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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Statement of Comprehensive Income [Abstract]        
Net income $ 940 $ 693 $ 2,484 $ 2,112
Other comprehensive income (loss), net of tax        
Change in fair value of derivatives, net of tax of $(1), $(10), $(7) and $9, respectively 3 35 24 (29)
Derivative amounts reclassified to net income, net of tax of $3, $(2), $(2) and $1, respectively (5) 4 6 (4)
Changes in benefit plan obligations and other, net of tax of $—, $—, $— and $—, respectively 0 1 1 (2)
Total other comprehensive income (loss), net of tax (2) 40 31 (35)
Comprehensive income 938 733 2,515 2,077
Less: Comprehensive income attributable to noncontrolling interests 1 0 68 0
Comprehensive income attributable to ONEOK $ 937 $ 733 $ 2,447 $ 2,077