XML 102 R63.htm IDEA: XBRL DOCUMENT v2.4.0.6
Derivative Financial Instruments (Interest Rate Risk) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Mar. 31, 2013
Interest Expense [Member]
Mar. 31, 2012
Interest Expense [Member]
Mar. 31, 2013
Designated as Hedging Instrument [Member]
Dec. 31, 2012
Designated as Hedging Instrument [Member]
Mar. 31, 2013
Designated as Hedging Instrument [Member]
Interest Expense [Member]
Mar. 31, 2013
Derivative [Member]
Dec. 31, 2012
Derivative [Member]
Mar. 31, 2013
Exelon Generation Co L L C [Member]
Mar. 31, 2012
Exelon Generation Co L L C [Member]
Dec. 31, 2012
Exelon Generation Co L L C [Member]
Mar. 31, 2013
Exelon Generation Co L L C [Member]
Antelope Valley Project [Member]
Mar. 31, 2013
Exelon Generation Co L L C [Member]
Designated as Hedging Instrument [Member]
Mar. 31, 2013
Exelon Generation Co L L C [Member]
Designated as Hedging Instrument [Member]
Other Solar Projects [Member]
Mar. 31, 2013
Exelon Generation Co L L C [Member]
Derivative [Member]
Mar. 31, 2013
Exelon Generation Co L L C [Member]
Derivative [Member]
Antelope Valley Project [Member]
Mar. 31, 2013
Exelon Generation Co L L C [Member]
Derivative [Member]
Interest Expense [Member]
Antelope Valley Project [Member]
Mar. 31, 2013
Exelon Generation Co L L C [Member]
Proprietary Trading [Member]
Mar. 31, 2013
Exelon Generation Co L L C [Member]
Collateral And Netting [Member]
Mar. 31, 2013
Other Segment [Member]
Designated as Hedging Instrument [Member]
Cost Of Capital Strategies [Abstract]                                            
Hypothetical increase in interest rates associated with variable-rate debt 0.50%                                          
Pre-tax net income impact associated with a hypothetical 10% increase in interest rates - exclusive upper bound $ 1                                          
Derivative Interest Rate Risk [Abstract]                                            
Mark-to-market derivative assets (current assets) 4                   4           3     19 [1] (18) [2]  
Mark-to-market derivative assets (noncurrent assets) 53               2   41       34   7     25 [1] (25) [2] 12
Total mark-to-market derivative assets 57                   45       34   10     44 [1] (43) [2] 12
Mark-to-market derivative liabilities (current liabilities) (1)                   (1)       (1)   (1)     (17) [1] 18 [2]  
Mark-to-market derivative liabilities (noncurrent liabilities) (27)                   (27)       (26)         (26) [1] 25 [2]  
Total mark-to-market derivative liabilities (28)                   (28)       (27)   (1)     (43) [1] 43 [2]  
Total mark-to-market derivative net assets (liabilities) 29                   17       7   9     1 [1] 0 [2] 12
Derivative Instruments Gain Loss Recognized In Income Net [Abstract]                                            
Gain on swaps/borrowings       (1) [3] 1 [3]                                  
Loss on swaps/borrowings       (4) [3] (3) [3]                                  
Derivative Instruments Gain Loss Recognized In Income Net Footnotes [Abstract]                                            
Fair value of interest rate swaps acquired from merger 4                                          
Interest Rate Risk - Fair Value Hedges [Abstract]                                            
Notional amounts of fair value hedges outstanding related to interest rate swaps 650   650                                      
Increase (Decrease) in Fair Value of Interest Rate Fair Value Hedging Instruments           44 49                              
Interest rate swaps previously held by acquiree 550                                          
Fair value of interest rate swaps from merger acquiree 44                                          
Notional amount of interest rate swaps acquired from merger 150                                          
Fair value of interest rate swaps acquired from merger 4                                          
Interest Rate Risk - Cash Flow Hedges [Abstract]                                            
Notional amount of interest rate cash flow hedge derivatives           800                                
Notional Amount of Pre-issuance Interest Rate Cash Flow Hedge Derivatives           394                                
Pre-tax gain/loss on interest rate cash flow hedges               (4)                            
DOE interest rate swap 485                                          
Percentage of interest rate swap in relation to DOE guarantee                     75                      
Notional amount of interest rate swap DOE advance                     273                      
Percent of DOE loan advance offset                     75.00%                      
Notional amount of remaining cash flow hedges                     211                      
Notional amounts on forward starting interest rate swaps           125               29   29            
Mark-to-market derivative liabilities 259   281             (250) 199   232         3 23      
Unrealized Gain (Loss) on Derivatives $ (388) $ 73                 $ (406) $ 63                    
[1] 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 interest rate derivatives with the objective of benefiting from shifts or changes in market interest rates.
[2] Represents the netting of fair value balances with the same counterparty and any associated cash collateral.
[3] For the three months ended March 31, 2013, the loss on the swaps in the table above includes $4 million reclassified to earnings, with an immaterial amount excluded from hedge effectiveness testing.