2.2.0.25falsefalse008090 - Disclosure - Stock-Based Compensation (Tables)truefalsefalse1falsefalseUSDfalsefalse1/1/2011 - 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.falsefalse3false0us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlockus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00<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;">We recognized stock-based compensation expense as follows:</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 align="left" valign="bottom" style="border-bottom: black 2px solid;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">  </font></td><td valign="bottom" style="border-bottom: black 2px solid;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td colspan="6" nowrap="nowrap" valign="bottom" 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 Months Ended March 31,</font></font></div></td><td nowrap="nowrap" valign="bottom" style="border-bottom: black 2px solid; text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td></tr><tr><td align="left" valign="bottom" style="border-bottom: black 2px solid;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">  </font></td><td valign="bottom" style="border-bottom: black 2px solid;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td colspan="2" valign="bottom" 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;">2011</font></font></div></td><td nowrap="nowrap" valign="bottom" style="border-bottom: black 2px solid; text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td valign="bottom" style="border-bottom: black 2px solid;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td colspan="2" valign="bottom" 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;">2010</font></font></div></td><td nowrap="nowrap" valign="bottom" style="border-bottom: black 2px solid; text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td></tr><tr bgcolor="white"><td align="left" valign="bottom"><div align="left" style="text-indent: -9pt; display: block; margin-left: 9pt; margin-right: 0pt;"><font style="font-style: italic; display: inline; font-family: times new roman; font-size: 10pt;">(millions)</font></div></td><td align="left" valign="bottom"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td align="left" colspan="2" valign="bottom"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td nowrap="nowrap" valign="bottom" style="text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td align="left" valign="bottom"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td align="left" colspan="2" valign="bottom"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td nowrap="nowrap" valign="bottom" style="text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td></tr><tr bgcolor="#cceeff"><td align="left" valign="bottom" width="76%"><div align="left" style="text-indent: -9pt; display: block; margin-left: 9pt; margin-right: 0pt;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">Stock-Based Compensation Expense</font></div></td><td valign="bottom" width="1%"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td valign="bottom" width="1%" style="text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">$</font></td><td valign="bottom" width="9%" style="text-align: right;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">14</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;"> </font></td><td valign="bottom" width="1%"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td valign="bottom" width="1%" style="text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">$</font></td><td valign="bottom" width="9%" style="text-align: right;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">14</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;"> </font></td></tr><tr bgcolor="white"><td align="left" valign="bottom" width="76%" style="border-bottom: black 2px solid;"><div align="left" style="text-indent: -9pt; display: block; margin-left: 9pt; margin-right: 0pt;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"><font style="display: inline;">Tax Benefit Recognized</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;"> </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;"> </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;">(5</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;">)</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;"> </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;"> </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;">(5</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;">)</font></td></tr></table></div><div> </div></div>We recognized stock-based compensation expense as follows:   Three Months Ended March 31,  falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringDisclosure that sets forth the allocation of share-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph 64
-Subparagraph b
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph g(1)
Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section F
falsefalse4false0us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlockus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00<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;">During the three months ended March 31, 2011, we granted stock options and awarded shares of restricted stock (subject to service conditions) as follows:</font></div><div style="text-indent: 0pt; display: block;"><br /></div><div align="left"><table cellpadding="0" cellspacing="0" width="100%" style="font-family: times new roman; font-size: 10pt;"><tr><td align="left" valign="bottom" style="border-bottom: black 2px solid;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">  </font></td><td valign="bottom" style="border-bottom: black 2px solid;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td colspan="2" valign="bottom" 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;">Number Granted/Awarded</font></font></div></td><td nowrap="nowrap" valign="bottom" style="border-bottom: black 2px solid; text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td valign="bottom" style="border-bottom: black 2px solid;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td colspan="2" nowrap="nowrap" valign="bottom" 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;">Weighted Average</font></font></div><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;">Grant-Date</font></font></div><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;">Fair Value</font></font></div></td><td nowrap="nowrap" valign="bottom" style="border-bottom: black 2px solid; text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td></tr><tr bgcolor="#cceeff"><td align="left" valign="bottom" width="76%"><div align="left" style="text-indent: -9pt; display: block; margin-left: 9pt; margin-right: 0pt;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">Stock Options</font></div></td><td align="left" valign="bottom" width="1%"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td valign="bottom" width="1%" style="text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td valign="bottom" width="9%" style="text-align: right;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">965,423</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;"> </font></td><td align="left" valign="bottom" width="1%"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </font></td><td valign="bottom" width="1%" style="text-align: left;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">$</font></td><td valign="bottom" width="9%" style="text-align: right;"><font style="display: inline; font-family: times new roman; font-size: 10pt;">30.21</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;"> </font></td></tr><tr bgcolor="white"><td align="left" valign="bottom" width="76%" style="border-bottom: black 2px solid;"><div align="left" style="text-indent: -9pt; display: block; margin-left: 9pt; margin-right: 0pt;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"><font style="display: inline;">Shares of Restricted Stock</font></font></div></td><td align="left" valign="bottom" width="1%" style="border-bottom: black 2px solid;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </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;"> </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;">394,922</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;"> </font></td><td align="left" valign="bottom" width="1%" style="border-bottom: black 2px solid;"><font style="display: inline; font-family: times new roman; font-size: 10pt;"> </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;">$</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;">90.37</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;"> </font></td></tr></table></div><div style="text-indent: 0pt; display: block;"><br /></div></div>During the three months ended March 31, 2011, we granted stock options and awarded shares of restricted stock (subject to service conditions) as follows: falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringDisclosure of components of a stock option or other award plan under which share-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from share-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from share-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph 64, 65, A240
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