XML 112 R87.htm IDEA: XBRL DOCUMENT v3.20.1
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
Mar. 31, 2020
Mar. 31, 2019
Fair Value, Inputs, Level 3 [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Beginning Balance $ 1,068 $ 907
Total realized / unrealized gains (losses)    
Included in net income 10 (228)
Included in noncurrent payables to affiliates 0 0
Included in regulatory assets (14) 20
Change in collateral 1 81
Purchases, sales, issuances and settlements    
Purchases 42 58
Sales (22) 0
Settlements (14) (17)
Transfers into Level 3 2 0
Transfers out of Level 3 15 17
Ending Balance 1,088 838
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 187 (148)
Fair Value, Inputs, Level 3 [Member] | Consolidation, Eliminations [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Beginning Balance 0 0
Total realized / unrealized gains (losses)    
Included in net income 0 0
Included in noncurrent payables to affiliates 1 (11)
Included in regulatory assets (1) 11
Change in collateral 0 0
Purchases, sales, issuances and settlements    
Purchases 0 0
Sales 0 0
Settlements 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Ending Balance 0 0
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 0
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 177 80
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]    
Beginning Balance 1,328 1,118
Total realized / unrealized gains (losses)    
Included in net income 9 (229)
Included in noncurrent payables to affiliates (1) 11
Included in regulatory assets 0 0
Change in collateral 1 81
Purchases, sales, issuances and settlements    
Purchases 42 58
Sales (22) 0
Settlements (14) (17)
Transfers into Level 3 2 0
Transfers out of Level 3 15 17
Ending Balance 1,360 1,039
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 186 (149)
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]    
Beginning Balance 511 543
Total realized / unrealized gains (losses)    
Included in net income (1) 2
Included in noncurrent payables to affiliates (1) 11
Included in regulatory assets 0 0
Change in collateral 0 0
Purchases, sales, issuances and settlements    
Purchases 3 1
Sales 0 0
Settlements (14) (17)
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Ending Balance 498 540
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) (1) 2
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]    
Beginning Balance 817 575
Total realized / unrealized gains (losses)    
Included in net income 10 (231)
Included in noncurrent payables to affiliates 0 0
Included in regulatory assets   0
Change in collateral 1 81
Purchases, sales, issuances and settlements    
Purchases 39 57
Sales (22) 0
Settlements 0 0
Transfers into Level 3 2 0
Transfers out of Level 3 15 17
Ending Balance 862 499
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 187 (151)
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) 10 5
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]    
Beginning Balance (301) (249)
Total realized / unrealized gains (losses)    
Included in net income 0 0
Included in noncurrent payables to affiliates 0 0
Included in regulatory assets (13) 9
Change in collateral 0 0
Purchases, sales, issuances and settlements    
Purchases 0 0
Sales 0 0
Settlements 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Ending Balance (314) (240)
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 0
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) (23) (14)
Pepco Holdings LLC [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]    
Beginning Balance 41 38
Total realized / unrealized gains (losses)    
Included in net income (1) 1
Included in noncurrent payables to affiliates 0 0
Included in regulatory assets 0 0
Change in collateral 0 0
Purchases, sales, issuances and settlements    
Purchases 0 0
Sales 0 0
Settlements 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Ending Balance 42 39
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 1 1
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]    
Beginning Balance 41 38
Total realized / unrealized gains (losses)    
Included in net income 1 1
Included in noncurrent payables to affiliates 0 0
Included in regulatory assets 0 0
Change in collateral 0 0
Purchases, sales, issuances and settlements    
Purchases 0 0
Sales 0 0
Settlements 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Ending Balance 42 39
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) $ 1 $ 1