2.2.0.7 true CONSOLIDATED STATEMENTS OF INCOME (LOSS) (Constellation Energy Group, Inc. and Subsidiaries) (USD $) 0010 - Statement - CONSOLIDATED STATEMENTS OF INCOME (LOSS) (Constellation Energy Group, Inc. and Subsidiaries) true false In Millions, except Per Share data 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 $ false 2 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 USDPerShare Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 $ false 3 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 $ 5 Revenues 3 us-gaap_RevenuesAbstract us-gaap true 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 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 6 Nonregulated revenues 4 us-gaap_SalesRevenueFromEnergyCommoditiesAndServices us-gaap true credit duration No definition available. false false false false false false false false false false false terselabel false 1 true true false false 12024300000 12024.3 false false false 2 true true false false 16057600000 16057.6 false false false 3 true true false false 17786500000 17786.5 false false false xbrli:monetaryItemType monetary Revenue derived from energy-related services such supplying various forms of energy (such as steam, electricity and chilled water from the operation of on-site facilities or cogeneration plants), procurement services provided to energy purchasers, and the marketing and trading of energy commodities and derivatives. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 false 7 Regulated electric revenues 4 us-gaap_ElectricDomesticRegulatedRevenue us-gaap true credit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 2820700000 2820.7 false false false 2 false true false false 2679500000 2679.5 false false false 3 false true false false 2455600000 2455.6 false false false xbrli:monetaryItemType monetary Revenue derived from the regulated (by a federal, state, or local government or agency) generation, transmission and distribution of electricity. No authoritative reference available. false 8 Regulated gas revenues 4 us-gaap_GasDomesticRegulatedRevenue us-gaap true credit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 753800000 753.8 false false false 2 false true false false 1004800000 1004.8 false false false 3 false true false false 943000000 943.0 false false false xbrli:monetaryItemType monetary Revenue derived from the regulated (by a federal, state, or local government or agency) generation, transmission and distribution of [natural] gas. No authoritative reference available. false 9 Total revenues 4 us-gaap_Revenues us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 15598800000 15598.8 false false false 2 false true false false 19741900000 19741.9 false false false 3 false true false false 21185100000 21185.1 false false false xbrli:monetaryItemType monetary Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 true 10 Expenses 3 us-gaap_CostsAndExpensesAbstract us-gaap true 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 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 11 Fuel and purchased energy expenses 4 us-gaap_CostOfGoodsAndServicesEnergyCommoditiesAndServices us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 11135600000 11135.6 false false false 2 false true false false 15521300000 15521.3 false false false 3 false true false false 16473900000 16473.9 false false false xbrli:monetaryItemType monetary Total costs incurred and are directly related to energy commodities and services provided during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 2 -Article 5 false 12 Operating expenses 4 us-gaap_OperatingExpenses us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 2228000000 2228.0 false false false 2 false true false false 2378800000 2378.8 false false false 3 false true false false 2447400000 2447.4 false false false xbrli:monetaryItemType monetary Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense. No authoritative reference available. false 13 Merger termination and strategic alternatives costs 4 ceg_MergerAndStrategicAlternativesCosts ceg false debit duration Amount of costs related to a merger and our pursuit of other strategic alternatives to the merger that were charged to... false false false false false false false false false false false terselabel false 1 false true false false 145800000 145.8 false false false 2 false true false false 1204400000 1204.4 false false false 3 false false false false 0 0     false false false xbrli:monetaryItemType monetary Amount of costs related to a merger and our pursuit of other strategic alternatives to the merger that were charged to expense during the period. No authoritative reference available. false 14 Impairment losses and other costs 4 us-gaap_AssetImpairmentCharges us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 124700000 124.7 false false false 2 false true false false 741800000 741.8 false false false 3 false true false false 20200000 20.2 false false false xbrli:monetaryItemType monetary The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 45, 46, 47 false 15 Workforce reduction costs 4 us-gaap_SeveranceCosts us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 12600000 12.6 false false false 2 false true false false 22200000 22.2 false false false 3 false true false false 2300000 2.3 false false false xbrli:monetaryItemType monetary The charge against earnings in the period for known and estimated costs of termination benefits provided to current employees that are involuntarily terminated under a benefit arrangement associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding costs or losses pertaining to an entity newly acquired in a business combination or a discontinued operation as defined by generally accepted accounting principles and costs associated with one-time termination benefits. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5-8 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 146 -Paragraph 8-13, 20 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS146-1 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 112 -Paragraph 7 false 16 Depreciation, depletion, and amortization 4 us-gaap_DepreciationAndAmortization us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 589100000 589.1 false false false 2 false true false false 583200000 583.2 false false false 3 false true false false 557800000 557.8 false false false xbrli:monetaryItemType monetary The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 false 17 Accretion of asset retirement obligations 4 us-gaap_AssetRetirementObligationAccretionExpense us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 62300000 62.3 false false false 2 false true false false 68400000 68.4 false false false 3 false true false false 68300000 68.3 false false false xbrli:monetaryItemType monetary Amount of accretion expense recognized in the income statement during the period that is associated with asset retirement obligations. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. Such accretion expense representing changes in the liability for an asset retirement obligation due to passage of time is the result of applying an interest method of allocation to the amount of the liability at the beginning of the period. The interest rate used to measure that change shall be the credit-adjusted risk-free rate that existed when the liability, or portion thereof, was initially measured. That amount shall be recognized as an increase in the carrying amount of the liability and as an expense classified as an operating item in the statement of income. Accretion expense shall not be considered to be interest cost for purposes of capitalization of interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 143 -Paragraph 13, 14 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 143 -Paragraph 22 -Subparagraph c(3) false 18 Taxes other than income taxes 4 us-gaap_TaxesExcludingIncomeAndExciseTaxes us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 290400000 290.4 false false false 2 false true false false 301800000 301.8 false false false 3 false true false false 288900000 288.9 false false false xbrli:monetaryItemType monetary All taxes not related to income of the entity or excise or sales taxes levied on the revenue of the entity that are not reported elsewhere. These taxes could include production, real estate, personal property, and pump tax. No authoritative reference available. false 19 Total expenses 4 us-gaap_CostsAndExpenses us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 14588500000 14588.5 false false false 2 false true false false 20821900000 20821.9 false false false 3 false true false false 19858800000 19858.8 false false false xbrli:monetaryItemType monetary Total costs of sales and operating expenses for the period. No authoritative reference available. true 20 Equity Investment (Losses) Earnings 3 us-gaap_IncomeLossFromEquityMethodInvestments us-gaap true credit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false -6100000 -6.1 false false false 2 false true false false 76400000 76.4 false false false 3 false true false false 8100000 8.1 false false false xbrli:monetaryItemType monetary This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. Such amount typically reflects adjustments similar to those made in preparing consolidated statements, including adjustments to eliminate intercompany gains and losses, and to amortize, if appropriate, any difference between cost and underlying equity in net assets of the investee at the date of investment. 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No authoritative reference available. false 22 Net (Loss) Gain on Divestitures 3 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal us-gaap true credit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false -468800000 -468.8 false false false 2 false true false false 25500000 25.5 false false false 3 false false false false 0 0 false false false xbrli:monetaryItemType monetary The gain (loss) resulting from the sale of a disposal group that is not a discontinued operation. It is included in income from continuing operations before income taxes in the income statement. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 47 -Subparagraph b Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 37, 45 false 23 Income (Loss) from Operations 3 us-gaap_OperatingIncomeLoss us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 7981000000 7981.0 false false false 2 false true false false -978100000 -978.1 false false false 3 false true false false 1334400000 1334.4 false false false xbrli:monetaryItemType monetary The net result for the period of deducting operating expenses from operating revenues. No authoritative reference available. true 24 Gain on Sales of CEP LLC Equity 3 us-gaap_GainLossOnSaleOfStockInSubsidiaryOrEquityMethodInvestee us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 63300000 63.3 false false false xbrli:monetaryItemType monetary Gain or loss on entity's disposition of equity in securities of subsidiaries or 50 percent or less owned persons. Reflects the difference in the parent company's carrying amount of the equity interest in the subsidiary (or equity method investee) immediately before and after all stock transactions. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Subparagraph g -Article 9 false 25 Other (Expense) Income 3 us-gaap_NonoperatingIncomeExpense us-gaap true credit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false -140700000 -140.7 false false false 2 false true false false -69500000 -69.5 false false false 3 false true false false 157400000 157.4 false false false xbrli:monetaryItemType monetary The aggregate amount of income (expense) from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 false 26 Fixed Charges 3 ceg_FixedChargesAbstract 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 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 27 Interest expense 4 us-gaap_InterestCostsIncurred us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 437200000 437.2 false false false 2 false true false false 399100000 399.1 false false false 3 false true false false 311800000 311.8 false false false xbrli:monetaryItemType monetary Total interest costs incurred during the period and either capitalized or charged against earnings. 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No authoritative reference available. false 29 Total fixed charges 4 ceg_FixedCharges ceg false debit duration The aggregate interest expense incurred on all borrowings, net of capitalized interest and allowance for borrowed funds used... false false false false false false false false false false false totallabel false 1 false true false false 350100000 350.1 false false false 2 false true false false 349100000 349.1 false false false 3 false true false false 292400000 292.4 false false false xbrli:monetaryItemType monetary The aggregate interest expense incurred on all borrowings, net of capitalized interest and allowance for borrowed funds used during construction. No authoritative reference available. true 30 Income (Loss) from Continuing Operations Before Income Taxes 3 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 7490200000 7490.2 false false false 2 false true false false -1396700000 -1396.7 false false false 3 false true false false 1262700000 1262.7 false false false xbrli:monetaryItemType monetary Sum of operating profit and nonoperating income (expense) before income (loss) from equity method investments, income taxes, extraordinary items, cumulative effects of changes in accounting principles, and noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 1(i) -Article 4 true 31 Income Tax Expense (Benefit) 3 us-gaap_IncomeTaxExpenseBenefit us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 2986800000 2986.8 false false false 2 false true false false -78300000 -78.3 false false false 3 false true false false 428300000 428.3 false false false xbrli:monetaryItemType monetary The sum of the current income tax expense (benefit) and the deferred income tax expense (benefit) pertaining to continuing operations. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 true 33 Loss from discontinued operations, net of income taxes of $1.5 3 us-gaap_DiscontinuedOperationAmountOfAdjustmentToPriorPeriodGainLossOnDisposalNetOfTax us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false -900000 -0.9 false false false xbrli:monetaryItemType monetary Adjustment, net of tax, to an amount previously reported in discontinued operations that is directly related to the disposal of the component in a prior period. Examples of circumstances leading to such adjustments include the resolution of contingencies relating to the terms of the disposal transaction or relating to the operations of the component prior to its disposal, and the settlement of certain employee benefit plan obligations. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 44 false 34 Net Income (Loss) 3 us-gaap_ProfitLoss us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 4503400000 4503.4 false false false 2 false true false false -1318400000 -1318.4 false false false 3 false true false false 833500000 833.5 false false false xbrli:monetaryItemType monetary The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. 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No authoritative reference available. false 36 Net Income (Loss) Attributable to Common Stock 3 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 true true false false 4443400000 4443.4 false false false 2 true true false false -1314400000 -1314.4 false false false 3 true true false false 821500000 821.5 false false false xbrli:monetaryItemType monetary Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 9 true 37 Average Shares of Common Stock Outstanding-Basic (in shares) 3 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic us-gaap true na duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 199300000 199.3 false false false 2 false true false false 179100000 179.1 false false false 3 false true false false 180200000 180.2 false false false xbrli:sharesItemType shares Number of [basic] shares, after adjustment for contingently issuable shares and other shares not deemed outstanding, determined by relating the portion of time within a reporting period that common shares have been outstanding to the total time in that period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 171 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph a Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 8 false 38 Average Shares of Common Stock Outstanding-Diluted (in shares) 3 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding us-gaap true na duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 200300000 200.3 false false false 2 false true false false 179100000 179.1 false false false 3 false true false false 182500000 182.5 false false false xbrli:sharesItemType shares The average number of shares issued and outstanding that are used in calculating diluted EPS, determined based on the timing of issuance of shares in the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph a Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 8 false 39 Earnings (Loss) Per Common Share from Continuing Operations - Basic (in dollars per share) 3 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare us-gaap true na duration No definition available. false false false false false false false false false false false terselabel true 1 true true false false 22.29 22.29 false false false 2 true true false false -7.34 -7.34 false false false 3 true true false false 4.56 4.56 false false false us-types:perShareItemType decimal The amount of income (loss) from continuing operations per each share of common stock outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 36, 37, 38 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 false 40 Loss from discontinued operations (in dollars per share) 3 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare us-gaap true na duration No definition available. false false false false false false false false false false false terselabel true 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 true true false false -0.01 -0.01 false false false us-types:perShareItemType decimal The amount of income (loss) from disposition of discontinued operations, net of related tax effect, per each share of common stock outstanding during the reporting period. 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