XML 44 R67.htm IDEA: XBRL DOCUMENT v2.4.0.8
Derivative Financial Instruments (Fair Value Measurments) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Mar. 31, 2013
Jun. 30, 2012
Mar. 31, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Cash Flow Hedge Accumulated Other Comprehensive Income [Abstract]                
Ineffective portion recognized in income         $ 0      
Footnotes To Cash Flow Hedge Accumulated Other Comprehensive Income [Abstract]                
Net gain (loss) of reclassifications from accumulated OCI to net income related to settlements of block contracts           0    
Cash Flow Hedge Activity Impact [Abstract]                
Cash flow hedge activity impact on pre-tax net income based on reclassification adjustment from accumulated other comprehensive income 141   230          
Derivatives Fair Value [Line Items]                
Mark-to-market derivative assets 845       845   938  
Mark-to-market derivative assets with affiliate (current assets)             (226) [1]  
Mark-to-market derivative assets (noncurrent assets) 772       772   937  
Mark-to-market derivative liabilities (current liabilities) (147)       (147)   (352)  
Mark-to-market derivative liabilities (noncurrent liabilities) (178)       (178)   (281)  
Other Derivatives Not Designated As Hedging Instruments [Abstract]                
Change in fair value 370   72   37 176    
Reclassification to realized at settlement 48   134   (5) 106    
Net mark-to-market gains (losses) 418   206   32 282    
Operating Revenue [Member]
                
Proprietary Trading Activities [Abstract]                
Change in fair value 5   12   1 14    
Reclassification to realized at settlement (2)   31   4 32    
Net mark-to-market gains (losses) 3   43   5 46    
Derivative [Member]
                
Derivatives Fair Value [Line Items]                
Mark-to-market derivative assets 842       842   934  
Mark-to-market derivative assets (noncurrent assets) 702       702   878  
Total mark-to-market derivative assets 1,544       1,544   1,812  
Mark-to-market derivative liabilities (current liabilities) (144)       (144)   (350)  
Mark-to-market derivative liabilities (noncurrent liabilities) (164)       (164)      
Total mark-to-market derivative liabilities (308)       (308)   (600)  
Total mark-to-market derivative net assets (liabilities) 1,236       1,236   1,212  
Energy Related Hedges [Member]
                
Cash Flow Hedge Activity Impact [Abstract]                
Cash flow hedge activity impact on pre-tax net income based on reclassification adjustment from accumulated other comprehensive income         240      
Total Cash Flow Hedges [Member]
                
Cash Flow Hedge Accumulated Other Comprehensive Income [Abstract]                
Accumulated OCI derivative gain - Beginning Balance 310 368 703 488 368 488 488  
Effective portion of changes in fair value 21 [2]   (17) [3]   21 [4] 300 [5]    
Accumulated OCI derivative gain - Ending Balance 245   547   245 547    
Footnotes To Cash Flow Hedge Accumulated Other Comprehensive Income [Abstract]                
Net gains (losses) related to interest rate swaps and treasury rate locks           (23)    
Net gain (loss) related to effective portion of changes in fair value of treasury rate locks (18)   (12)   (22)      
Total Cash Flow Hedges [Member] | Operating Revenue [Member]
                
Cash Flow Hedge Accumulated Other Comprehensive Income [Abstract]                
Reclassifications from accumulated OCI to net income (86)   (139)   (144) (244)    
Ineffective portion recognized in income           3    
Exelon Generation Co L L C [Member]
                
Cash Flow Hedge Activity Impact [Abstract]                
Net unrealized pre-tax gain (loss) on effective cash flow hedges         1,928      
Net unrealized pre-tax gain (loss) on effective cash flow hedges related to swap contract         693      
Expected reclassification from accumulated other comprehensive income to results of operations         326      
Expected reclassification from accumulated other comprehensive income to results of operations related to fair value of swap contracts         0      
Cash flow hedge activity impact on pre-tax net income based on reclassification adjustment from accumulated other comprehensive income 236   402   459 722    
Change in cash flow hedge ineffectiveness         0 5    
Cash flow hedge ineffectiveness adjustment to accumulated other comprehensive income     5     5    
Derivatives Fair Value [Line Items]                
Mark-to-market derivative assets 845       845   938  
Mark-to-market derivative assets with affiliate (current assets) 0       0   226  
Mark-to-market derivative assets (noncurrent assets) 740       740   924  
Mark-to-market derivative liabilities (current liabilities) (131)       (131)   (334)  
Mark-to-market derivative liabilities (noncurrent liabilities) (109)       (109)   (232)  
Other Derivatives Not Designated As Hedging Instruments [Abstract]                
Change in fair value 383   56   43 149    
Reclassification to realized at settlement 45   144   (18) 116    
Net mark-to-market gains (losses) 428   200   25 265    
Exelon Generation Co L L C [Member] | Operating Revenue [Member]
                
Proprietary Trading Activities [Abstract]                
Change in fair value 5   12   1 14    
Reclassification to realized at settlement (2)   31   4 32    
Net mark-to-market gains (losses) 3   43   5 46    
Exelon Generation Co L L C [Member] | Operating Revenue [Member]
                
Other Derivatives Not Designated As Hedging Instruments [Abstract]                
Change in fair value 460   44   (26) 177    
Reclassification to realized at settlement 44   (54)   (56) (109)    
Net mark-to-market gains (losses) 504   (10)   (82) 68    
Exelon Generation Co L L C [Member] | Operating Revenue [Member] | Consolidation Eliminations [Member]
                
Other Derivatives Not Designated As Hedging Instruments [Abstract]                
Change in fair value (13) [6]   16 [6]   (6) [6] 27 [6]    
Reclassification to realized at settlement 3 [6]   (10) [6]   13 [6] (10) [6]    
Net mark-to-market gains (losses) (10) [6]   6 [6]   7 [6] 17 [6]    
Exelon Generation Co L L C [Member] | Purchased Power And Fuel [Member]
                
Other Derivatives Not Designated As Hedging Instruments [Abstract]                
Change in fair value (77)   12   69 (28)    
Reclassification to realized at settlement 1   198   38 225    
Net mark-to-market gains (losses) (76)   210   107 197    
Exelon Generation Co L L C [Member] | Derivative [Member]
                
Derivatives Fair Value [Line Items]                
Mark-to-market derivative assets 842 [7]       842 [7]   934 [8]  
Mark-to-market derivative assets with affiliate (current assets)             226 [8]  
Mark-to-market derivative assets (noncurrent assets) 702 [7]       702 [7]   878 [8]  
Total mark-to-market derivative assets 1,544 [7]       1,544 [7]   2,038 [8]  
Mark-to-market derivative liabilities (current liabilities) (128) [7]       (128) [7]   (332) [8]  
Mark-to-market derivative liabilities (noncurrent liabilities) (95) [7]       (95) [7]   (201) [8]  
Total mark-to-market derivative liabilities (223) [7]       (223) [7]   (533) [8]  
Total mark-to-market derivative net assets (liabilities) 1,321 [7]       1,321 [7]   1,505 [8]  
Exelon Generation Co L L C [Member] | Designated as Hedging Instrument [Member]
                
Derivatives Fair Value [Line Items]                
Mark-to-market derivative assets 2,585       2,585   2,883 [1]  
Mark-to-market derivative assets with affiliate (current assets)             226 [1]  
Mark-to-market derivative assets (noncurrent assets) 1,471       1,471   1,792 [1]  
Total mark-to-market derivative assets 4,056       4,056   4,901 [1]  
Mark-to-market derivative liabilities (current liabilities) (2,201)       (2,201)   (2,419) [1]  
Mark-to-market derivative liabilities (noncurrent liabilities) (941)       (941)   (1,080) [1]  
Total mark-to-market derivative liabilities (3,142)       (3,142)   (3,499) [1]  
Total mark-to-market derivative net assets (liabilities) 914       914   1,402 [1]  
Footnotes To Derivative Instruments In Statement Of Financial Position Fair Value [Abstract]                
Current assets collateral offset (17)       (17)   113  
Noncurrent assets collateral offset 49       49   201  
Current liabilities collateral offset (254)       (254)   (214)  
Noncurrent liabilities collateral offset (106)       (106)   (131)  
Total cash collateral received net of cash collateral posted             31  
Exelon Generation Co L L C [Member] | Cash Flow Hedging [Member]
                
Footnotes To Derivative Instruments In Statement Of Financial Position Fair Value [Abstract]                
Fair value swap contract current asset 0       0   226  
Fair value swap contract noncurrent asset             0  
Noncurrent liability DOE interest rate swap         23   0  
Exelon Generation Co L L C [Member] | Proprietary Trading [Member]
                
Derivatives Fair Value [Line Items]                
Mark-to-market derivative assets 1,924       1,924   2,469  
Mark-to-market derivative assets (noncurrent assets) 522       522   724  
Total mark-to-market derivative assets 2,446       2,446   3,193  
Mark-to-market derivative liabilities (current liabilities) (1,865)       (1,865)   (2,432)  
Mark-to-market derivative liabilities (noncurrent liabilities) (502)       (502)   (689)  
Total mark-to-market derivative liabilities (2,367)       (2,367)   (3,121)  
Total mark-to-market derivative net assets (liabilities) 79       79   72  
Exelon Generation Co L L C [Member] | Collateral And Netting [Member]
                
Derivatives Fair Value [Line Items]                
Mark-to-market derivative assets (3,667) [9]       (3,667) [9]   (4,418) [9]  
Mark-to-market derivative assets (noncurrent assets) (1,291) [9]       (1,291) [9]   (1,638) [9]  
Total mark-to-market derivative assets (4,958) [9]       (4,958) [9]   (6,056) [9]  
Mark-to-market derivative liabilities (current liabilities) 3,938 [9]       3,938 [9]   4,519 [9]  
Mark-to-market derivative liabilities (noncurrent liabilities) 1,348 [9]       1,348 [9]   1,568 [9]  
Total mark-to-market derivative liabilities 5,286 [9]       5,286 [9]   6,087 [9]  
Total mark-to-market derivative net assets (liabilities) 328 [9]       328 [9]   31 [9]  
Footnotes To Derivative Instruments In Statement Of Financial Position Fair Value [Abstract]                
Total cash collateral received net of cash collateral posted 328       328      
Exelon Generation Co L L C [Member] | Energy Related Hedges [Member]
                
Cash Flow Hedge Accumulated Other Comprehensive Income [Abstract]                
Accumulated OCI derivative gain - Beginning Balance 397 [10],[11] 532 [12],[13] 1,166 [14],[15] 925 [16],[17] 532 [12],[13] 925 [16],[17] 925 [16],[17]  
Effective portion of changes in fair value     0 [18]     432 [19]    
Accumulated OCI derivative gain - Ending Balance 255 [11],[13] 397 [10],[11] 923 [14],[15],[16],[17] 1,166 [14],[15] 255 [11],[13] 923 [14],[15],[16],[17] 532 [12],[13] 925 [16],[17]
Footnotes To Cash Flow Hedge Accumulated Other Comprehensive Income [Abstract]                
Unrealized gain (loss) related to fair value of swap contract     315 419   315 58 420
Unrealized gain (loss) related to fair value of block contract     0     0   0
Net gain (loss) related to effective portion of changes in fair value of swap contract         0   133  
Net gain (loss) of reclassifications from accumulated OCI to net income related to the settlements of swap contract     (104)          
Net gains (losses) related to interest rate swaps and treasury rate locks (11) 16 (23) 12 (11)   (20) (10)
Net gain (loss) related to effective portion of changes in fair value of treasury rate locks           88    
Exelon Generation Co L L C [Member] | Energy Related Hedges [Member] | Operating Revenue [Member]
                
Cash Flow Hedge Accumulated Other Comprehensive Income [Abstract]                
Reclassifications from accumulated OCI to net income (142) [20]   (243) [21]   (277) [22] (437) [23]    
Ineffective portion recognized in income           3    
Footnotes To Cash Flow Hedge Accumulated Other Comprehensive Income [Abstract]                
Net gain (loss) of reclassifications from accumulated OCI to net income related to the settlements of swap contract (58)       (133) (193)    
Commonwealth Edison Co [Member]
                
Derivatives Fair Value [Line Items]                
Mark-to-market derivative liabilities (current liabilities) (16)       (16)   (18)  
Mark-to-market derivative liability with affiliate (current liability) 0       0   (226)  
Mark-to-market derivative liabilities (noncurrent liabilities) (69)       (69)   (49)  
Commonwealth Edison Co [Member] | Derivative [Member]
                
Derivatives Fair Value [Line Items]                
Mark-to-market derivative liabilities (current liabilities)             (18) [1]  
Mark-to-market derivative liability with affiliate (current liability)             (226) [1]  
Mark-to-market derivative liabilities (noncurrent liabilities)             (49) [1]  
Total mark-to-market derivative liabilities             (293) [1]  
Total mark-to-market derivative net assets (liabilities)             (293) [1]  
Commonwealth Edison Co [Member] | Designated as Hedging Instrument [Member]
                
Derivatives Fair Value [Line Items]                
Mark-to-market derivative liabilities (current liabilities) (16) [24]       (16) [24]      
Mark-to-market derivative liabilities (noncurrent liabilities) (69) [24]       (69) [24]      
Total mark-to-market derivative liabilities (85) [24]       (85) [24]      
Total mark-to-market derivative net assets (liabilities) (85) [24]       (85) [24]      
Commonwealth Edison Co [Member] | Cash Flow Hedging [Member]
                
Footnotes To Derivative Instruments In Statement Of Financial Position Fair Value [Abstract]                
Fair value swap contract current liability 0       0   226  
Fair value swap contract noncurrent liability             0  
Commonwealth Edison Co [Member] | Business Intersegment Eliminations [Member]
                
Derivatives Fair Value [Line Items]                
Total mark-to-market derivative assets             (226) [1]  
Mark-to-market derivative liability with affiliate (current liability)             226 [1]  
Total mark-to-market derivative liabilities             $ 226 [1]  
[1] (a)        Includes current and noncurrent assets for Generation and current and noncurrent liabilities for ComEd of $226 million related to the fair value of the five-year financial swap contract between Generation and ComEd, as described above
[2] (d)         Includes $18 million of losses, net of taxes, related to the effective portion of changes in fair value of interest rate swaps and treasury rate locks.
[3] Includes $12 million of losses, net of taxes, at Generation related to the effective portion of changes in fair value of interest rate swaps and treasury rate locks.
[4] Includes $22 million of losses, net of taxes, related to the effective portion of changes in fair value of interest rate swaps and treasury rate locks.
[5] Includes $23 million of losses, net of taxes, related to the effective portion of changes in fair value of interest rate swaps and treasury rate locks.
[6] Prior to the merger, the five-year financial swap contract between Generation and ComEd was de-designated. As a result, all prospective changes in fair value are recorded to operating revenues and eliminated in consolidation.
[7]  These are not reflected in the table above. (b)        Current and noncurrent assets are shown net of collateral of $17 million and $49 million, respectively, and current and noncurrent liabilities are shown net of collateral of $254 million and $106 million, respectively. The total cash collateral posted, net of cash collateral received and offset against mark-to-market assets and liabilities was $328 million at June 30, 2013.
[8] (c)        Current and noncurrent assets are shown net of collateral of $113 million and $201 million, respectively, and current and noncurrent liabilities are shown net of collateral of $ (214) million and $ (131) million, respectively. The total cash collateral received, net of cash collateral posted and offset against mark-to-market assets and liabilities was $31 million at December 31, 2012.
[9] 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 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.
[10] (a)        Includes $58 million of gains, net of taxes, related to the fair value of the five-year financial swap contract with ComEd, as of March 31, 2013.
[11] Excludes $11 million of losses and $16 million of losses net of taxes, related to interest rate swaps and treasury rate locks as of June 30, 2013 and March 31, 2013, respectively.
[12]         Includes $133 million of gains, net of taxes, related to the fair value of the five-year financial swap contract with ComEd, as of December 31, 2012.
[13] Excludes $11 million of losses and $20 million of losses, net of taxes, related to interest rate swaps and treasury locks as of June 30, 2013 and December 31, 2012, respectively.
[14] Includes $315 million and $419 million of gains, net of taxes, related to the fair value of the five-year financial swap contract with ComEd as of June 30, 2012 and March 31, 2012, respectively.
[15] Excludes $23 million of losses and $12 million of gains, net of taxes, related to interest rate swaps and treasury rate locks for the three months ended June 30, 2012 and month ended March 31, 2012, respectively.
[16] Includes $315 million and $420 million of gains, net of taxes, related to the fair value of the five-year financial swap contract with ComEd, as of June 30, 2012 and December 31, 2011.
[17] Excludes $23 million of losses and $10 million of losses, net of taxes, related to interest rate swaps and treasury rate locks for the six months ended June 30, 2012 and year ended December 31, 2011, respectively.
[18] Includes $18 million of losses, net of taxes, related to the effective portion of changes in fair value of interest rate swaps and treasury rate locks.
[19] Includes $88 million of gains, net of taxes, related to the effective portion of changes in fair value of the five-year financial swap contract with ComEd through the date of de-designation prior to the merger.
[20] Includes $58 million of losses, net of taxes, reclassified from accumulated OCI to recognize gains in net income related to the settlements of the five-year financial swap contract with ComEd.
[21] Includes a $104 million of losses, net of taxes, reclassified from accumulated OCI to recognize gains in net income related to the settlements of the five-year financial swap contract with ComEd.
[22] Includes $133 million of losses, net of taxes, reclassified from accumulated OCI to recognize gains in net income related to the settlements of the five-year financial swap contract with ComEd
[23] Includes $193 million of losses, net of taxes, reclassified from accumulated OCI to recognize gains in net income related to the settlements of the five-year financial swap contract with ComEd.
[24] Includes current and noncurrent liabilities relating to floating-to-fixed energy swap contracts with unaffiliated suppliers.