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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Statement of Comprehensive Income [Abstract]        
Net income $ 790 $ 654 $ 2,685 $ 2,139
Other comprehensive (loss) income, net of tax        
Net unrealized (loss) gain from derivative instruments (net of taxes of $41, $(7), $87, and $(44), respectively) (148) 22 (308) 145
Reclassification into earnings of net derivative instruments loss (gain) to net income (net of taxes of $(11), $3, $(32), and $19, respectively) 39 (10) 110 (59)
Benefit plan adjustments (net of taxes of $1, $1, $3, and $2, respectively) (3) (2) (9) (5)
Total other comprehensive (loss) income (112) 10 (207) 81
Comprehensive income 678 664 2,478 2,220
Comprehensive income attributable to noncontrolling interests (26) (26) (78) (79)
Comprehensive income attributable to KMI $ 652 $ 638 $ 2,400 $ 2,141