2.2.0.7 false Significant Accounting Policies (Tables) 3010 - Disclosure - Significant Accounting Policies (Tables) true false false false 1 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 USDPerShare Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 $ 2 Significant Accounting Policies 0 ceg_SignificantAccountingPoliciesDisclosureAbstract ceg false na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 3 Schedule of primary components of accrual revenues 1 ceg_ScheduleDisclosingComponentsOfAccrualRevenuesTextBlock ceg false na duration This element represents various types of regulated and nonregulated activities performed by the entity and the related... false false false false false false false false false false false terselabel false 1 false false false false 0 0 <table style="font-size:10pt; font-family:'Times New Roman',times,serif;"> <tr> <td>   <div style="PADDING-RIGHT: 0pt; PADDING-LEFT: 0pt; PADDING-BOTTOM: 0pt; MARGIN-LEFT: 10%; WIDTH: 80%; PADDING-TOP: 0pt; POSITION: relative">   <div align="center"> <table cellspacing="0" cellpadding="0" width="100%" border="0"> <tr style="HEIGHT: 0px"> <td style="FONT-FAMILY: times" align="left"></td> <td style="FONT-FAMILY: times" width="12"></td> <td style="FONT-FAMILY: times" align="center" width="60"></td> <td style="FONT-FAMILY: times" width="12"></td> <td style="FONT-FAMILY: times" align="center" width="60"></td> <td style="FONT-FAMILY: times" width="12"></td> <td style="FONT-FAMILY: times" align="center" width="60"></td></tr> <tr style="HEIGHT: 0px" valign="bottom"> <th style="FONT-FAMILY: times" align="left">  </th> <th style="FONT-FAMILY: times"> </th> <th style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" align="center" colspan="5">Activity </th></tr> <tr style="HEIGHT: 0px" valign="bottom"> <th style="FONT-FAMILY: times" align="center">Component of Accrual Revenues </th> <th style="FONT-FAMILY: times"> </th> <th style="FONT-FAMILY: times" align="center">Nonregulated Physical Energy Delivery </th> <th style="FONT-FAMILY: times"> </th> <th style="FONT-FAMILY: times" align="center">Regulated Electricity and Gas Sales </th> <th style="FONT-FAMILY: times"> </th> <th style="FONT-FAMILY: times" align="center">Other Nonregulated Products and Services </th></tr> <tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="bottom"> <th style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" align="center" colspan="7"> </th></tr> <tr style="HEIGHT: 0px" valign="bottom" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times"> Gross amounts receivable for sales of products or services based on contract, tariff, or spot price</td> <td style="FONT-FAMILY: times"> </td> <td style="FONT-FAMILY: times" valign="middle" align="center">X</td> <td style="FONT-FAMILY: times" valign="middle"> </td> <td style="FONT-FAMILY: times" valign="middle" align="center">X</td> <td style="FONT-FAMILY: times" valign="middle"> </td> <td style="FONT-FAMILY: times" valign="middle" align="center">X</td></tr> <tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="top"> <td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" valign="bottom" colspan="7"> </td></tr> <tr style="HEIGHT: 0px" valign="bottom" bgcolor="white"> <td style="FONT-FAMILY: times"> Reclassification of net gains/losses on cash flow hedges from AOCI</td> <td style="FONT-FAMILY: times"> </td> <td style="FONT-FAMILY: times" valign="middle" align="center">X</td> <td style="FONT-FAMILY: times" valign="middle"> </td> <td style="FONT-FAMILY: times" valign="middle" align="center"> </td> <td style="FONT-FAMILY: times" valign="middle"> </td> <td style="FONT-FAMILY: times" valign="middle" align="center"> </td></tr> <tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="top"> <td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" valign="bottom" colspan="7"> </td></tr> <tr style="HEIGHT: 0px" valign="bottom" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times"> Ineffective portion of net gains/losses on cash flow hedges</td> <td style="FONT-FAMILY: times"> </td> <td style="FONT-FAMILY: times" valign="middle" align="center">X</td> <td style="FONT-FAMILY: times" valign="middle"> </td> <td style="FONT-FAMILY: times" valign="middle" align="center"> </td> <td style="FONT-FAMILY: times" valign="middle"> </td> <td style="FONT-FAMILY: times" valign="middle" align="center"> </td></tr> <tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="top"> <td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" valign="bottom" colspan="7"> </td></tr> <tr style="HEIGHT: 0px" valign="bottom" bgcolor="white"> <td style="FONT-FAMILY: times"> Amortization of acquired energy contract assets or liabilities</td> <td style="FONT-FAMILY: times"> </td> <td style="FONT-FAMILY: times" valign="middle" align="center">X</td> <td style="FONT-FAMILY: times" valign="middle"> </td> <td style="FONT-FAMILY: times" valign="middle" align="center"> </td> <td style="FONT-FAMILY: times" valign="middle"> </td> <td style="FONT-FAMILY: times" valign="middle" align="center"> </td></tr> <tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="top"> <td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" valign="bottom" colspan="7"> </td></tr> <tr style="HEIGHT: 0px" valign="bottom" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times"> Recovery or refund of deferred SOS and gas cost adjustment clause regulatory assets/liabilities</td> <td style="FONT-FAMILY: times"> </td> <td style="FONT-FAMILY: times" valign="middle" align="center"> </td> <td style="FONT-FAMILY: times" valign="middle"> </td> <td style="FONT-FAMILY: times" valign="middle" align="center">X</td> <td style="FONT-FAMILY: times" valign="middle"> </td> <td style="FONT-FAMILY: times" valign="middle" align="center"> </td></tr> <tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="top"> <td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" valign="bottom" colspan="7"> </td></tr></table></div> </div></td></tr></table>        Activity Component of Accrual false false false us-types:textBlockItemType textblock This element represents various types of regulated and nonregulated activities performed by the entity and the related component of accrual revenues. No authoritative reference available. false 4 Schedule of primary components of accrual purchased fuel and energy expense 1 ceg_ScheduleDisclosingPrimaryComponentsOfAccrualPurchasedFuelAndEnergyExpenseTextBlock ceg false na duration This element represents various types of regulated and nonregulated activities performed by the entity and the related... false false false false false false false false false false false terselabel false 1 false false false false 0 0 <table style="font-size:10pt; font-family:'Times New Roman',times,serif;"> <tr> <td> <div style="PADDING-RIGHT: 0pt; PADDING-LEFT: 0pt; PADDING-BOTTOM: 0pt; MARGIN-LEFT: 10%; WIDTH: 80%; PADDING-TOP: 0pt; POSITION: relative">   <div align="center"> <table cellspacing="0" cellpadding="0" width="100%" border="0"> <tr style="HEIGHT: 0px"> <td style="FONT-FAMILY: times" align="left"></td> <td style="FONT-FAMILY: times" width="12"></td> <td style="FONT-FAMILY: times" align="center" width="60"></td> <td style="FONT-FAMILY: times" width="12"></td> <td style="FONT-FAMILY: times" align="center" width="60"></td> <td style="FONT-FAMILY: times" width="12"></td> <td style="FONT-FAMILY: times" align="center" width="60"></td></tr> <tr style="HEIGHT: 0px" valign="bottom"> <th style="FONT-FAMILY: times" align="left">  </th> <th style="FONT-FAMILY: times"> </th> <th style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" align="center" colspan="5">Activity </th></tr> <tr style="HEIGHT: 0px" valign="bottom"> <th style="FONT-FAMILY: times" align="center">Component of Accrual Fuel and Purchased Energy Expense </th> <th style="FONT-FAMILY: times"> </th> <th style="FONT-FAMILY: times" align="center">Nonregulated Physical Energy Delivery </th> <th style="FONT-FAMILY: times"> </th> <th style="FONT-FAMILY: times" align="center">Regulated Electricity and Gas Sales </th> <th style="FONT-FAMILY: times"> </th> <th style="FONT-FAMILY: times" align="center">Other Nonregulated Products and Services </th></tr> <tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="bottom"> <th style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" align="center" colspan="7"> </th></tr> <tr style="HEIGHT: 0px" valign="bottom" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times" valign="top"> Actual costs of fuel and purchased energy</td> <td style="FONT-FAMILY: times" valign="top"> </td> <td style="FONT-FAMILY: times" valign="middle" align="center">X</td> <td style="FONT-FAMILY: times" valign="middle"> </td> <td style="FONT-FAMILY: times" valign="middle" align="center">X</td> <td style="FONT-FAMILY: times" valign="middle"> </td> <td style="FONT-FAMILY: times" valign="middle" align="center">X</td></tr> <tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="top"> <td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" colspan="7"> </td></tr> <tr style="HEIGHT: 0px" valign="bottom" bgcolor="white"> <td style="FONT-FAMILY: times" valign="top"> Reclassification of net gains/losses on cash flow hedges from AOCI</td> <td style="FONT-FAMILY: times" valign="top"> </td> <td style="FONT-FAMILY: times" valign="middle" align="center">X</td> <td style="FONT-FAMILY: times" valign="middle"> </td> <td style="FONT-FAMILY: times" valign="middle" align="center"> </td> <td style="FONT-FAMILY: times" valign="middle"> </td> <td style="FONT-FAMILY: times" valign="middle" align="center"> </td></tr> <tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="top"> <td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" colspan="7"> </td></tr> <tr style="HEIGHT: 0px" valign="bottom" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times" valign="top"> Ineffective portion of net gains/losses on cash flow hedges</td> <td style="FONT-FAMILY: times" valign="top"> </td> <td style="FONT-FAMILY: times" valign="middle" align="center">X</td> <td style="FONT-FAMILY: times" valign="middle"> </td> <td style="FONT-FAMILY: times" valign="middle" align="center"> </td> <td style="FONT-FAMILY: times" valign="middle"> </td> <td style="FONT-FAMILY: times" valign="middle" align="center"> </td></tr> <tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="top"> <td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" colspan="7"> </td></tr> <tr style="HEIGHT: 0px" valign="bottom" bgcolor="white"> <td style="FONT-FAMILY: times" valign="top"> Amortization of acquired energy contract assets or liabilities</td> <td style="FONT-FAMILY: times" valign="top"> </td> <td style="FONT-FAMILY: times" valign="middle" align="center">X</td> <td style="FONT-FAMILY: times" valign="middle"> </td> <td style="FONT-FAMILY: times" valign="middle" align="center"> </td> <td style="FONT-FAMILY: times" valign="middle"> </td> <td style="FONT-FAMILY: times" valign="middle" align="center"> </td></tr> <tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="top"> <td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" colspan="7"> </td></tr> <tr style="HEIGHT: 0px" valign="bottom" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times" valign="top"> Deferral or amortization of deferred SOS and gas cost adjustment clause regulatory assets/liabilities</td> <td style="FONT-FAMILY: times" valign="top"> </td> <td style="FONT-FAMILY: times" valign="middle" align="center"> </td> <td style="FONT-FAMILY: times" valign="middle"> </td> <td style="FONT-FAMILY: times" valign="middle" align="center">X</td> <td style="FONT-FAMILY: times" valign="middle"> </td> <td style="FONT-FAMILY: times" valign="middle" align="center"> </td></tr> <tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="top"> <td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" colspan="7"> </td></tr></table></div> </div></td></tr></table>      Activity Component of Accrual Fuel and Purchased false false false us-types:textBlockItemType textblock This element represents various types of regulated and nonregulated activities performed by the entity and the related component of accrual fuel and purchased energy expense. No authoritative reference available. false 5 Schedule of permissible accounting treatments for derivatives and effects on financial statements 1 ceg_ScheduleOfAccountingTreatmentForDerivativesAffectingFinancialStatementsTextBlock ceg false na duration This element represents the permissible accounting treatments for derivatives and the recognition and measurement criteria... false false false false false false false false false false false terselabel false 1 false false false false 0 0 <table style="font-size:10pt; font-family:'Times New Roman',times,serif;"> <tr> <td> <div style="PADDING-RIGHT: 0pt; PADDING-LEFT: 0pt; PADDING-BOTTOM: 0pt; MARGIN-LEFT: 10%; WIDTH: 80%; PADDING-TOP: 0pt; POSITION: relative">   <div align="center"> <table cellspacing="0" cellpadding="0" width="100%" border="0"> <tr style="HEIGHT: 0px"> <td style="FONT-FAMILY: times" align="left" width="63"></td> <td style="FONT-FAMILY: times" width="12"></td> <td style="FONT-FAMILY: times" align="left" width="44%"></td> <td style="FONT-FAMILY: times" width="12"></td> <td style="FONT-FAMILY: times" align="left" width="44%"></td></tr> <tr style="HEIGHT: 0px" valign="bottom"> <th style="FONT-FAMILY: times" align="left">  </th> <th style="FONT-FAMILY: times" rowspan="2"> </th> <th style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" align="center" colspan="3" rowspan="2">Recognition and Measurement</th></tr> <tr style="HEIGHT: 0px" valign="bottom"> <th style="FONT-FAMILY: times" align="center" rowspan="2">Accounting Treatment </th></tr> <tr style="HEIGHT: 0px" valign="bottom"> <th style="FONT-FAMILY: times"> </th> <th style="FONT-FAMILY: times" align="center">Balance Sheet </th> <th style="FONT-FAMILY: times"> </th> <th style="FONT-FAMILY: times" align="center">Income Statement </th></tr> <tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="bottom"> <th style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" align="center" colspan="5"> </th></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times">Mark-to-market</td> <td style="FONT-FAMILY: times"> </td> <td style="FONT-FAMILY: times">  Derivative asset or liability recorded at fair value</td> <td style="FONT-FAMILY: times"> </td> <td style="FONT-FAMILY: times">  Changes in fair value recognized in earnings</td></tr> <tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="top"> <td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" colspan="5"> </td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="white"> <td style="FONT-FAMILY: times">Cash flow hedge</td> <td style="FONT-FAMILY: times"> </td> <td style="FONT-FAMILY: times">  Derivative asset or liability recorded at fair value   Effective changes in fair value recognized in accumulated other comprehensive income</td> <td style="FONT-FAMILY: times"> </td> <td style="FONT-FAMILY: times">  Ineffective changes in fair value recognized in earnings   Amounts in accumulated other comprehensive income reclassified to earnings when the hedged forecasted transaction affects earnings or becomes probable of not occurring</td></tr> <tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="top"> <td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" colspan="5"> </td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times">Fair value hedge</td> <td style="FONT-FAMILY: times"> </td> <td style="FONT-FAMILY: times">  Derivative asset or liability recorded at fair value   Book value of hedged asset or liability adjusted for changes in its fair value</td> <td style="FONT-FAMILY: times"> </td> <td style="FONT-FAMILY: times">  Changes in fair value recognized in earnings   Changes in fair value of hedged asset or liability recognized in earnings</td></tr> <tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="top"> <td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" colspan="5"> </td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="white"> <td style="FONT-FAMILY: times">NPNS (accrual)</td> <td style="FONT-FAMILY: times"> </td> <td style="FONT-FAMILY: times">  Fair value not recorded   Accounts receivable or accounts payable recorded when derivative settles</td> <td style="FONT-FAMILY: times"> </td> <td style="FONT-FAMILY: times">  Changes in fair value not recognized in earnings   Revenue or expense recognized in earnings when underlying physical commodity is sold or consumed</td></tr> <tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="top"> <td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" colspan="5"> </td></tr></table></div> </div></td></tr></table>      Recognition and Measurement Accounting Treatment   Balance Sheet   Income false false false us-types:textBlockItemType textblock This element represents the permissible accounting treatments for derivatives and the recognition and measurement criteria for each on the balance sheet and income statement. No authoritative reference available. false 6 Taxes other than income taxes included in revenues 1 ceg_TaxesOtherThanIncomeTaxTextBlock ceg false na duration This element may be used to capture the entire details of taxes other than income taxes included in revenues. false false false false false false false false false false false terselabel false 1 false false false false 0 0 <table style="font-size:10pt; font-family:'Times New Roman',times,serif;"> <tr> <td> <div style="PADDING-RIGHT: 0pt; PADDING-LEFT: 0pt; PADDING-BOTTOM: 0pt; MARGIN-LEFT: 10%; WIDTH: 80%; PADDING-TOP: 0pt; POSITION: relative">   <div align="center"> <table cellspacing="0" cellpadding="0" width="100%" border="0"> <tr style="HEIGHT: 0px"> <td style="FONT-FAMILY: times" align="left"></td> <td style="FONT-FAMILY: times" width="12"></td> <td style="FONT-FAMILY: times" align="right" width="6"></td> <td style="FONT-FAMILY: times" width="37"></td> <td style="FONT-FAMILY: times" width="12"></td> <td style="FONT-FAMILY: times" align="right" width="6"></td> <td style="FONT-FAMILY: times" width="36"></td> <td style="FONT-FAMILY: times" width="12"></td> <td style="FONT-FAMILY: times" align="right" width="6"></td> <td style="FONT-FAMILY: times" width="36"></td> <td style="FONT-FAMILY: times" width="12"></td></tr> <tr style="HEIGHT: 0px" valign="bottom"> <th style="FONT-FAMILY: times" align="left">Year Ended December 31, </th> <th style="FONT-FAMILY: times"> </th> <th style="FONT-FAMILY: times" align="center" colspan="2">2009 </th> <th style="FONT-FAMILY: times"> </th> <th style="FONT-FAMILY: times" align="center" colspan="2">2008 </th> <th style="FONT-FAMILY: times"> </th> <th style="FONT-FAMILY: times" align="center" colspan="2">2007 </th> <th style="FONT-FAMILY: times"> </th></tr> <tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="bottom"> <th style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" align="center" colspan="10"> </th> <th style="FONT-FAMILY: times"> </th></tr> <tr style="HEIGHT: 0px" valign="bottom"> <th style="FONT-FAMILY: times" align="left">  </th> <th style="FONT-FAMILY: times"> </th> <th style="FONT-FAMILY: times" align="center" colspan="8">(In millions) </th> <th style="FONT-FAMILY: times"> </th></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times" valign="bottom"> Constellation Energy (including BGE)</td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom">$</td> <td style="FONT-FAMILY: times" valign="bottom" align="right">106.8</td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom">$</td> <td style="FONT-FAMILY: times" valign="bottom" align="right">111.7</td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom">$</td> <td style="FONT-FAMILY: times" valign="bottom" align="right">113.4</td> <td style="FONT-FAMILY: times" valign="bottom"> </td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="white"> <td style="FONT-FAMILY: times" valign="bottom"> BGE</td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom" align="right">76.8</td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom" align="right">73.2</td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom" align="right">77.0</td> <td style="FONT-FAMILY: times" valign="bottom"> </td></tr> <tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="top"> <td style="BORDER-BOTTOM: #000000 2.25pt double; FONT-FAMILY: times" valign="bottom" colspan="10"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td></tr></table></div> </div></td></tr></table>  Year Ended December 31,   2009   2008   2007           (In false false false us-types:textBlockItemType textblock This element may be used to capture the entire details of taxes other than income taxes included in revenues. No authoritative reference available. false 7 Schedule of non-dilutive stock options and dilutive common stock equivalent shares 1 ceg_ScheduleOfNondilutiveSecuritiesAndDilutiveCommonStockEquivalentSharesTextBlock ceg false na duration Schedule of non-dilutive stock options and dilutive common stock equivalent shares. false false false false false false false false false false false terselabel false 1 false false false false 0 0 <table style="font-size:10pt; font-family:'Times New Roman',times,serif;"> <tr> <td> <div style="PADDING-RIGHT: 0pt; PADDING-LEFT: 0pt; PADDING-BOTTOM: 0pt; MARGIN-LEFT: 10%; WIDTH: 80%; PADDING-TOP: 0pt; POSITION: relative">   <div align="center"> <table cellspacing="0" cellpadding="0" width="100%" border="0"> <tr style="HEIGHT: 0px"> <td style="FONT-FAMILY: times" align="left"></td> <td style="FONT-FAMILY: times" width="12"></td> <td style="FONT-FAMILY: times" align="right" width="6"></td> <td style="FONT-FAMILY: times" width="28"></td> <td style="FONT-FAMILY: times" width="12"></td> <td style="FONT-FAMILY: times" align="right" width="6"></td> <td style="FONT-FAMILY: times" width="28"></td> <td style="FONT-FAMILY: times" width="12"></td> <td style="FONT-FAMILY: times" align="right" width="6"></td> <td style="FONT-FAMILY: times" width="28"></td> <td style="FONT-FAMILY: times" width="12"></td></tr> <tr style="HEIGHT: 0px" valign="bottom"> <th style="FONT-FAMILY: times" align="left">Year Ended December 31, </th> <th style="FONT-FAMILY: times"> </th> <th style="FONT-FAMILY: times" align="center" colspan="2">2009 </th> <th style="FONT-FAMILY: times"> </th> <th style="FONT-FAMILY: times" align="center" colspan="2">2008 </th> <th style="FONT-FAMILY: times"> </th> <th style="FONT-FAMILY: times" align="center" colspan="2">2007 </th> <th style="FONT-FAMILY: times"> </th></tr> <tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="bottom"> <th style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" align="center" colspan="10"> </th> <th style="FONT-FAMILY: times"> </th></tr> <tr style="HEIGHT: 0px" valign="bottom"> <th style="FONT-FAMILY: times" align="left">  </th> <th style="FONT-FAMILY: times"> </th> <th style="FONT-FAMILY: times" align="center" colspan="8">(In millions) </th> <th style="FONT-FAMILY: times"> </th></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times" valign="bottom"> Non-dilutive stock options</td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom" align="right">5.1</td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom" align="right">2.6</td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom" align="right"></td> <td style="FONT-FAMILY: times" valign="bottom"> </td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="white"> <td style="FONT-FAMILY: times" valign="bottom"> Dilutive common stock equivalent shares</td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom" align="right">1.0</td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom" align="right">5.5</td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom" align="right">2.3</td> <td style="FONT-FAMILY: times" valign="bottom"> </td></tr></table></div> </div></td></tr></table>  Year Ended December 31,   2009   2008   2007           (In false false false us-types:textBlockItemType textblock Schedule of non-dilutive stock options and dilutive common stock equivalent shares. No authoritative reference available. false 8 Schedule of estimated useful lives of assets other than electric generating, transmission and distribution, gas distribution facilities and oil and gas exploitation and production activities 1 ceg_ScheduleDisclosingEstimatedUsefulLivesOfAssetsTextBlock ceg false na duration This element represents the estimated useful lives of assets other than electric generating, transmission and distribution,... false false false false false false false false false false false terselabel false 1 false false false false 0 0 <table style="font-size:10pt; font-family:'Times New Roman',times,serif;"> <tr> <td> <div style="PADDING-RIGHT: 0pt; PADDING-LEFT: 0pt; PADDING-BOTTOM: 0pt; MARGIN-LEFT: 10%; WIDTH: 80%; PADDING-TOP: 0pt; POSITION: relative">   <div align="center"> <table cellspacing="0" cellpadding="0" width="100%" border="0"> <tr style="HEIGHT: 0px"> <td style="FONT-FAMILY: times" align="left"></td> <td style="FONT-FAMILY: times" width="12"></td> <td style="FONT-FAMILY: times" align="right" width="108"></td></tr> <tr style="HEIGHT: 0px" valign="bottom"> <th style="FONT-FAMILY: times" align="left">Asset </th> <th style="FONT-FAMILY: times"> </th> <th style="FONT-FAMILY: times" align="center">Estimated Useful Lives </th></tr> <tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="bottom"> <th style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" align="center" colspan="3"> </th></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times" valign="bottom"> Building and improvements</td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom" align="right">5 - 50 years</td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="white"> <td style="FONT-FAMILY: times" valign="bottom"> Office equipment and furniture</td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom" align="right">3 - 20 years</td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times" valign="bottom"> Transportation equipment</td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom" align="right">5 - 15 years</td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="white"> <td style="FONT-FAMILY: times" valign="bottom"> Computer software</td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom" align="right">3 - 10 years</td></tr></table></div> </div></td></tr></table>  Asset   Estimated Useful Lives   Building and improvements   5 - 50 years Office false false false us-types:textBlockItemType textblock This element represents the estimated useful lives of assets other than electric generating, transmission and distribution, gas distribution facilities and oil and gas exploitation and production activities. These assets are depreciated primarily using the straight-line method. No authoritative reference available. false 9 Schedule of changes in "Asset retirement obligations" liability 1 ceg_ScheduleDisclosingAssetRetirementObligationsTextBlock ceg false na duration This element represents the increases and decreases in the carrying amount of the asset retirement obligation during the... false false false false false false false false false false false terselabel false 1 false false false false 0 0 <table style="font-size:10pt; font-family:'Times New Roman',times,serif;"> <tr> <td> <div style="PADDING-RIGHT: 0pt; PADDING-LEFT: 0pt; PADDING-BOTTOM: 0pt; MARGIN-LEFT: 10%; WIDTH: 80%; PADDING-TOP: 0pt; POSITION: relative">   <div align="center"> <table cellspacing="0" cellpadding="0" width="100%" border="0"> <tr style="HEIGHT: 0px"> <td style="FONT-FAMILY: times" align="left"></td> <td style="FONT-FAMILY: times" width="12"></td> <td style="FONT-FAMILY: times" align="right" width="6"></td> <td style="FONT-FAMILY: times" width="59"></td> <td style="FONT-FAMILY: times" width="12"></td></tr> <tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="bottom"> <th style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" align="center" colspan="4"> </th> <th style="FONT-FAMILY: times"> </th></tr> <tr style="HEIGHT: 0px" valign="bottom"> <th style="FONT-FAMILY: times" align="left">  </th> <th style="FONT-FAMILY: times"> </th> <th style="FONT-FAMILY: times" align="center" colspan="2">(In millions) </th> <th style="FONT-FAMILY: times"> </th></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times" valign="bottom"> Liability at January 1, 2009</td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom" align="right">$</td> <td style="FONT-FAMILY: times" valign="bottom" align="right">987.3</td> <td style="FONT-FAMILY: times" valign="bottom"> </td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="white"> <td style="FONT-FAMILY: times" valign="bottom"> Accretion expense</td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom" align="right">62.3</td> <td style="FONT-FAMILY: times" valign="bottom"> </td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times" valign="bottom"> Liabilities incurred</td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom" align="right">0.2</td> <td style="FONT-FAMILY: times" valign="bottom"> </td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="white"> <td style="FONT-FAMILY: times" valign="bottom"> Liabilities settled</td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom" align="right">(1.0</td> <td style="FONT-FAMILY: times" valign="bottom">)</td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times" valign="bottom"> Revisions to cash flows</td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom" align="right">5.8</td> <td style="FONT-FAMILY: times" valign="bottom"> </td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="white"> <td style="FONT-FAMILY: times" valign="bottom"> Deconsolidation of CENG</td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom" align="right">(1,025.2</td> <td style="FONT-FAMILY: times" valign="bottom">)</td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="#CCEEFF"> <td style="FONT-FAMILY: times" valign="bottom"> Other</td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom" align="right">(0.1</td> <td style="FONT-FAMILY: times" valign="bottom">)</td></tr> <tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="top"> <td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" valign="bottom" colspan="4"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td></tr> <tr style="HEIGHT: 0px" valign="top" bgcolor="white"> <td style="FONT-FAMILY: times" valign="bottom"> Liability at December 31, 2009</td> <td style="FONT-FAMILY: times" valign="bottom"> </td> <td style="FONT-FAMILY: times" valign="bottom" align="right">$</td> <td style="FONT-FAMILY: times" valign="bottom" align="right">29.3</td> <td style="FONT-FAMILY: times" valign="bottom"> </td></tr> <tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="top"> <td style="BORDER-BOTTOM: #000000 2.25pt double; FONT-FAMILY: times" valign="bottom" colspan="4"> </td> <td style="FONT-FAMILY: times" valign="bottom"> </td></tr></table></div> </div></td></tr></table>          (In millions)   Liability at January 1, false false false us-types:textBlockItemType textblock This element represents the increases and decreases in the carrying amount of the asset retirement obligation during the period. No authoritative reference available. false 1 8 false UnKnown UnKnown UnKnown false true