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Accounts Receivable - Schedule of Estimated Unbilled Revenues (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unbilled customer revenues $ 1,203 $ 1,381
Allowance for uncollectible accounts [1] (284) (311)
Exelon Generation Co L L C [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unbilled customer revenues [2] 732 823
Allowance for uncollectible accounts [1] (77) (60)
Commonwealth Edison Co [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unbilled customer revenues 218 204
Allowance for uncollectible accounts [1] (75) (84)
PECO Energy Co [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unbilled customer revenues 105 140
Allowance for uncollectible accounts [1],[3] (83) (100)
Current financing receivable allowance for credit losses 8  
Baltimore Gas and Electric Company [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unbilled customer revenues 148 214
Allowance for uncollectible accounts [1],[4] (49) $ (67)
Charged to Costs and Expenses $ 19  
[1] Includes the allowance for uncollectible accounts on customer and other accounts receivable.
[2] Represents unbilled portion of retail receivables estimated under Exelon’s unbilled critical accounting policy.
[3] the non-current allowance for uncollectible accounts of $8 million at both December 31, 2015 and 2014, related to PECO’s current installment plan receivables described below.
[4] At December 31, 2014, as explained in Note 1—Significant Accounting Policies, BGE estimated the allowance for uncollectible accounts on customer receivables by applying loss rates to the outstanding receivable balance by risk segment. The change in estimate resulted in a $19 million pre-tax charge to BGE's provision for uncollectible accounts expense for the year ended December 31, 2014, which is included in Operating and maintenance expense on BGE's Consolidated Statements of Operations and Comprehensive Income.