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false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:stringItemType string No definition available. false 6 Target Allocation (in hundredths) 4 ceg_DefinedBenefitPlanTargetAllocationPercentageOfAssets ceg false na instant Target allocation percentage of investments to total plan assets presented on a weighted-average basis as of the measurement... false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false true false false 0.48 0.48 true false false 3 false false false false 0 0 true false false 4 false true false false 0.30 0.30 true false false 5 false false false false 0 0 true false false 6 false true false false 0.15 0.15 true false false 7 false false false false 0 0 true false false 8 false true false false 0.07 0.07 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false true false false 1.00 1.00 true false false 12 false false false false 0 0 true false false us-types:percentItemType pure Target allocation percentage of investments to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position. No authoritative reference available. false 7 Actual Allocation (in hundredths) 4 us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations us-gaap true na instant No definition available. false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false true false false 0.57 0.57 true false false 3 false true false false 0.57 0.57 true false false 4 false true false false 0.27 0.27 true false false 5 false true false false 0.26 0.26 true false false 6 false true false false 0.07 0.07 true false false 7 false true false false 0.11 0.11 true false false 8 false true false false 0.07 0.07 true false false 9 false true false false 0.06 0.06 true false false 10 false true false false 0.02 0.02 true false false 11 false true false false 1.00 1.00 true false false 12 false true false false 1.00 1.00 true false false us-types:percentItemType pure The aggregate percentage of the fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of total plan assets held as of the measurement date. 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No authoritative reference available. false 9 Percentage of Global equity securities actively invested (in hundredths) 4 ceg_DefinedBenefitPlanTargetAllocationInGlobalEquitySecuritiesActivelyInvested ceg false na duration This element represents the percentage of global equity securities that are actively invested. false false false false false false false false false false false terselabel false 1 false false false false 0 0     false false false 2 false true false false 0.50 0.50 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false us-types:percentItemType pure This element represents the percentage of global equity securities that are actively invested. No authoritative reference available. false 12 5 false UnKnown UnKnown UnKnown false true