CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 11,975	$ 37,193
Accounts receivable, net	818,958	1,202,951
Materials and supplies	141,174	90,301
Natural gas and natural gas liquids in storage	296,667	342,293
Commodity imbalances	29,050	38,712
Other current assets	100,808	53,008
Total current assets	1,398,632	1,764,458
Property, plant and equipment
Property, plant and equipment	18,030,963	15,559,667
Accumulated depreciation and amortization	3,264,312	2,861,541
Net property, plant and equipment (Note D)	14,766,651	12,698,126
Investments and other assets
Investments in unconsolidated affiliates (Note M)	969,150	1,003,156
Goodwill and intangible assets (Note E)	967,142	993,460
Deferred Tax Assets, Net, Noncurrent	0	205,907
Other assets	130,096	180,830
Total investments and other assets	2,066,388	2,383,353
Total assets	18,231,671	16,845,937
Current liabilities
Current maturities of long-term debt (Note F)	507,650	432,650
Short-term borrowings (Note F)	0	614,673
Accounts payable	1,118,102	1,140,571
Commodity imbalances	110,197	164,161
Accrued interest	161,377	135,309
Other current liabilities	211,110	179,971
Total current liabilities	2,108,436	2,667,335
Long-term debt, excluding current maturities (Note F)	8,873,334	8,091,629
Deferred credits and other liabilities
Deferred income taxes (Note L)	219,731	52,697
Other deferred credits	450,627	348,924
Total deferred credits and other liabilities	670,358	401,621
Commitments and contingencies (Note N)
Equity (Note G)
Common stock, $0.01 par value: authorized 1,200,000,000 shares; issued 445,016,234 shares and outstanding 411,532,606 shares at December 31, 2018; issued 423,166,234 shares and outstanding 388,703,543 shares at December 31, 2017	4,450	4,232
Preferred stock, $0.01 par value: authorized and issued 20,000 shares at December 31, 2018, and at December 31, 2017	0	0
Paid-in capital	7,615,138	6,588,878
Accumulated other comprehensive loss (Note H)	(188,239)	(188,530)
Retained earnings	0	0
Treasury stock, at cost: 33,483,628 shares at December 31, 2018, and 34,462,691 shares at December 31, 2017	(851,806)	(876,713)
Total ONEOK shareholders’ equity	6,579,543	5,527,867
Noncontrolling interests in consolidated subsidiaries	0	157,485
Total equity	6,579,543	5,685,352
Total liabilities and equity	$ 18,231,671	$ 16,845,937