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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Statement of Comprehensive Income [Abstract]        
Net income $ 853 $ 780 $ 1,544 $ 1,419
Other comprehensive income (loss), net of tax        
Change in fair value of derivatives, net of tax of $(17), $(3), $(6) and $19, respectively 58 11 21 (64)
Derivative amounts reclassified to net income, net of tax of $(2), $(3), $(5) and $3, respectively 1 13 11 (8)
Changes in benefit plan obligations and other, net of tax of $—, $—, $— and $—, respectively 1 (4) 1 (3)
Total other comprehensive income (loss), net of tax 60 20 33 (75)
Comprehensive income 913 800 1,577 1,344
Less: Comprehensive income attributable to noncontrolling interests (12) 0 (67) 0
Comprehensive income attributable to ONEOK $ 901 $ 800 $ 1,510 $ 1,344