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Stock-Based Compensation Plans - Schedule of Stock-based Compensation Expense (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 23, 2016
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Allocated Share-based Compensation Expense     $ 175 $ 119 $ 127
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense     (68) (46) (47)
Allocated Share-based Compensation Expense, Net of Tax     107 73 80
Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Allocated Share-based Compensation Expense     93 41 59
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense     (18) (18) (11)
Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Allocated Share-based Compensation Expense     75 71 61
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense     (27) (30) (17)
Employee Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Allocated Share-based Compensation Expense     0 1 2
Stock Compensation Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Allocated Share-based Compensation Expense     7 6 5
Successor [Member] | Pepco Holdings LLC [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Allocated Share-based Compensation Expense   $ 4      
Predecessor [Member] | Pepco Holdings LLC [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Allocated Share-based Compensation Expense $ 3     13 18
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense (1)     (5) (7)
Allocated Share-based Compensation Expense, Net of Tax 2     8 11
Predecessor [Member] | Pepco Holdings LLC [Member] | Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Allocated Share-based Compensation Expense 1     5 8
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense 0     (5) (4)
Predecessor [Member] | Pepco Holdings LLC [Member] | Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Allocated Share-based Compensation Expense 2     7 5
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense 0     (2) (3)
Predecessor [Member] | Pepco Holdings LLC [Member] | Employee Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Allocated Share-based Compensation Expense 0     1 5
Corporate, Non-Segment [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Allocated Share-based Compensation Expense [2]     81 [1] 43 60
Corporate, Non-Segment [Member] | Pepco Holdings LLC [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Allocated Share-based Compensation Expense $ 3   $ 7 [1],[2] $ 13 [2] $ 18 [2]
[1] 's stock-based compensation expense for the year ended December 31, 2016 and for the period January 1, 2016 through March 23, 2016 was not material. PHI's stock-based compensation expense for the year ended December 31, 2016 includes $3 million of costs incurred prior to the closing of Exelon’s merger with PHI on March 23, 2016.
[2] These amounts primarily represent amounts billed to Exelon’s subsidiaries through intercompany allocations. These amounts are not included in the Generation, ComEd, PECO, BGE or PHI amounts above.