CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues
Revenues	$ 10,164,367	$ 12,593,196	$ 12,173,907
Cost of sales and fuel (exclusive of items shown separately below)	6,788,040	9,422,708	9,538,045
Operations and maintenance	863,708	803,146	724,314
Depreciation and amortization	476,535	428,557	406,335
Impairment of long-lived assets (Note D)	0	0	15,970
General taxes	119,156	103,922	98,396
(Gain) loss on sale of assets	2,575	(601)	(924)
Operating income	1,914,353	1,835,464	1,391,771
Equity in net earnings from investments (Note M)	154,541	158,383	159,278
Impairment of equity investments (Note M)	0	0	(4,270)
Allowance for equity funds used during construction	64,815	7,962	107
Other income	27,058	674	15,385
Other expense	(18,003)	(14,928)	(35,812)
Interest expense (net of capitalized interest of $107,275, $28,062 and $5,510, respectively)	(491,773)	(469,620)	(485,658)
Income before income taxes	1,650,991	1,517,935	1,040,801
Income taxes (Note L)	(372,414)	(362,903)	(447,282)
Net income	1,278,577	1,155,032	593,519
Less: Net income attributable to noncontrolling interests	0	3,329	205,678
Net income attributable to ONEOK	1,278,577	1,151,703	387,841
Less: Preferred stock dividends	1,100	1,100	767
Net income available to common shareholders	$ 1,277,477	$ 1,150,603	$ 387,074
Basic earnings per common share (Note I)	$ 3.09	$ 2.80	$ 1.30
Diluted earnings per common share (Note I)	$ 3.07	$ 2.78	$ 1.29
Average shares (thousands)
Basic	413,560	411,485	297,477
Diluted	415,444	414,195	299,780
Commodity Sales
Revenues
Revenues	$ 8,916,047	$ 11,395,642	$ 9,862,652
Services
Revenues
Revenues	$ 1,248,320	$ 1,197,554	$ 2,311,255