RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES - Part 1 (Details) (USD $)
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1 Months Ended | 1 Months Ended | |||||||||||||||||||||||||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2012
Designated as Hedging Instrument [Member]
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Dec. 31, 2011
Designated as Hedging Instrument [Member]
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Dec. 31, 2012
Not Designated as Hedging Instrument [Member]
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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]
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Dec. 31, 2011
Interest Rate Contract [Member]
Designated as Hedging Instrument [Member]
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Jan. 31, 2012
Cash Flow Hedging [Member]
Forward Starting Interest Rate Swaps [Member]
Oneok Inc [Member]
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Dec. 31, 2011
Cash Flow Hedging [Member]
Forward Starting Interest Rate Swaps [Member]
Oneok Inc [Member]
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Jan. 31, 2012
Cash Flow Hedging [Member]
Forward Starting Interest Rate Swaps [Member]
Notes Payables due 2022 [Member]
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Dec. 31, 2011
Cash Flow Hedging [Member]
Forward Starting Interest Rate Swaps [Member]
Oneok Partners [Member]
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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]
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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 |