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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 $ 967 $ 853 $ 1,743 $ 1,544
Other comprehensive income (loss), net of tax        
Change in fair value of derivatives, net of tax of $(7), $(17), $84 and $(6), respectively 16 58 (287) 21
Derivative amounts reclassified to net income, net of tax of $(66), $(2), $(85) and $(5), respectively 221 1 285 11
Changes in benefit plan obligations and other, net of tax of $—, $—, $— and $—, respectively 1 1 1 1
Total other comprehensive income (loss), net of tax 238 60 (1) 33
Comprehensive income 1,205 913 1,742 1,577
Less: Comprehensive income attributable to noncontrolling interests 1 12 3 67
Comprehensive income attributable to ONEOK $ 1,204 $ 901 $ 1,739 $ 1,510