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Derivative Financial Instruments - Summary of Interest Rate and Foreign Currency Hedges (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Derivative [Line Items]    
Mark-to-market derivative assets (current assets) $ 917 $ 1,365
Mark-to-market derivative assets (noncurrent assets) 492 758
Derivative Liability, Current 282 205
Derivative Liability, Noncurrent 392 374
Total mark-to-market derivative net assets (liabilities) 1 5
Exelon Generation Co L L C [Member]    
Derivative [Line Items]    
Mark-to-market derivative assets (current assets) 917 1,365
Mark-to-market derivative assets (noncurrent assets) 476 733
Derivative Liability, Current 263 182
Derivative Liability, Noncurrent 153 150
Interest Rate Swap [Member]    
Derivative [Line Items]    
Mark-to-market derivative assets (current assets) 8 15
Mark-to-market derivative assets (noncurrent assets) 20 39
Total mark-to-market derivative assets 28 54
Derivative Liability, Current 8 8
Derivative Liability, Noncurrent 4 8
Derivative Liability 12 16
Total mark-to-market derivative net assets (liabilities) 16 38
Interest Rate Swap [Member] | Exelon Generation Co L L C [Member]    
Derivative [Line Items]    
Mark-to-market derivative assets (current assets) 8 15
Mark-to-market derivative assets (noncurrent assets) 4 14
Total mark-to-market derivative assets 12 29
Derivative Liability, Current 8 8
Derivative Liability, Noncurrent 4 8
Derivative Liability 12 16
Total mark-to-market derivative net assets (liabilities) 0 13
Derivative [Member]    
Derivative [Line Items]    
Mark-to-market derivative assets (current assets) 909 1,350
Mark-to-market derivative assets (noncurrent assets) 472 719
Total mark-to-market derivative assets 1,381 2,069
Derivative Liability, Current 274 197
Derivative Liability, Noncurrent 388 366
Derivative Liability 662 563
Total mark-to-market derivative net assets (liabilities) 719 1,506
Derivative [Member] | Exelon Generation Co L L C [Member]    
Derivative [Line Items]    
Mark-to-market derivative assets (current assets) 909 [1] 1,350 [2]
Mark-to-market derivative assets (noncurrent assets) 472 [1] 719 [2]
Total mark-to-market derivative assets 1,381 [1] 2,069 [2]
Derivative Liability, Current 255 [1] 174 [2]
Derivative Liability, Noncurrent 149 [1] 142 [2]
Derivative Liability 404 [1] 316 [2]
Total mark-to-market derivative net assets (liabilities) 977 [1] 1,753 [2]
Proprietary Trading [Member] | Exelon Generation Co L L C [Member]    
Derivative [Line Items]    
Mark-to-market derivative assets (current assets) 55 108
Mark-to-market derivative assets (noncurrent assets) 21 22
Total mark-to-market derivative assets 76 130
Derivative Liability, Current 54 94
Derivative Liability, Noncurrent 25 33
Derivative Liability 79 127
Total mark-to-market derivative net assets (liabilities) (3) 3
Collateral and Netting | Exelon Generation Co L L C [Member]    
Derivative [Line Items]    
Mark-to-market derivative assets (current assets) (2,769) [3] (3,994)
Mark-to-market derivative assets (noncurrent assets) (1,016) [3] (1,163)
Total mark-to-market derivative assets (3,785) [3] (5,157)
Derivative Liability, Current (2,964) [3] (4,827)
Derivative Liability, Noncurrent (1,150) [3] (1,564)
Derivative Liability (4,114) [3] (6,391)
Total mark-to-market derivative net assets (liabilities) 329 [3] 1,234
Collateral and Netting | Interest Rate Swap [Member] | Exelon Generation Co L L C [Member]    
Derivative [Line Items]    
Mark-to-market derivative assets (current assets) (13) (5) [4]
Mark-to-market derivative assets (noncurrent assets) (8) (1) [4]
Total mark-to-market derivative assets (21) (6) [4]
Derivative Liability, Current (14) (11) [4]
Derivative Liability, Noncurrent (9) (4) [4]
Derivative Liability (23) (15) [4]
Total mark-to-market derivative net assets (liabilities) 2 9 [4]
Other Segments [Member] | Interest Rate Swap [Member]    
Derivative [Line Items]    
Mark-to-market derivative assets (current assets)   0
Mark-to-market derivative assets (noncurrent assets)   25
Total mark-to-market derivative assets   25
Derivative Liability, Current   0
Derivative Liability, Noncurrent   0
Derivative Liability   0
Total mark-to-market derivative net assets (liabilities)   25
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]    
Derivative [Line Items]    
Mark-to-market derivative assets (current assets) 0  
Mark-to-market derivative assets (noncurrent assets) 16  
Total mark-to-market derivative assets 16  
Derivative Liability, Current 0  
Derivative Liability, Noncurrent 0  
Derivative Liability 0  
Total mark-to-market derivative net assets (liabilities) 16  
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Exelon Generation Co L L C [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 7 8
Derivative Liability, Noncurrent 3 8
Derivative Liability 10 16
Total mark-to-market derivative net assets (liabilities) (10) (16)
Designated as Hedging Instrument [Member] | Currency Swap [Member] | Exelon Generation Co L L C [Member]    
Derivative [Line Items]    
Mark-to-market derivative assets (current assets) 17 10
Mark-to-market derivative assets (noncurrent assets) 11 10
Total mark-to-market derivative assets 28 20
Derivative Liability, Current 13 2
Derivative Liability, Noncurrent 8 1
Derivative Liability 21 3
Total mark-to-market derivative net assets (liabilities) 7 17
Designated as Hedging Instrument [Member] | Other Segments [Member] | Interest Rate Swap [Member]    
Derivative [Line Items]    
Mark-to-market derivative assets (current assets)   0
Mark-to-market derivative assets (noncurrent assets)   25
Total mark-to-market derivative assets   25
Derivative Liability, Current   0
Derivative Liability, Noncurrent   0
Derivative Liability   0
Total mark-to-market derivative net assets (liabilities)   25
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Exelon Generation Co L L C [Member]    
Derivative [Line Items]    
Mark-to-market derivative assets (current assets) [5] 4 10
Mark-to-market derivative assets (noncurrent assets) [5] 1 5
Total mark-to-market derivative assets [5] 5 15
Derivative Liability, Current [5] 2 9
Derivative Liability, Noncurrent [5] 2 3
Derivative Liability [5] 4 12
Total mark-to-market derivative net assets (liabilities) [5] $ 1 $ 3
[1] 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.
[2] Current and noncurrent assets are shown net of collateral of $352 million and $180 million, respectively, and current and noncurrent liabilities are shown net of collateral of $480 million and $222 million, respectively. The total cash collateral posted, net of cash collateral received and offset against mark-to-market assets and liabilities was $1,234 million at December 31, 2015.
[3] Exelon, Generation, PHI and DPL net all available amounts allowed under the derivative accounting 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.
[4] Exelon and Generation net all available amounts allowed under the derivative accounting 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 accrued interest, 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.
[5] Generation enters into interest rate derivative contracts to economically hedge risk associated with the interest rate component of commodity positions. The characterization of the interest rate derivative contracts between the proprietary trading activity in the above table is driven by the corresponding characterization of the underlying commodity position that gives rise to the interest rate exposure. Generation does not utilize proprietary trading interest rate derivatives with the objective of benefiting from shifts or changes in market interest rates.