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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES - Part 1 (Details) (USD $)
1 Months Ended 1 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Designated as Hedging Instrument [Member]
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Dec. 31, 2012
Not Designated as Hedging Instrument [Member]
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
Dec. 31, 2012
Commodity Contract [Member]
Designated as Hedging Instrument [Member]
Financial Derivative Instrument [Member]
Dec. 31, 2011
Commodity Contract [Member]
Designated as Hedging Instrument [Member]
Financial Derivative Instrument [Member]
Dec. 31, 2012
Commodity Contract [Member]
Designated as Hedging Instrument [Member]
Physical Derivative Instrument [Member]
Dec. 31, 2011
Commodity Contract [Member]
Designated as Hedging Instrument [Member]
Physical Derivative Instrument [Member]
Dec. 31, 2012
Commodity Contract [Member]
Not Designated as Hedging Instrument [Member]
Financial Derivative Instrument [Member]
Non Trading [Member]
Dec. 31, 2011
Commodity Contract [Member]
Not Designated as Hedging Instrument [Member]
Financial Derivative Instrument [Member]
Non Trading [Member]
Dec. 31, 2012
Commodity Contract [Member]
Not Designated as Hedging Instrument [Member]
Financial Derivative Instrument [Member]
Trading [Member]
Dec. 31, 2011
Commodity Contract [Member]
Not Designated as Hedging Instrument [Member]
Financial Derivative Instrument [Member]
Trading [Member]
Dec. 31, 2012
Commodity Contract [Member]
Not Designated as Hedging Instrument [Member]
Physical Derivative Instrument [Member]
Non Trading [Member]
Dec. 31, 2011
Commodity Contract [Member]
Not Designated as Hedging Instrument [Member]
Physical Derivative Instrument [Member]
Non Trading [Member]
Dec. 31, 2012
Interest Rate Contract [Member]
Designated as Hedging Instrument [Member]
Dec. 31, 2011
Interest Rate Contract [Member]
Designated as Hedging Instrument [Member]
Jan. 31, 2012
Cash Flow Hedging [Member]
Forward Starting Interest Rate Swaps [Member]
Oneok Inc [Member]
Dec. 31, 2011
Cash Flow Hedging [Member]
Forward Starting Interest Rate Swaps [Member]
Oneok Inc [Member]
Jan. 31, 2012
Cash Flow Hedging [Member]
Forward Starting Interest Rate Swaps [Member]
Notes Payables due 2022 [Member]
Dec. 31, 2011
Cash Flow Hedging [Member]
Forward Starting Interest Rate Swaps [Member]
Oneok Partners [Member]
Jan. 31, 2012
Cash Flow Hedging [Member]
Forward Starting Interest Rate Swap [Member]
Oneok Inc [Member]
Jan. 31, 2012
Cash Flow Hedging [Member]
Forward Starting Interest Rate Swap [Member]
Oneok Inc [Member]
Interest Rate Contract [Member]
Dec. 31, 2012
Cash Flow Hedging [Member]
Forward Starting Interest Rate Swap [Member]
Oneok Partners [Member]
Sep. 30, 2012
Cash Flow Hedging [Member]
Forward Starting Interest Rate Swap [Member]
Oneok Partners [Member]
Sep. 30, 2012
Cash Flow Hedging [Member]
Forward Starting Interest Rate Swap [Member]
Oneok Partners [Member]
Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]                                                      
Notional amount of cash flow hedge instruments                                     $ 200,000,000 $ 500,000,000   $ 750,000,000     $ 650,000,000    
Assets 102,882,000 630,847,000 58,495,000 184,246,000 44,387,000 446,601,000 47,516,000 184,184,000 56,000 62,000 24,970,000 295,948,000 15,358,000 111,920,000 4,059,000 38,733,000 10,923,000 0                  
(Liabilities) (44,365,000) (637,241,000) (5,011,000) (202,356,000) (39,354,000) (434,885,000) (4,885,000) (73,346,000) (126,000) (344,000) (25,009,000) (323,170,000) (14,192,000) (110,050,000) (153,000) (1,665,000) 0 (128,666,000)                  
Inventory cash flow hedges derivative assets 16,900,000 88,900,000                                                  
Debt Instrument, Face Amount                                         700,000,000            
Debt Instrument, Interest Rate, Stated Percentage                                         4.25%            
Notional amount of cash flow hedge instruments settled                                               700,000,000     1,000,000,000
Amount of loss amortized to interest expense                                             44,100,000     124,900,000  
Notional Amount Of Cash Flow Hedge Instruments Greater Than 12 Months                                                 $ 400,000,000