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Debt - Schedule of Debt (Details) - USD ($)
$ in Millions
Jul. 31, 2024
Feb. 01, 2024
Dec. 31, 2024
Dec. 31, 2023
Debt Instrument [Line Items]        
Total debt – KMI and Subsidiaries     $ 31,788 $ 31,929
Less: Current portion of debt     2,009 4,049
Total long-term debt – KMI and Subsidiaries(f)     29,779 27,880
Commercial paper notes        
Debt Instrument [Line Items]        
Less: Current portion of debt     $ 331 $ 1,989
Weighted average interest rate     4.60% 5.68%
Credit facility and commercial paper borrowings(a)        
Debt Instrument [Line Items]        
Less: Current portion of debt     $ 331 $ 1,989
EPC Building, LLC, promissory note, 3.967%, due January 2023 through December 2035 | EPC Building LLC        
Debt Instrument [Line Items]        
Interest rate, stated percentage     3.967%  
Total debt – KMI and Subsidiaries     $ 310 330
Trust I Preferred Securities, 4.75%, due March 2028(d) | Capital Trust I        
Debt Instrument [Line Items]        
Interest rate, stated percentage     4.75%  
Total debt – KMI and Subsidiaries     $ 221 221
Less: Current portion of debt     111 111
Other miscellaneous debt(e)        
Debt Instrument [Line Items]        
Total debt – KMI and Subsidiaries     205 234
Less: Current portion of debt     67 $ 49
Senior Notes        
Debt Instrument [Line Items]        
Proceeds from debt, net $ 1,235 $ 2,230    
Senior Notes | 4.15%, due February 2024        
Debt Instrument [Line Items]        
Interest rate, stated percentage       4.15%
Total debt – KMI and Subsidiaries     0 $ 650
Less: Current portion of debt     0 $ 650
Senior Notes | 4.30%, due May 2024        
Debt Instrument [Line Items]        
Interest rate, stated percentage       4.30%
Total debt – KMI and Subsidiaries     0 $ 600
Less: Current portion of debt     0 $ 600
Senior Notes | 4.25%, due September 2024        
Debt Instrument [Line Items]        
Interest rate, stated percentage       4.25%
Total debt – KMI and Subsidiaries     0 $ 650
Less: Current portion of debt     $ 0 650
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
Less: Current portion of debt     $ 1,500 0
Senior Notes | 1.75%, due November 2026        
Debt Instrument [Line Items]        
Interest rate, stated percentage     1.75%  
Total debt – KMI and Subsidiaries     $ 500 500
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(c)        
Debt Instrument [Line Items]        
Interest rate, stated percentage     2.25%  
Total debt – KMI and Subsidiaries     $ 518 552
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 | 5.00%, due February 2029        
Debt Instrument [Line Items]        
Interest rate, stated percentage   5.00% 5.00%  
Total debt – KMI and Subsidiaries   $ 1,250 $ 1,250 0
Senior Notes | 5.10% due August 2029        
Debt Instrument [Line Items]        
Interest rate, stated percentage 5.10%   5.10%  
Total debt – KMI and Subsidiaries $ 500   $ 500 0
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        
Debt Instrument [Line Items]        
Interest rate, stated percentage     2.00%  
Total debt – KMI and Subsidiaries     $ 750 750
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 | 4.80%, due February 2033        
Debt Instrument [Line Items]        
Interest rate, stated percentage     4.80%  
Total debt – KMI and Subsidiaries     $ 750 750
Senior Notes | 5.20%, due June 2033        
Debt Instrument [Line Items]        
Interest rate, stated percentage     5.20%  
Total debt – KMI and Subsidiaries     $ 1,500 1,500
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 | 5.40%, due February 2034        
Debt Instrument [Line Items]        
Interest rate, stated percentage   5.40% 5.40%  
Total debt – KMI and Subsidiaries   $ 1,000 $ 1,000 0
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        
Debt Instrument [Line Items]        
Interest rate, stated percentage     3.25%  
Total debt – KMI and Subsidiaries     $ 500 500
Senior Notes | 3.60%, due February 2051        
Debt Instrument [Line Items]        
Interest rate, stated percentage     3.60%  
Total debt – KMI and Subsidiaries     $ 1,050 1,050
Senior Notes | 5.45%, due August 2052        
Debt Instrument [Line Items]        
Interest rate, stated percentage     5.45%  
Total debt – KMI and Subsidiaries     $ 750 750
Senior Notes | 5.95% due August 2054        
Debt Instrument [Line Items]        
Interest rate, stated percentage 5.95%   5.95%  
Total debt – KMI and Subsidiaries $ 750   $ 750 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 | TGP        
Debt Instrument [Line Items]        
Interest rate, stated percentage     2.90%  
Total debt – KMI and Subsidiaries     $ 1,000 1,000
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 | 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 | 3.50%, due February 2032 | EPNG        
Debt Instrument [Line Items]        
Interest rate, stated percentage     3.50%  
Total debt – KMI and Subsidiaries     $ 300 300
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