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Derivative Financial Instruments - Summary of Derivative Fair Value Balances (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Derivative [Line Items]    
Derivative, Collateral, Right to Reclaim Cash $ 77 $ 29
Mark-to-market derivative assets (current assets) 976 917
Mark-to-market derivative assets (noncurrent assets) 337 492
Derivative Liability, Current (232) (282)
Derivative Liability, Noncurrent 409 392
Total mark-to-market derivative net assets (liabilities) 6 1
Margin Deposit Assets (117) (158)
Exelon Generation Co L L C [Member]    
Derivative [Line Items]    
Mark-to-market derivative assets (current assets) 976 917
Mark-to-market derivative assets (noncurrent assets) 334 476
Derivative Liability, Current (211) (263)
Derivative Liability, Noncurrent 174 153
Derivative, Collateral, Obligation to Return Cash 4 8
Commonwealth Edison Co [Member]    
Derivative [Line Items]    
Derivative Liability, Current (21) (19)
Derivative Liability, Noncurrent 235 239
Commodity Contract [Member]    
Derivative [Line Items]    
Mark-to-market derivative assets (current assets) 973 909
Mark-to-market derivative assets (noncurrent assets) 331 472
Total mark-to-market derivative assets 1,304 1,381
Derivative Liability, Current (230) (274)
Derivative Liability, Noncurrent (407) (388)
Total mark-to-market derivative liabilities 637 662
Total mark-to-market derivative net assets (liabilities) 667 719
Commodity Contract [Member] | Exelon Generation Co L L C [Member]    
Derivative [Line Items]    
Mark-to-market derivative assets (current assets) 973 [1] 909 [2]
Mark-to-market derivative assets (noncurrent assets) 331 [1] 472 [2]
Total mark-to-market derivative assets 1,304 [1] 1,381 [2]
Derivative Liability, Current 209 [1] 255 [2]
Derivative Liability, Noncurrent (172) [1] (149) [2]
Total mark-to-market derivative liabilities (381) [1] (404) [2]
Total mark-to-market derivative net assets (liabilities) 923 [1] 977 [2]
Commodity Contract [Member] | Delmarva Power and Light Company [Member]    
Derivative [Line Items]    
Mark-to-market derivative assets (current assets) 0 0
Mark-to-market derivative assets (noncurrent assets) 0 0
Total mark-to-market derivative assets 0 0
Derivative Liability, Current 0 0
Derivative Liability, Noncurrent 0 0
Total mark-to-market derivative liabilities 0 0
Total mark-to-market derivative net assets (liabilities) 0 0
Commodity Contract [Member] | Pepco Holdings LLC [Member] | Successor [Member]    
Derivative [Line Items]    
Mark-to-market derivative assets (current assets) 0 0
Mark-to-market derivative assets (noncurrent assets) 0 0
Total mark-to-market derivative assets 0 0
Derivative Liability, Current 0 0
Derivative Liability, Noncurrent 0 0
Total mark-to-market derivative liabilities 0 0
Total mark-to-market derivative net assets (liabilities) 0 0
Not Designated as Hedging Instrument, Economic Hedge [Member] | Commodity Contract [Member] | Exelon Generation Co L L C [Member]    
Derivative [Line Items]    
Mark-to-market derivative assets (current assets) 3,061 3,623
Mark-to-market derivative assets (noncurrent assets) 1,164 1,467
Total mark-to-market derivative assets 4,225 5,090
Derivative Liability, Current 2,646 3,165
Derivative Liability, Noncurrent (1,137) (1,274)
Total mark-to-market derivative liabilities 3,783 4,439
Total mark-to-market derivative net assets (liabilities) 442 651
Not Designated as Hedging Instrument, Economic Hedge [Member] | Commodity Contract [Member] | Commonwealth Edison Co [Member]    
Derivative [Line Items]    
Mark-to-market derivative assets (current assets) [3] 0 0
Mark-to-market derivative assets (noncurrent assets) [3] 0 0
Total mark-to-market derivative assets [3] 0 0
Derivative Liability, Current [3] 21 19
Derivative Liability, Noncurrent [3] (235) (239)
Total mark-to-market derivative liabilities [3] (256) (258)
Total mark-to-market derivative net assets (liabilities) [3] (256) (258)
Not Designated as Hedging Instrument, Economic Hedge [Member] | Commodity Contract [Member] | Delmarva Power and Light Company [Member]    
Derivative [Line Items]    
Mark-to-market derivative assets (current assets) [4] 0 2
Mark-to-market derivative assets (noncurrent assets) [4] 0 0
Total mark-to-market derivative assets [4] 0 2
Derivative Liability, Current [4] 1 0
Derivative Liability, Noncurrent [4] 0 0
Total mark-to-market derivative liabilities [4] (1) 0
Total mark-to-market derivative net assets (liabilities) [4] (1) 2
Designated as Hedging Instrument [Member] | Exelon Generation Co L L C [Member]    
Derivative [Line Items]    
Derivative Liability, Collateral, Right to Reclaim Cash, Offset (466) (329)
Not Designated as Hedging Instrument, Trading [Member] | Commodity Contract [Member] | Exelon Generation Co L L C [Member]    
Derivative [Line Items]    
Mark-to-market derivative assets (current assets) 56 55
Mark-to-market derivative assets (noncurrent assets) 12 21
Total mark-to-market derivative assets 68 76
Derivative Liability, Current 43 54
Derivative Liability, Noncurrent 10 25
Total mark-to-market derivative liabilities (53) (79)
Total mark-to-market derivative net assets (liabilities) 15 (3)
Collateral and Netting | Commodity Contract [Member] | Exelon Generation Co L L C [Member]    
Derivative [Line Items]    
Mark-to-market derivative assets (current assets) [5] (2,144) [6] (2,769) [7]
Mark-to-market derivative assets (noncurrent assets) [5] (845) [6] (1,016) [7]
Total mark-to-market derivative assets [5] (2,989) [6] (3,785) [7]
Derivative Liability, Current [5] (2,480) [6] (2,964) [7]
Derivative Liability, Noncurrent [5] 975 [6] 1,150 [7]
Total mark-to-market derivative liabilities [5] 3,455 [6] 4,114 [7]
Total mark-to-market derivative net assets (liabilities) [5] 466 [6] 329 [7]
Collateral and Netting | Commodity Contract [Member] | Delmarva Power and Light Company [Member]    
Derivative [Line Items]    
Mark-to-market derivative assets (current assets) [5] 0 (2)
Mark-to-market derivative assets (noncurrent assets) [5] 0 0
Total mark-to-market derivative assets [5] 0 (2)
Derivative Liability, Current [5] 1 0
Derivative Liability, Noncurrent [5] 0 0
Total mark-to-market derivative liabilities [5] 1 0
Total mark-to-market derivative net assets (liabilities) [5] 1 (2)
Other Current Assets [Member] | Designated as Hedging Instrument [Member] | Exelon Generation Co L L C [Member]    
Derivative [Line Items]    
Derivative, Collateral, Right to Reclaim Cash 169 100
Margin Deposit Assets (117) (158)
Other Noncurrent Assets [Member] | Designated as Hedging Instrument [Member] | Exelon Generation Co L L C [Member]    
Derivative [Line Items]    
Derivative, Collateral, Right to Reclaim Cash 53 72
Other Current Liabilities [Member] | Designated as Hedging Instrument [Member] | Exelon Generation Co L L C [Member]    
Derivative [Line Items]    
Derivative, Collateral, Right to Reclaim Cash 167 95
Other Noncurrent Liabilities [Member] | Designated as Hedging Instrument [Member] | Exelon Generation Co L L C [Member]    
Derivative [Line Items]    
Derivative, Collateral, Right to Reclaim Cash $ 77 $ 62
[1] Current and noncurrent assets are shown net of collateral of $169 million and $53 million, respectively, and current and noncurrent liabilities are shown net of collateral of $167 million and $77 million, respectively. The total cash collateral posted, net of cash collateral received and offset against mark-to-market assets and liabilities was $466 million at December 31, 2017.
[2] Current and noncurrent assets are shown net of collateral of $100 million and $72 million, respectively, and current and noncurrent liabilities are shown net of collateral of $95 million and $62 million, respectively. The total cash collateral posted, net of cash collateral received and offset against mark-to-market assets and liabilities was $329 million at December 31, 2016.
[3] Includes current and noncurrent liabilities relating to floating-to-fixed energy swap contracts with unaffiliated suppliers.
[4] Represents natural gas futures purchased by DPL as part of a natural gas hedging program approved by the DPSC.
[5] Exelon, Generation, PHI and DPL net all available amounts allowed under the derivative authoritative guidance on the balance sheet. These amounts include unrealized derivative transactions with the same counterparty under legally enforceable master netting agreements and cash collateral. In some cases, Exelon and Generation may have other offsetting exposures, subject to a master netting or similar agreement, such as trade receivables and payables, transactions that do not qualify as derivatives, letters of credit and other forms of non-cash collateral. These are not reflected in the table above.
[6] Of the collateral posted/(received), $(117) million represents variation margin on the exchanges.
[7] Of the collateral posted/(received), $(158) million represents variation margin on the exchanges