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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables)
12 Months Ended
Dec. 31, 2012
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 periods indicated:
 
 
Unrealized Gains
(Losses) on Energy
Marketing and
Risk Management
Assets/Liabilities
 
Unrealized
Holding
Gains (Losses) on
Investment
Securities
 
Pension and
Postretirement
Benefit Plan
Obligations
 
Accumulated
Other
Comprehensive
Income (Loss)
 
 
(Thousands of dollars)
January 1, 2011
 
$
15,731

 
$
1,371

 
$
(125,904
)
 
$
(108,802
)
Other comprehensive income (loss)
attributable to ONEOK
 
(71,098
)
 
(384
)
 
(25,837
)
 
(97,319
)
December 31, 2011
 
(55,367
)
 
987

 
(151,741
)
 
(206,121
)
Other comprehensive income (loss)
attributable to ONEOK
 
337

 
47

 
(11,061
)
 
(10,677
)
December 31, 2012
 
$
(55,030
)
 
$
1,034

 
$
(162,802
)
 
$
(216,798
)