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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables)
 9 Months Ended
Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Accumulated other comprehensive income (loss)
The following table sets forth the balance in accumulated other comprehensive income (loss) for the period indicated:
 
Unrealized Gains
(Losses) on Risk-
Management
Assets/Liabilities (a)
 
Unrealized
Holding Gains
(Losses)
on Investment
Securities (a)
 
Pension and
Postretirement
Benefit Plan
Obligations (a) (b)
 
Accumulated
Other
Comprehensive
Income (Loss) (a)
 
(Thousands of dollars)
January 1, 2015
$
(37,349
)
 
$
955

 
$
(99,959
)
 
$
(136,353
)
Other comprehensive income (loss) before reclassifications
3,661

 
(955
)
 
65

 
2,771

Amounts reclassified from accumulated other comprehensive income (loss)
(9,785
)
 
—

 
7,255

 
(2,530
)
Net current period other comprehensive income (loss) attributable to ONEOK
(6,124
)
 
(955
)
 
7,320

 
241

September 30, 2015
$
(43,473
)
 
$
—

 
$
(92,639
)
 
$
(136,112
)
(a) All amounts are presented net of tax.
(b) Includes amounts related to supplemental executive retirement plan.
Disclosure of Reclassification Amount [Text Block]
The following table sets forth the effect of reclassifications from accumulated other comprehensive income (loss) in our Consolidated Statements of Income for the periods indicated:
Details about Accumulated Other
Comprehensive Income (Loss)
Components
 
Three Months Ended
 
Nine Months Ended
 
Affected Line Item in the
Consolidated
Statements of Income
 
September 30,
 
September 30,
 
 
2015
 
2014
 
2015
 
2014
 
 
 
(Thousands of dollars)
 
 
Unrealized (gains) losses on risk-management assets/liabilities
 
 
 
 
 
 
 
 
 
 
Commodity contracts
 
$
(22,770
)
 
$
355

 
$
(54,020
)
 
$
31,961

 
Commodity sales revenues
Interest-rate contracts
 
4,554

 
3,525

 
12,869

 
18,372

 
Interest expense
 
 
(18,216
)
 
3,880

 
(41,151
)
 
50,333

 
Income before income taxes
 
 
2,957

 
(748
)
 
5,621

 
(9,845
)
 
Income tax expense
 
 
(15,259
)
 
3,132

 
(35,530
)
 
40,488

 
Income from continuing operations
 
 
—

 
—

 
—

 
7,682

 
Income (loss) from discontinued operations
 
 
(15,259
)

3,132

 
(35,530
)
 
48,170

 
Net income
Noncontrolling interests
 
(10,150
)
 
1,928

 
(25,745
)
 
24,574

 
Less: Net income attributable to noncontrolling interests
 
 
$
(5,109
)
 
$
1,204

 
$
(9,785
)
 
$
23,596

 
Net income attributable to ONEOK
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Pension and postretirement benefit plan obligations (a)
 
 
 
 
 
 
 
 
 
 
Amortization of net loss
 
$
4,422

 
$
4,009

 
$
13,268

 
$
11,936

 
 
Amortization of unrecognized prior service cost
 
(392
)
 
(368
)
 
(1,176
)
 
(1,102
)
 
 
 
 
4,030

 
3,641

 
12,092

 
10,834

 
Income before income taxes
 
 
(1,612
)
 
(1,456
)
 
(4,837
)
 
(4,334
)
 
Income tax expense
 
 
2,418

 
2,185

 
7,255

 
6,500

 
Income from continuing operations
 
 
—

 
—

 
—

 
1,648

 
Income from discontinued operations
 
 
$
2,418

 
$
2,185

 
$
7,255

 
$
8,148

 
Net income attributable to ONEOK
 
 
 
 
 
 
 
 
 
 
 
Total reclassifications for the period attributable to ONEOK
 
$
(2,691
)
 
$
3,389

 
$
(2,530
)
 
$
31,744

 
Net income attributable to ONEOK
(a) These components of accumulated other comprehensive income (loss) are included in the computation of net periodic benefit cost. See Note K for additional detail of our net periodic benefit cost.