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Debt - Schedule of Debt (Details) - USD ($) $ / shares in Units, $ in Millions | Dec. 31, 2020 | Aug. 05, 2020 | Feb. 24, 2020 | Dec. 31, 2019
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Debt Instrument [Line Items] |  |  |  |
Total debt – KMI and Subsidiaries | $ 33,396 |  |  | $ 33,360
Less: Current portion of debt | 2,558 |  |  | 2,477
Total long-term debt – KMI and Subsidiaries | 30,838 |  |  | 30,883
Credit facility and commercial paper borrowings(a) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Less: Current portion of debt | $ 0 |  |  | 37
EPC Building, LLC, promissory note, 3.967%, due January 2020 through December 2035 | EPC Building LLC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 3.967% |  |  |
Total debt – KMI and Subsidiaries | $ 380 |  |  | 395
Trust I Preferred Securities, 4.75%, due March 2028(h) | Capital Trust I |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 4.75% |  |  |
Liquidation preference | $ 50 |  |  |
Total debt – KMI and Subsidiaries | $ 221 |  |  | 221
Less: Current portion of debt | 111 |  |  | $ 111
KMGP, $1,000 Liquidation Value Series A Fixed-to-Floating Rate Term Cumulative Preferred Stock, due August 2057(i) | Kinder Morgan G.P., Inc. |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Liquidation preference |  |  |  | $ 1,000
Total debt – KMI and Subsidiaries | 0 |  |  | $ 100
Less: Current portion of debt | 0 |  |  | 100
Other miscellaneous debt(j) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt – KMI and Subsidiaries | 254 |  |  | 258
Less: Current portion of debt | 47 |  |  | $ 45
Senior Notes | 6.85%, due February 2020 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage |  |  |  | 6.85%
Total debt – KMI and Subsidiaries | 0 |  |  | $ 700
Less: Current portion of debt | 0 |  |  | $ 700
Senior Notes | 6.50%, due April 2020 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage |  |  |  | 6.50%
Total debt – KMI and Subsidiaries | 0 |  |  | $ 535
Less: Current portion of debt | 0 |  |  | $ 535
Senior Notes | 5.30%, due September 2020 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage |  |  |  | 5.30%
Total debt – KMI and Subsidiaries | 0 |  |  | $ 600
Less: Current portion of debt | 0 |  |  | $ 600
Senior Notes | 6.50%, due September 2020 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage |  |  |  | 6.50%
Total debt – KMI and Subsidiaries | 0 |  |  | $ 349
Less: Current portion of debt | $ 0 |  |  | 349
Senior Notes | 5.00%, due February 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 5.00% |  |  |
Total debt – KMI and Subsidiaries | $ 750 |  |  | 750
Less: Current portion of debt | $ 750 |  |  | 0
Senior Notes | 3.50%, due March 2021(c) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 3.50% |  |  |
Total debt – KMI and Subsidiaries | $ 750 |  |  | 750
Less: Current portion of debt | $ 750 |  |  | 0
Senior Notes | 5.80%, due March 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 5.80% |  |  |
Total debt – KMI and Subsidiaries | $ 400 |  |  | 400
Less: Current portion of debt | $ 400 |  |  | 0
Senior Notes | 5.00%, due October 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 5.00% |  |  |
Total debt – KMI and Subsidiaries | $ 500 |  |  | 500
Less: Current portion of debt | $ 500 |  |  | 0
Senior Notes | 4.15%, due March 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 4.15% |  |  |
Total debt – KMI and Subsidiaries | $ 375 |  |  | 375
Senior Notes | 1.50%, due March 2022(d) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 1.50% |  |  |
Total debt – KMI and Subsidiaries | $ 917 |  |  | 841
Senior Notes | 3.95%, due September 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 3.95% |  |  |
Total debt – KMI and Subsidiaries | $ 1,000 |  |  | 1,000
Senior Notes | 3.15%, due January 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 3.15% |  |  |
Total debt – KMI and Subsidiaries | $ 1,000 |  |  | 1,000
Senior Notes | Floating rate, due January 2023(e) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt – KMI and Subsidiaries | $ 250 |  |  | 250
Senior Notes | 3.45%, due February 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 3.45% |  |  |
Total debt – KMI and Subsidiaries | $ 625 |  |  | 625
Senior Notes | 3.50%, due September 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 3.50% |  |  |
Total debt – KMI and Subsidiaries | $ 600 |  |  | 600
Senior Notes | 5.625%, due November 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 5.625% |  |  |
Total debt – KMI and Subsidiaries | $ 750 |  |  | 750
Senior Notes | 4.15%, due February 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 4.15% |  |  |
Total debt – KMI and Subsidiaries | $ 650 |  |  | 650
Senior Notes | 4.30%, due May 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 4.30% |  |  |
Total debt – KMI and Subsidiaries | $ 600 |  |  | 600
Senior Notes | 4.25%, due September 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 4.25% |  |  |
Total debt – KMI and Subsidiaries | $ 650 |  |  | 650
Senior Notes | 4.30%, due June 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 4.30% |  |  |
Total debt – KMI and Subsidiaries | $ 1,500 |  |  | 1,500
Senior Notes | 6.70%, due February 2027 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 6.70% |  |  |
Total debt – KMI and Subsidiaries | $ 7 |  |  | 7
Senior Notes | 2.25%, due March 2027(d) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 2.25% |  |  |
Total debt – KMI and Subsidiaries | $ 611 |  |  | 561
Senior Notes | 6.67%, due November 2027 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 6.67% |  |  |
Total debt – KMI and Subsidiaries | $ 7 |  |  | 7
Senior Notes | 4.30%, due March 2028 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 4.30% |  |  |
Total debt – KMI and Subsidiaries | $ 1,250 |  |  | 1,250
Senior Notes | 7.25%, due March 2028 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 7.25% |  |  |
Total debt – KMI and Subsidiaries | $ 32 |  |  | 32
Senior Notes | 6.95%, due June 2028 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 6.95% |  |  |
Total debt – KMI and Subsidiaries | $ 31 |  |  | 31
Senior Notes | 8.05%, due October 2030 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 8.05% |  |  |
Total debt – KMI and Subsidiaries | $ 234 |  |  | 234
Senior Notes | 2.00%, due February 2031(f) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 2.00% | 2.00% |  |
Total debt – KMI and Subsidiaries | $ 750 | $ 750 |  | 0
Senior Notes | 7.40%, due March 2031 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 7.40% |  |  |
Total debt – KMI and Subsidiaries | $ 300 |  |  | 300
Senior Notes | 7.80%, due August 2031 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 7.80% |  |  |
Total debt – KMI and Subsidiaries | $ 537 |  |  | 537
Senior Notes | 7.75%, due January 2032 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 7.75% |  |  |
Total debt – KMI and Subsidiaries | $ 1,005 |  |  | 1,005
Senior Notes | 7.75%, due March 2032 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 7.75% |  |  |
Total debt – KMI and Subsidiaries | $ 300 |  |  | 300
Senior Notes | 7.30%, due August 2033 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 7.30% |  |  |
Total debt – KMI and Subsidiaries | $ 500 |  |  | 500
Senior Notes | 5.30%, due December 2034 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 5.30% |  |  |
Total debt – KMI and Subsidiaries | $ 750 |  |  | 750
Senior Notes | 5.80%, due March 2035 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 5.80% |  |  |
Total debt – KMI and Subsidiaries | $ 500 |  |  | 500
Senior Notes | 7.75%, due October 2035 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 7.75% |  |  |
Total debt – KMI and Subsidiaries | $ 1 |  |  | 1
Senior Notes | 6.40%, due January 2036 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 6.40% |  |  |
Total debt – KMI and Subsidiaries | $ 36 |  |  | 36
Senior Notes | 6.50%, due February 2037 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 6.50% |  |  |
Total debt – KMI and Subsidiaries | $ 400 |  |  | 400
Senior Notes | 7.42%, due February 2037 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 7.42% |  |  |
Total debt – KMI and Subsidiaries | $ 47 |  |  | 47
Senior Notes | 6.95%, due January 2038 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 6.95% |  |  |
Total debt – KMI and Subsidiaries | $ 1,175 |  |  | 1,175
Senior Notes | 6.50%, due September 2039 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 6.50% |  |  |
Total debt – KMI and Subsidiaries | $ 600 |  |  | 600
Senior Notes | 6.55%, due September 2040 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 6.55% |  |  |
Total debt – KMI and Subsidiaries | $ 400 |  |  | 400
Senior Notes | 7.50%, due November 2040 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 7.50% |  |  |
Total debt – KMI and Subsidiaries | $ 375 |  |  | 375
Senior Notes | 6.375%, due March 2041 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 6.375% |  |  |
Total debt – KMI and Subsidiaries | $ 600 |  |  | 600
Senior Notes | 5.625%, due September 2041 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 5.625% |  |  |
Total debt – KMI and Subsidiaries | $ 375 |  |  | 375
Senior Notes | 5.00%, due August 2042 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 5.00% |  |  |
Total debt – KMI and Subsidiaries | $ 625 |  |  | 625
Senior Notes | 4.70%, due November 2042 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 4.70% |  |  |
Total debt – KMI and Subsidiaries | $ 475 |  |  | 475
Senior Notes | 5.00%, due March 2043 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 5.00% |  |  |
Total debt – KMI and Subsidiaries | $ 700 |  |  | 700
Senior Notes | 5.50%, due March 2044 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 5.50% |  |  |
Total debt – KMI and Subsidiaries | $ 750 |  |  | 750
Senior Notes | 5.40%, due September 2044 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 5.40% |  |  |
Total debt – KMI and Subsidiaries | $ 550 |  |  | 550
Senior Notes | 5.55%, due June 2045 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 5.55% |  |  |
Total debt – KMI and Subsidiaries | $ 1,750 |  |  | 1,750
Senior Notes | 5.05%, due February 2046 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 5.05% |  |  |
Total debt – KMI and Subsidiaries | $ 800 |  |  | 800
Senior Notes | 5.20%, due March 2048 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 5.20% |  |  |
Total debt – KMI and Subsidiaries | $ 750 |  |  | 750
Senior Notes | 3.25%, due August 2050(f) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 3.25% | 3.25% |  |
Total debt – KMI and Subsidiaries | $ 500 | $ 500 |  | 0
Senior Notes | 7.45%, due March 2098 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 7.45% |  |  |
Total debt – KMI and Subsidiaries | $ 26 |  |  | 26
Senior Notes | 7.00%, due March 2027 | TGP |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 7.00% |  |  |
Total debt – KMI and Subsidiaries | $ 300 |  |  | 300
Senior Notes | 7.00%, due October 2028 | TGP |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 7.00% |  |  |
Total debt – KMI and Subsidiaries | $ 400 |  |  | 400
Senior Notes | 2.90%, due March 2030(g) | TGP |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 2.90% |  | 2.90% |
Total debt – KMI and Subsidiaries | $ 1,000 |  | $ 1,000 | 0
Senior Notes | 8.375%, due June 2032 | TGP |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 8.375% |  |  |
Total debt – KMI and Subsidiaries | $ 240 |  |  | 240
Senior Notes | 7.625%, due April 2037 | TGP |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 7.625% |  |  |
Total debt – KMI and Subsidiaries | $ 300 |  |  | 300
Senior Notes | 8.625%, due January 2022 | EPNG |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 8.625% |  |  |
Total debt – KMI and Subsidiaries | $ 260 |  |  | 260
Senior Notes | 7.50%, due November 2026 | EPNG |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 7.50% |  |  |
Total debt – KMI and Subsidiaries | $ 200 |  |  | 200
Senior Notes | 8.375%, due June 2032 | EPNG |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 8.375% |  |  |
Total debt – KMI and Subsidiaries | $ 300 |  |  | 300
Senior Notes | 4.15%, due August 2026 | CIG |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 4.15% |  |  |
Total debt – KMI and Subsidiaries | $ 375 |  |  | 375
Senior Notes | 6.85%, due June 2037 | CIG |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 6.85% |  |  |
Total debt – KMI and Subsidiaries | $ 100 |  |  | $ 100

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