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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Statement of Comprehensive Income [Abstract]    
Net income $ 691 $ 639
Other comprehensive income (loss), net of tax    
Change in fair value of derivatives, net of tax of $11 and $22, respectively (37) (75)
Derivative amounts reclassified to net income, net of tax of $(3) and $6, respectively 10 (21)
Changes in benefit plan obligations and other, net of tax of $— and $—, respectively 0 1
Total other comprehensive loss, net of tax (27) (95)
Comprehensive income 664 544
Less: Comprehensive income attributable to noncontrolling interests (55) 0
Comprehensive income attributable to ONEOK $ 609 $ 544