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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Statement of Comprehensive Income [Abstract]        
Net income $ 894 $ 742 $ 1,895 $ 1,485
Other comprehensive income (loss), net of tax        
Net unrealized gain (loss) from derivative instruments (net of taxes of $(10), $(40), $46, and $(37), respectively) 39 130 (160) 123
Reclassification into earnings of net derivative instruments loss (gain) to net income (net of taxes of $(15), $15, $(21), and $16, respectively) 51 (44) 71 (49)
Benefit plan adjustments (net of taxes of $1, $1, $2, and $1, respectively) (3) (1) (6) (3)
Total other comprehensive income (loss) 87 85 (95) 71
Comprehensive income 981 827 1,800 1,556
Comprehensive income attributable to noncontrolling interests (27) (27) (52) (53)
Comprehensive income attributable to KMI $ 954 $ 800 $ 1,748 $ 1,503