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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Statement of Comprehensive Income [Abstract]      
Net income $ 3,112 $ 2,659 $ 1,722
Other comprehensive income (loss), net of tax      
Change in fair value of derivatives, net of tax of $16, $(46) and $(28), respectively (53) 155 93
Derivative amounts reclassified to net income, net of tax of $5, $21 and $(60), respectively (16) (66) 201
Changes in benefit plan obligations and other, net of tax of $(2), $3 and $(21), respectively 6 (14) 69
Total other comprehensive income (loss), net of tax (63) 75 363
Comprehensive income 3,049 2,734 2,085
Less: Comprehensive income attributable to noncontrolling interests (77) 0 0
Comprehensive income attributable to ONEOK $ 2,972 $ 2,734 $ 2,085