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Fair Value of Financial Assets and Liabilities - Fair Value Assets Liabilities Measured On Recurring Basis Unobservable Input Reconciliation (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Mar. 23, 2016
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Fair Value, Inputs, Level 3 [Member]                    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]                    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 1,070 $ 1,466 $ 20 $ 1,466 $ 1,070 $ 1,466 $ 1,098 $ 993 $ 1,185 $ 1,529
Total realized / unrealized gains (losses)                    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (80) 93     (102) (334)        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Included In Noncurrent Payables To Affiliates   0     0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Nuclear Decommissioning Payable (4) (1)     (3) 1        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Included In Regulatory assets (21) (17)     (6) 21        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Change In Collateral 11 31     81 (51)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 77 214     205 420        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales   (7)     (15) (11)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances   0     (1) (1)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (21) (28)     (85) (119)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3   0     (9) 2        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 10 (4)     12 (11)        
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 26 288     167 248        
Fair Value, Inputs, Level 3 [Member] | Consolidation, Eliminations [Member]                    
Total realized / unrealized gains (losses)                    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Included In Noncurrent Payables To Affiliates   (6)     (13) (18)        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Included In Regulatory assets 0 6     13 18        
Exelon Generation Co L L C [Member]                    
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Abstract]                    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings (96) (190)     (279) (579)        
Exelon Generation Co L L C [Member] | Fair Value, Inputs, Level 3 [Member]                    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]                    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 1,326 1,689   1,689 1,326 1,689 1,334 1,231 1,386 1,776
Total realized / unrealized gains (losses)                    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (81) 92     (104) (336)        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Included In Noncurrent Payables To Affiliates   6     13 18        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Nuclear Decommissioning Payable (4) (1)     (3) 1        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Included In Regulatory assets 0 0     0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Change In Collateral 11 31     81 (51)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 77 214     205 420        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales   (7)     (15) (11)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (21) (28)     (85) (119)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3   0     (9) 2        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 10 (4)     12 (11)        
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 25 288     165 247        
Exelon Generation Co L L C [Member] | Fair Value, Inputs, Level 3 [Member] | Nuclear Decommissioning Trust Fund Investments [Member]                    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]                    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 671 693   693 671 693 683 677 715 670
Total realized / unrealized gains (losses)                    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 (4)     4 2        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Included In Noncurrent Payables To Affiliates   6     13 18        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Nuclear Decommissioning Payable 0 0     0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Included In Regulatory assets   0       0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Change In Collateral 0 0     0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 19 4     54 123        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales   0     0 (1)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (31) (28)     (77) (119)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3   0     0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 0 0     0 0        
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 3     2 7        
Exelon Generation Co L L C [Member] | Fair Value, Inputs, Level 3 [Member] | Pledged Assets For Zion Station Decommissioning [Member]                    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]                    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 17 19   19 17 19 21 19 25 22
Total realized / unrealized gains (losses)                    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0     0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Included In Noncurrent Payables To Affiliates   0     0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Nuclear Decommissioning Payable (4) (1)     (3) 1        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Included In Regulatory assets   0       0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Change In Collateral 0 0     0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0     1 1        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales   (5)     0 (5)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0 0     0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3   0     0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 0 0     0 0        
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0     0 0        
Exelon Generation Co L L C [Member] | Fair Value, Inputs, Level 3 [Member] | Derivative [Member]                    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]                    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 595 935   935 595 935 589 493 609 1,051
Total realized / unrealized gains (losses)                    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (82) [1] 95 [2]     (110) [1] (339) [2]        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Included In Noncurrent Payables To Affiliates   0     0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Nuclear Decommissioning Payable 0 0     0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Included In Regulatory assets   0       0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Change In Collateral 11 31     81 (51)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 57 207 [3]     146 289 [3]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales   (2)     (15) (5)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 10 [4] 0     (8) [4] 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3   (1)     (9) 1        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 10 (4)     17 (11)        
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 24 285     161 240        
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Abstract]                    
Indefinite-lived Intangible Assets Acquired           168        
Exelon Generation Co L L C [Member] | Fair Value, Inputs, Level 3 [Member] | Other Investments [Member]                    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]                    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 43 42   42 43 42 41 42 37 33
Total realized / unrealized gains (losses)                    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 1 1     2 1        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Included In Noncurrent Payables To Affiliates   0     0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Nuclear Decommissioning Payable 0 0     0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Included In Regulatory assets   0       0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Change In Collateral 0 0     0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 1 3     4 7        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales   0     0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0 0     0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3   1     0 1        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 0 0     (5) 0        
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 1 0     2 0        
Commonwealth Edison Co [Member] | Derivative [Member] | Interest Rate Swap [Member]                    
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Abstract]                    
Realized Investment Gains (Losses) 3 2     13 13        
Commonwealth Edison Co [Member] | Fair Value, Inputs, Level 3 [Member] | Derivative [Member]                    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]                    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value (277) (244)   (244) (277) (244) (256) (258) (221) (247)
Total realized / unrealized gains (losses)                    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0     0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Included In Noncurrent Payables To Affiliates   0     0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Nuclear Decommissioning Payable 0 0     0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Included In Regulatory assets (21) [5] (23) [6]     (19) [5] 3 [6]        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Change In Collateral 0 0     0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0     0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales   0     0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0 0     0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3   0     0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 0 0     0 0        
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0     0 0        
Purchases, sales, issuances and settlements                    
Ending balance   (244)   (244)   (244)        
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Abstract]                    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) (24) (25)     (32) (10)        
Pepco Holdings LLC [Member] | Fair Value, Inputs, Level 3 [Member] | Successor [Member]                    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]                    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value [7]     20              
Pepco Holdings LLC [Member] | Fair Value, Inputs, Level 3 [Member] | Derivative [Member]                    
Total realized / unrealized gains (losses)                    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Nuclear Decommissioning Payable   0                
Pepco Holdings LLC [Member] | Fair Value, Inputs, Level 3 [Member] | 6311 Life Insurance [Member] | Successor [Member]                    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]                    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 21 21 [7] 0 [7] 21 [7] 21 21 [7] 20 20 20  
Total realized / unrealized gains (losses)                    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 1 1   2 [7] 2          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Included In Noncurrent Payables To Affiliates   0   0 [7] 0          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Nuclear Decommissioning Payable 0     0 [7] 0          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Included In Regulatory assets 0 0   0 [7] 0          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Change In Collateral 0 0   0 [7] 0          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0   0 [7] 0          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales   0   0 [7] 0          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances   0   (1) [7] (1)          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0 0   0 [7] 0          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3   0   0 [7] 0          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 0 0   0 [7] 0          
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 1 0   1 [7] 2          
Pepco Holdings LLC [Member] | Fair Value, Inputs, Level 3 [Member] | 6311 Life Insurance [Member] | Predecessor [Member]                    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]                    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value     20             19
Total realized / unrealized gains (losses)                    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings     1              
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)     1              
Pepco Holdings LLC [Member] | Fair Value, Inputs, Level 3 [Member] | Preferred Stock [Member] | Predecessor [Member]                    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]                    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value     0             18
Total realized / unrealized gains (losses)                    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings     (18)              
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)     $ 0              
Potomac Electric Power Company [Member] | Fair Value, Inputs, Level 3 [Member] | 6311 Life Insurance [Member]                    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]                    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 21 21   $ 21 21 21 $ 20 $ 20 $ 20 $ 19
Total realized / unrealized gains (losses)                    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 1 1     2 3        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances 0 0     (1) (1)        
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) $ 1 $ 0     $ 2 $ 2        
[1] Includes a reduction for the reclassification of $96 million and $279 million of realized gains due to the settlement of derivative contracts for the three and nine months ended September 30, 2017.
[2] Includes a reduction for the reclassification of $190 million and $579 million of realized gains due to the settlement of derivative contracts recorded in results of operations for the three and nine months ended September 30, 2016.
[3] Includes $168 million of fair value from contracts acquired as a result of portfolio acquisitions.
[4] Exelon includes the settlement value for any open contracts that were net settled prior to their scheduled maturity within this line item.
[5] Includes $24 million of decreases in fair value and an increase for realized losses due to settlements of $3 million recorded in purchased power expense associated with floating-to-fixed energy swap contracts with unaffiliated suppliers for the three months ended September 30, 2017. Includes $32 million of decreases in fair value and an increase for realized losses due to settlements of $13 million recorded in purchased power expense associated with floating-to-fixed energy swap contracts with unaffiliated suppliers for the nine months ended September 30, 2017.
[6] Includes $25 million of decreases in fair value and an increase for realized losses due to settlements of $2 million recorded in purchased power expense associated with floating-to-fixed energy swap contracts with unaffiliated suppliers for the three months ended September 30, 2016. Includes $10 million of decreases in fair value and an increase for realized losses due to settlements of $13 million for the nine months ended September 30, 2016.
[7] Successor period represents activity from March 24, 2016 through September 30, 2016. See tables below for PHI's predecessor periods, as well as activity for Pepco for the three and nine months ended September 30, 2017 and 2016.