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Common Stock - Balance Sheet Classification of Obligations related to Outstanding Performance Share Awards Not Yet Settled (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Common Stock [Abstract]    
Current liabilities $ 28exc_ClassificationOfObligationsRelatedToOutstandingPerformanceShareAwardsNotYetSettledCurrentLiabilities [1] $ 13exc_ClassificationOfObligationsRelatedToOutstandingPerformanceShareAwardsNotYetSettledCurrentLiabilities [1]
Deferred credits and other liabilities 36exc_ClassificationOfObligationsRelatedToOutstandingPerformanceShareAwardsNotYetSettledDeferredCreditsAndOtherLiabilities [2] 24exc_ClassificationOfObligationsRelatedToOutstandingPerformanceShareAwardsNotYetSettledDeferredCreditsAndOtherLiabilities [2]
Common stock 33exc_ClassificationOfObligationsRelatedToOutstandingPerformanceShareAwardsNotYetSettledCommonStock 32exc_ClassificationOfObligationsRelatedToOutstandingPerformanceShareAwardsNotYetSettledCommonStock
Total $ 97exc_TotalBalanceSheetClassificationOfObligationsRelatedToOutstandingPerformanceShareAwardsNotYetSettled $ 69exc_TotalBalanceSheetClassificationOfObligationsRelatedToOutstandingPerformanceShareAwardsNotYetSettled
[1] Represents the current liability related to performance share awards expected to be settled in cash.
[2] Represents the long-term liability related to performance share awards expected to be settled in cash.