CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues
Commodity sales	$ 11,395,642	$ 9,862,652	$ 6,858,456
Services	1,197,554	2,311,255	2,062,478
Total revenues	12,593,196	12,173,907	8,920,934
Cost of sales and fuel (exclusive of items shown separately below)	9,422,708	9,538,045	6,496,124
Operations and maintenance	803,146	724,314	658,233
Depreciation and amortization	428,557	406,335	391,585
Impairment of long-lived assets (Note D)	0	15,970	0
General taxes	103,922	98,396	88,849
Gain on sale of assets	(601)	(924)	(9,635)
Operating income	1,835,464	1,391,771	1,295,778
Equity in net earnings from investments (Note M)	158,383	159,278	139,690
Impairment of equity investments (Note M)	0	(4,270)	0
Allowance for equity funds used during construction	7,962	107	209
Other income	674	15,385	6,091
Other expense	(14,928)	(35,812)	(14,161)
Interest expense (net of capitalized interest of $28,062, $5,510 and $10,591, respectively)	(469,620)	(485,658)	(469,651)
Income before income taxes	1,517,935	1,040,801	957,956
Income taxes (Note L)	(362,903)	(447,282)	(212,406)
Income from continuing operations	1,155,032	593,519	745,550
Income (loss) from discontinued operations, net of tax	0	0	(2,051)
Net income	1,155,032	593,519	743,499
Less: Net income attributable to noncontrolling interests	3,329	205,678	391,460
Net income attributable to ONEOK	1,151,703	387,841	352,039
Less: Preferred stock dividends	1,100	767	0
Net income available to common shareholders	1,150,603	387,074	352,039
Amounts available to common shareholders:
Income from continuing operations	1,150,603	387,074	354,090
Income (loss) from discontinued operations	0	0	(2,051)
Net income available to common shareholders	$ 1,150,603	$ 387,074	$ 352,039
Basic earnings per common share:
Income from continuing operations (Note I)	$ 2.80	$ 1.30	$ 1.68
Income (loss) from discontinued operations	0.00	0.00	(0.01)
Net income	2.80	1.30	1.67
Diluted earnings per common share:
Income from continuing operations (Note I)	2.78	1.29	1.67
Income (loss) from discontinued operations	0.00	0.00	(0.01)
Net income	$ 2.78	$ 1.29	$ 1.66
Average shares (thousands)
Basic	411,485	297,477	211,128
Diluted	414,195	299,780	212,383