2.2.0.25falsefalse006040 - Disclosure - Derivative Instruments and Hedging Activitiestruefalsefalse1falsefalseUSDfalsefalse1/1/2011 - 3/31/2011 USD ($) USD ($) / shares $c20110101to20110331http://www.sec.gov/CIK0000072207duration2011-01-01T00:00:002011-03-31T00:00:00U003Standardhttp://www.xbrl.org/2003/instancesharesxbrli0U001Standardhttp://www.xbrl.org/2003/iso4217USDiso42170U002Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0U004Standardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$2true0nbl_NotesToFinancialStatementsAbstractnblfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseNotes to Financial Statements [Abstract]3false0us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlockus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00<div><div><div align="justify" style="text-indent: 0pt; display: block; margin-left: 0pt; margin-right: 0pt;"><font style="display: inline; font-family: Times New Roman; font-size: 10pt; font-weight: bold;">Note 4.&#160;&#160;Derivative Instruments and Hedging Activities</font></div><div style="text-indent: 0pt; display: block;"><br /></div><div align="left" style="text-indent: 0pt; display: block; margin-left: 0pt; margin-right: 0pt;"><font style="display: inline; font-family: Times New Roman; font-size: 10pt;"><font style="font-style: italic; display: inline;">Objective and Strategies for Using Derivative Instruments</font>&#160;&#160;&#160;In order to reduce commodity price uncertainty and enhance the predictability of cash flows relating to the marketing of our crude oil and natural gas, we enter into crude oil and natural gas price hedging arrangements with respect to a portion of our expected production. The derivative instruments we use include variable to fixed price commodity swaps, two-way and three-way collars and basis swaps.</font></div><div style="text-indent: 0pt; display: block;"><br /></div><div align="left" style="text-indent: 0pt; display: block; margin-left: 0pt; margin-right: 0pt;"><font style="display: inline; font-family: Times New Roman; font-size: 10pt;">The fixed price swap, two-way collar, and basis swap contracts entitle us (floating price payor) to receive settlement from the counterparty (fixed price payor) for each calculation period in amounts, if any, by which the settlement price for the scheduled trading days applicable for each calculation period is less than the fixed strike price or floor price. We would pay the counterparty if the settlement price for the scheduled trading days applicable for each calculation period is more than the fixed strike price or ceiling price. The amount payable by us, if the floating price is above the fixed or ceiling price, is the product of the notional quantity per calculation period and the excess of the floating price over the fixed or ceiling price in respect of each calculation period. The amount payable by the counterparty, if the floating price is below the fixed or floor price, is the product of the notional quantity per calculation period and the excess of the fixed or floor price over the floating price in respect of each calculation period.</font></div><div><br /></div><div align="left" style="text-indent: 0pt; display: block; margin-left: 0pt; margin-right: 0pt;"><font style="display: inline; font-family: Times New Roman; font-size: 10pt;">A three-way collar consists of a two-way collar contract combined with a put option contract sold by us with a strike price below the floor price of the two-way collar.&#160; We receive price protection at the purchased put option floor price of the two-way collar if commodity prices are above the sold put option strike price. If commodity prices fall below the sold put option strike price, we receive the cash market price plus the delta between the two put option strike prices. This type of instrument allows us to capture more value in a rising commodity price environment, but limits our benefits in a downward commodity price environment.</font></div><div style="text-indent: 0pt; display: block;"><br /></div><div align="left" style="text-indent: 0pt; display: block; margin-left: 0pt; margin-right: 0pt;"><font style="display: inline; font-family: Times New Roman; font-size: 10pt;">We also enter into forward contracts or swap agreements to hedge exposure to interest rate risk.</font></div><div style="text-indent: 0pt; display: block;"><br /></div><div align="left" style="text-indent: 0pt; display: block; margin-left: 0pt; margin-right: 0pt;"><font style="display: inline; font-family: Times New Roman; font-size: 10pt;">While these instruments mitigate the cash flow risk of future reductions in commodity prices or increases in interest rates, they may also curtail benefits from future increases in commodity prices or decreases in interest rates.</font></div><div style="text-indent: 0pt; display: block;"><br /></div><div align="left" style="text-indent: 0pt; display: block; margin-left: 0pt; margin-right: 0pt;"><font style="display: inline; font-family: Times New Roman; font-size: 10pt;">See Note 5. Fair Value Measurements and Disclosures for a discussion of <font style="display: inline;">methods and assumptions used to estimate the fair values of our derivative instruments.</font></font></div><div style="text-indent: 0pt; display: block;"><br /></div><div align="left" style="text-indent: 0pt; display: block; margin-left: 0pt; margin-right: 0pt;"><font style="display: inline; font-family: Times New Roman; font-size: 10pt;"><font style="font-style: italic; display: inline;">Counterparty Credit Risk&#160;&#160;&#160;</font>Derivative instruments expose us to counterparty credit risk. Our commodity derivative instruments are currently with a diversified group of highly rated major banks or market participants, and we control our level of financial exposure. Our commodity derivative contracts are executed under master agreements which allow us, in the event of default, to elect early termination of all contracts with the defaulting counterparty. If we choose to elect early termination, all asset and liability positions with the defaulting counterparty would be net settled at the time of election<font style="display: inline;">.</font></font></div><div style="text-indent: 0pt; display: block;"><br /></div><div align="left" style="text-indent: 0pt; display: block; margin-left: 0pt; margin-right: 0pt;"><font style="display: inline; font-family: Times New Roman; font-size: 10pt;">We monitor the creditworthiness of our counterparties. However, we are not able to predict sudden changes in counterparties' creditworthiness. In addition, even if such changes are not sudden, we may be limited in our ability to mitigate an increase in counterparty credit risk. Possible actions would be to transfer our position to another counterparty or request a voluntary termination of the derivative contracts resulting in a cash settlement. Should one of these financial counterparties not perform, we may not realize the benefit of some of our derivative instruments under lower commodity prices or higher interest rates, and could incur a loss.</font></div><div style="text-indent: 0pt; display: block;"><br /></div><div align="left" style="text-indent: 0pt; display: block; margin-left: 0pt; margin-right: 0pt;"><font style="display: inline; font-family: Times New Roman; font-size: 10pt;"><font style="font-style: italic; display: inline;">Interest Rate Derivative Instrument </font>In January 2010, we entered into an interest rate forward starting swap to effectively fix the cash flows related to interest payments on our anticipated debt issuance. On February 15, 2011 we settled the interest rate swap, which had a net liability position of $40 million. Approximately $26 million, net of tax, will remain in accumulated other comprehensive loss (AOCL) and be reclassified into interest expense over the&#160;term of the note. 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Debt.</font></div><div style="text-indent: 0pt; display: block;"><br /></div><div align="left" style="text-indent: 0pt; display: block; margin-left: 0pt; margin-right: 0pt;"><font style="display: inline; font-family: Times New Roman; font-size: 10pt;"><font style="font-style: italic; display: inline;">Unsettled Derivative Instruments</font>&#160;&#160;&#160;As of March 31, 2011, we had entered into the following crude oil derivative instruments:&#160;&#160;</font></div><div style="text-indent: 0pt; display: block;"><br /></div><div><table cellpadding="0" cellspacing="0" width="100%" style="font-family: times new roman; font-size: 10pt;"><tr><td valign="bottom" style="padding-bottom: 2px;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">&#160; </font></td><td valign="bottom" style="padding-bottom: 2px;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">&#160; </font></td><td valign="bottom" style="padding-bottom: 2px;"><font style="display: inline; 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font-family: times new roman; font-size: 10pt;">&#160;</font></td><td valign="bottom" width="1%"><font style="display: inline; font-family: times new roman; font-size: 10pt;">&#160;</font></td><td valign="bottom" width="1%" style="text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">&#160;</font></td><td valign="bottom" width="9%" style="text-align: right;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">-</font></td><td nowrap="nowrap" valign="bottom" width="1%" style="text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">&#160;</font></td><td valign="bottom" width="1%"><font style="display: inline; font-family: times new roman; font-size: 10pt;">&#160;</font></td><td valign="bottom" width="1%" style="text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">&#160;</font></td><td valign="bottom" width="9%" style="text-align: right;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">-</font></td><td nowrap="nowrap" valign="bottom" width="1%" style="text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">&#160;</font></td><td valign="bottom" width="1%"><font style="display: inline; font-family: times new roman; font-size: 10pt;">&#160;</font></td><td valign="bottom" width="1%" style="text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">&#160;</font></td><td valign="bottom" width="9%" style="text-align: right;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">-</font></td><td nowrap="nowrap" valign="bottom" width="1%" style="text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">&#160;</font></td></tr><tr bgcolor="#cceeff"><td valign="bottom" width="11%"><div align="center" style="text-indent: 0pt; display: block; margin-left: 0pt; margin-right: 0pt;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">2012</font></div></td><td valign="bottom" width="15%"><div align="center" style="text-indent: 0pt; display: block; margin-left: 0pt; margin-right: 0pt;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">Three-Way Collars</font></div></td><td valign="bottom" width="14%"><div align="center" style="text-indent: 0pt; display: block; margin-left: 0pt; margin-right: 0pt;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">NYMEX HH</font></div></td><td valign="bottom" width="1%"><font style="display: inline; font-family: times new roman; font-size: 10pt;">&#160;</font></td><td valign="bottom" width="1%" style="text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">&#160;</font></td><td valign="bottom" width="9%" style="text-align: right;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">110,000</font></td><td nowrap="nowrap" valign="bottom" width="1%" style="text-align: left;"><font style="display: inline; 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font-family: times new roman; font-size: 10pt;">NYMEX HH</font></div></td><td valign="bottom" width="1%"><font style="display: inline; font-family: times new roman; font-size: 10pt;">&#160;</font></td><td valign="bottom" width="1%" style="text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">&#160;</font></td><td valign="bottom" width="9%" style="text-align: right;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">30,000</font></td><td nowrap="nowrap" valign="bottom" width="1%" style="text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">&#160;</font></td><td valign="bottom" width="1%"><font style="display: inline; font-family: times new roman; font-size: 10pt;">&#160;</font></td><td valign="bottom" width="1%" style="text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">&#160;</font></td><td valign="bottom" width="9%" style="text-align: right;"><font style="display: inline; 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font-family: times new roman; font-size: 10pt;">&#160;</font></td><td valign="bottom" width="9%" style="text-align: right;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">-</font></td><td nowrap="nowrap" valign="bottom" width="1%" style="text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">&#160;</font></td><td valign="bottom" width="1%"><font style="display: inline; font-family: times new roman; font-size: 10pt;">&#160;</font></td><td valign="bottom" width="1%" style="text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">&#160;</font></td><td valign="bottom" width="9%" style="text-align: right;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">-</font></td><td nowrap="nowrap" valign="bottom" width="1%" style="text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">&#160;</font></td></tr><tr bgcolor="#cceeff"><td valign="bottom" width="11%" style="border-bottom: black 2px solid;"><div align="center" style="text-indent: 0pt; display: block; margin-left: 0pt; margin-right: 0pt;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"><font style="display: inline;">2013</font></font></div></td><td valign="bottom" width="15%" style="border-bottom: black 2px solid;"><div align="center" style="text-indent: 0pt; display: block; margin-left: 0pt; margin-right: 0pt;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"><font style="display: inline;">Three-Way Collars</font></font></div></td><td valign="bottom" width="14%" style="border-bottom: black 2px solid;"><div align="center" style="text-indent: 0pt; display: block; margin-left: 0pt; margin-right: 0pt;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"><font style="display: inline;">NYMEX HH</font></font></div></td><td valign="bottom" width="1%" style="border-bottom: black 2px solid;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">&#160;</font></td><td valign="bottom" width="1%" style="border-bottom: black 2px solid; 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font-family: times new roman; font-size: 10pt;"><font style="display: inline;">-</font></font></td><td nowrap="nowrap" valign="bottom" width="1%" style="border-bottom: black 2px solid; text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">&#160;</font></td><td valign="bottom" width="1%" style="border-bottom: black 2px solid;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">&#160;</font></td><td valign="bottom" width="1%" style="border-bottom: black 2px solid; text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">&#160;</font></td><td valign="bottom" width="9%" style="border-bottom: black 2px solid; text-align: right;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"><font style="display: inline;">4.00</font></font></td><td nowrap="nowrap" valign="bottom" width="1%" style="border-bottom: black 2px solid; text-align: left;"><font style="display: inline; 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font-family: times new roman; font-size: 10pt;">)</font></td></tr><tr bgcolor="white"><td valign="bottom" width="22%" style="border-bottom: black 2px solid;"><div align="center" style="text-indent: 0pt; display: block; margin-left: 0pt; margin-right: 0pt;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"><font style="display: inline;">2012</font></font></div></td><td valign="bottom" width="22%" style="border-bottom: black 2px solid; text-align: center; text-indent: 0pt; margin-left: 0pt; margin-right: 0pt;"><div style="text-align: center; text-indent: 0pt; display: block; margin-left: 0pt; margin-right: 0pt;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"><font style="display: inline;">IFERC CIG</font></font></div></td><td valign="bottom" width="22%" style="border-bottom: black 2px solid;"><div align="center" style="text-indent: 0pt; display: block; margin-left: 0pt; margin-right: 0pt;"><font style="display: inline; font-family: times new roman; 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