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Fair Value of Financial Assets and Liabilities Fair Value of Financial Assets and Liabilities - Fair Value Reconciliation of Level 3 Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 23, 2016
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2017
Dec. 31, 2015
Fair Value, Inputs, Level 3 [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 20 $ 1,015 $ 993   $ 1,529
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   (81) (557)    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Included In Noncurrent Payables To Affiliates   0 0    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Nuclear Decommissioning Payable   (8)      
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Included In Regulatory assets   8 5    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Change In Collateral   20 (141)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   248 494    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales   (16) (15)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances   (1) (3)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements   (110) (144)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3   (6) 2    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3   (61) (197)    
FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisOtherMiscellaneous   29      
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)   261 116    
Fair Value, Inputs, Level 3 [Member] | Consolidation, Eliminations [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   0 0   0
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   0 0    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Included In Noncurrent Payables To Affiliates   (6) (16)    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Nuclear Decommissioning Payable   0      
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Included In Regulatory assets   6 16    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Change In Collateral   0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales   0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances   0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements   0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3   0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3   0 0    
FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisOtherMiscellaneous   0      
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)   0 0    
Exelon Generation Co L L C [Member] | Fair Value, Inputs, Level 3 [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   1,249 1,231   1,776
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   (84) (560)    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Included In Noncurrent Payables To Affiliates   6 16    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Nuclear Decommissioning Payable   (8)      
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   20 (141)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   248 494    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales   (16) (15)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances   0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements   (110) (144)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3   (6) 2    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3   (61) (197)    
FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisOtherMiscellaneous   29      
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)   258 114    
Exelon Generation Co L L C [Member] | Fair Value, Inputs, Level 3 [Member] | Nuclear Decommissioning Trust Fund Investments [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   648 677   670
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   3 7    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Included In Noncurrent Payables To Affiliates   6 16    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Nuclear Decommissioning Payable   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    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   64 143    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales   0 (1)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances   0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements   (102) (144)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3   0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3   0 (14)    
FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisOtherMiscellaneous   0      
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)   1 5    
Exelon Generation Co L L C [Member] | Fair Value, Inputs, Level 3 [Member] | Pledged Assets For Zion Station Decommissioning [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   12 19   22
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   0 0    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Included In Noncurrent Payables To Affiliates   0 0    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Nuclear Decommissioning Payable   (8)      
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    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   1 2    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales   0 (5)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances   0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements   0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3   0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3   0 0    
FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisOtherMiscellaneous   0      
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)   0 0    
Exelon Generation Co L L C [Member] | Fair Value, Inputs, Level 3 [Member] | Derivative [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   552 493   1,051
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings [1]   (90) (568)    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Included In Noncurrent Payables To Affiliates   0 0    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Nuclear Decommissioning Payable   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   20 (141)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   178 342 [2]    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales   (16) (9)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances   0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements   (8) [3] 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3   (6) 1    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3   (50) (183)    
FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisOtherMiscellaneous [4]   31      
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)   254 109    
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Abstract]          
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings   352 677    
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 Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   37 42   33
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   3 1    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Included In Noncurrent Payables To Affiliates   0 0    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Nuclear Decommissioning Payable   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    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   5 7    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales   0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances   0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements   0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3   0 1    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3   (11) 0    
FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisOtherMiscellaneous   (2)      
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)   3 0    
Commonwealth Edison Co [Member]          
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Abstract]          
Realized Investment Gains (Losses)   20 18    
Commonwealth Edison Co [Member] | Fair Value, Inputs, Level 3 [Member]          
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)   (18) (29)    
Commonwealth Edison Co [Member] | Fair Value, Inputs, Level 3 [Member] | Derivative [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   (256) (258)   (247)
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   0 0    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Included In Noncurrent Payables To Affiliates   0 0    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Nuclear Decommissioning Payable   0      
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Included In Regulatory assets [5]   2 (11)    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Change In Collateral   0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales   0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances   0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements   0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3   0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3   0 0    
FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisOtherMiscellaneous   0      
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)   0 0    
Pepco Holdings LLC [Member] | Fair Value, Inputs, Level 3 [Member] | Successor [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 0        
Pepco Holdings LLC [Member] | Fair Value, Inputs, Level 3 [Member] | 6311 Life Insurance [Member] | Successor [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 20 22 20 [6]    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   3 3 [6]    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Included In Noncurrent Payables To Affiliates   0 0 [6]    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Nuclear Decommissioning Payable   0      
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Included In Regulatory assets   0 0 [6]    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Change In Collateral   0 0 [6]    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   0 0 [6]    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales   0 0 [6]    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances   (1) (3) [6]    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements   0 0 [6]    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3   0 0 [6]    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3   0 0 [6]    
FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisOtherMiscellaneous   0      
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)   3 2 [6]    
Pepco Holdings LLC [Member] | Fair Value, Inputs, Level 3 [Member] | 6311 Life Insurance [Member] | Predecessor [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 20       19
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]          
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 Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 0       18
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]          
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 Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   22 19 $ 20 $ 19
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   3 3    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   (1) (3)    
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)   $ 3 $ 3    
[1] Includes a reduction for the reclassification of $352 million and $677 million of realized gains due to the settlement of derivative contracts for the years ended December 31, 2017 and 2016, respectively.
[2] Includes $168 million of fair value from contracts acquired as a result of portfolio acquisitions.
[3] Exelon includes the settlement value for any open contracts that were net settled prior to their scheduled maturity within this line item.
[4] As a result of the bankruptcy filing for EGTP on November 7, 2017, the net mark-to-market commodity contracts were deconsolidated from Exelon's and Generation's consolidated financial statements.
[5] Includes $18 million of decreases in fair value and an increase for realized losses due to settlements of $20 million recorded in purchased power expense associated with floating-to-fixed energy swap contracts with unaffiliated suppliers for the year ended December 31, 2017. Includes $29 million of decreases in fair value and an increase for realized losses due to settlements of $18 million recorded in purchased power expense associated with floating-to-fixed energy swap contracts with unaffiliated suppliers for the year ended December 31, 2016.
[6] Successor period represents activity from March 24, 2016 to December 31, 2016. See tables below for PHI's predecessor periods, as well as activity for Pepco for the years ended December 31, 2017 and 2016.