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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Net income $ 320,251 $ 309,155 $ 311,963 $ 337,208 $ 292,888 $ 313,916 $ 282,179 $ 266,049 $ 1,278,577 $ 1,155,032 $ 593,519
Other comprehensive income (loss), net of tax                      
Change in fair value of derivatives, net of tax of $44,149, $1,694 and $19,006, respectively                 (147,803) (5,673) (21,408)
Derivative amounts reclassified to net income, net of tax of $6,058, $(11,013) and $(26,899), respectively                 (21,057) 36,870 63,687
Change in retirement and other postretirement benefit plan obligations, net of tax of $2,910, $(1,425) and $(878), respectively                 (9,696) 4,771 (4,175)
Other comprehensive income (loss) of unconsolidated affiliates, net of tax of $2,152, $(724) and $145, respectively                 (7,205) 2,424 (970)
Total other comprehensive income (loss), net of tax                 (185,761) 38,392 37,134
Comprehensive income                 1,092,816 1,193,424 630,653
Less: Comprehensive income attributable to noncontrolling interests                 0 3,329 236,704
Comprehensive income attributable to ONEOK                 $ 1,092,816 $ 1,190,095 $ 393,949