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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
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