Line Items] |  |
Current portion of debt | $ 37 | $ 433
Debt, Weighted Average Interest Rate | 1.90% | 3.10%
$500 million, 364-day credit facility due November 15, 2019 |  |
Debt Instrument [Line Items] |  |
Current portion of debt | $ 0 | $ 0
$4 billion credit facility due November 16, 2023 |  |
Debt Instrument [Line Items] |  |
Current portion of debt | 0 | 0
9.00%, due February 2019 |  |
Debt Instrument [Line Items] |  |
Current portion of debt | $ 0 | $ 500
Debt Instrument, Interest Rate, Stated Percentage |  | 9.00%
2.65%, due February 2019 |  |
Debt Instrument [Line Items] |  |
Current portion of debt | $ 0 | $ 800
Debt Instrument, Interest Rate, Stated Percentage |  | 2.65%
3.05%, due December 2019 |  |
Debt Instrument [Line Items] |  |
Current portion of debt | $ 0 | $ 1,500
Debt Instrument, Interest Rate, Stated Percentage |  | 3.05%
6.85%, due February 2020 |  |
Debt Instrument [Line Items] |  |
Current portion of debt | $ 700 | $ 0
Debt Instrument, Interest Rate, Stated Percentage | 6.85% | 6.85%
6.50%, due April 2020 |  |
Debt Instrument [Line Items] |  |
Current portion of debt | $ 535 | $ 0
Debt Instrument, Interest Rate, Stated Percentage | 6.50% | 6.50%
5.30%, due September 2020 |  |
Debt Instrument [Line Items] |  |
Current portion of debt | $ 600 | $ 0
Debt Instrument, Interest Rate, Stated Percentage | 5.30% | 5.30%
6.50%, due September 2020 |  |
Debt Instrument [Line Items] |  |
Current portion of debt | $ 349 | $ 0
Debt Instrument, Interest Rate, Stated Percentage | 6.50% | 6.50%
Trust I Preferred Securities, 4.75%, due March 2028(b) | Capital Trust I |  |
Debt Instrument [Line Items] |  |
Current portion of debt | $ 111 | $ 111
Debt Instrument, Interest Rate, Stated Percentage | 4.75% | 4.75%
KMGP, $1,000 Liquidation Value Series A Fixed-to-Floating Rate Term Cumulative Preferred Stock, due August 2057 | Kinder Morgan G.P., Inc. |  |
Debt Instrument [Line Items] |  |
Current portion of debt | $ 100 | $ 0
Other debt |  |
Debt Instrument [Line Items] |  |
Current portion of debt | $ 45 | $ 44

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