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Derivative Financial Instruments (Details) (USD $)
 3 Months Ended 12 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Mar. 31, 2012
Operating Revenue [Member]
Mar. 31, 2011
Operating Revenue [Member]
Mar. 31, 2012
Pro Forma Operating Revenue [Member]
Mar. 31, 2012
Operating Revenue [Member]
Mar. 31, 2012
Proprietary Trading [Member]
Mar. 31, 2012
Collateral And Netting [Member]
Mar. 31, 2012
More Than Two And Within Three Years From Balance Sheet Date [Member]
Dec. 31, 2011
More Than Two And Within Three Years From Balance Sheet Date [Member]
Mar. 31, 2012
Interest Expense [Member]
Mar. 31, 2011
Interest Expense [Member]
Mar. 31, 2012
Total Cash Flow Hedges [Member]
Mar. 31, 2011
Total Cash Flow Hedges [Member]
Mar. 31, 2012
Total Cash Flow Hedges [Member]
Operating Revenue [Member]
Mar. 31, 2011
Total Cash Flow Hedges [Member]
Operating Revenue [Member]
Mar. 31, 2012
Total Cash Flow Hedges [Member]
Purchased Power [Member]
Mar. 31, 2011
Total Cash Flow Hedges [Member]
Purchased Power [Member]
Mar. 31, 2012
Exelon Generation Co L L C [Member]
GWH
Mar. 31, 2011
Exelon Generation Co L L C [Member]
GWH
Dec. 31, 2011
Exelon Generation Co L L C [Member]
Mar. 31, 2012
Exelon Generation Co L L C [Member]
Operating Revenue [Member]
Mar. 31, 2011
Exelon Generation Co L L C [Member]
Operating Revenue [Member]
Mar. 31, 2012
Exelon Generation Co L L C [Member]
Pro Forma Operating Revenue [Member]
Mar. 31, 2012
Exelon Generation Co L L C [Member]
Pro Forma Purchased Power And Fuel [Member]
Mar. 31, 2012
Exelon Generation Co L L C [Member]
Operating Revenue [Member]
Mar. 31, 2011
Exelon Generation Co L L C [Member]
Operating Revenue [Member]
Mar. 31, 2011
Exelon Generation Co L L C [Member]
Purchased Power And Fuel [Member]
Mar. 31, 2012
Exelon Generation Co L L C [Member]
Purchased Power [Member]
Mar. 31, 2012
Exelon Generation Co L L C [Member]
Derivative [Member]
Dec. 31, 2011
Exelon Generation Co L L C [Member]
Derivative [Member]
Dec. 31, 2011
Exelon Generation Co L L C [Member]
Cash Flow Hedging [Member]
Mar. 31, 2012
Exelon Generation Co L L C [Member]
Proprietary Trading [Member]
Dec. 31, 2011
Exelon Generation Co L L C [Member]
Proprietary Trading [Member]
Mar. 31, 2012
Exelon Generation Co L L C [Member]
Collateral And Netting [Member]
Dec. 31, 2011
Exelon Generation Co L L C [Member]
Collateral And Netting [Member]
Mar. 31, 2012
Exelon Generation Co L L C [Member]
One Year From Balance Sheet Date [Member]
Mar. 31, 2012
Exelon Generation Co L L C [Member]
More Than One And Within Two Years From Balance Sheet Date [Member]
Sep. 30, 2011
Exelon Generation Co L L C [Member]
More Than One And Within Two Years From Balance Sheet Date [Member]
MW
Mar. 31, 2012
Exelon Generation Co L L C [Member]
More Than Two And Within Three Years From Balance Sheet Date [Member]
Mar. 31, 2012
Exelon Generation Co L L C [Member]
Total Exposure Before Credit Collateral [Member]
Mar. 31, 2012
Exelon Generation Co L L C [Member]
Credit Collateral [Member]
Mar. 31, 2012
Exelon Generation Co L L C [Member]
Net Exposure [Member]
Mar. 31, 2012
Exelon Generation Co L L C [Member]
Number Of Counterparties Greater Than Ten Percent Of Net Exposure [Member]
Mar. 31, 2012
Exelon Generation Co L L C [Member]
Net Exposure Of Counterparties Greater Than Ten Percent Of Net Exposure [Member]
Mar. 31, 2012
Exelon Generation Co L L C [Member]
Energy Related Hedges [Member]
Mar. 31, 2011
Exelon Generation Co L L C [Member]
Energy Related Hedges [Member]
Dec. 31, 2011
Exelon Generation Co L L C [Member]
Energy Related Hedges [Member]
Dec. 31, 2010
Exelon Generation Co L L C [Member]
Energy Related Hedges [Member]
Mar. 31, 2012
Exelon Generation Co L L C [Member]
Energy Related Hedges [Member]
Operating Revenue [Member]
Mar. 31, 2011
Exelon Generation Co L L C [Member]
Energy Related Hedges [Member]
Operating Revenue [Member]
Mar. 31, 2012
Exelon Generation Co L L C [Member]
Energy Related Hedges [Member]
Purchased Power [Member]
Mar. 31, 2011
Exelon Generation Co L L C [Member]
Energy Related Hedges [Member]
Purchased Power [Member]
Mar. 31, 2011
Exelon Generation Co L L C [Member]
Total Cash Flow Hedges [Member]
Mar. 31, 2012
Exelon Generation Co L L C [Member]
Total Cash Flow Hedges [Member]
Mar. 31, 2012
Commonwealth Edison Co [Member]
Dec. 31, 2011
Commonwealth Edison Co [Member]
Mar. 31, 2012
Commonwealth Edison Co [Member]
Derivative [Member]
Dec. 31, 2011
Commonwealth Edison Co [Member]
Derivative [Member]
Mar. 31, 2012
PECO Energy Co [Member]
Dec. 31, 2011
PECO Energy Co [Member]
Mar. 31, 2012
Baltimore Gas and Electric Company [Member]
Mar. 31, 2012
Other Segment [Member]
Dec. 31, 2011
Other Segment [Member]
Derivative [Member]
Mar. 31, 2012
Other Segment [Member]
Business Intersegment Eliminations [Member]
Dec. 31, 2011
Other Segment [Member]
Business Intersegment Eliminations [Member]
Cash Flow Hedge Accumulated Other Comprehensive Income [Abstract]                                                                                                                                      
Accumulated OCI derivative gain - Beginning Balance                           $ 488,000,000 $ 400,000,000                                                               $ 925,000,000 [1],[2] $ 1,011,000,000 [3],[4]               $ 703,000,000                      
Effective portion of changes in fair value                           317,000,000 [5] 18,000,000                                                               432,000,000 [6] 63,000,000 [7]                                      
Reclassifications from accumulated OCI to net income                               (105,000,000) (63,000,000)                                                                   (194,000,000) [8] (132,000,000) [9]                              
Ineffective portion recognized in income     1,000,000                             3,000,000 (1,000,000)                                                                   3,000,000 (1,000,000)                          
Accumulated OCI derivative gain - Ending Balance                             354,000,000                                                               1,166,000,000 [1],[2] 941,000,000 [10],[3]               703,000,000                      
Footnotes To Cash Flow Hedge Accumulated Other Comprehensive Income [Abstract]                                                                                                                                      
Unrealized gain (loss) related to fair value of swap contract                                                                                             419,000,000 562,000,000 420,000,000 589,000,000                                  
Unrealized gain (loss) related to fair value of block contract                                                                                               2,000,000   3,000,000                                  
Net gain (loss) related to effective portion of changes in fair value of swap contract                                                                                             88,000,000 (41,000,000)                                      
Net gain (loss) of reclassifications from accumulated OCI to net income related to the settlements of swap contract                                                                                                     (89,000,000) 68,000,000                              
Net gain (loss) of reclassifications from accumulated OCI to net income related to settlements of block contracts                                                                                                       1,000,000                              
Net gains related to interest rate swaps and treasury rate locks                                                                                             12,000,000 (10,000,000)                                      
Net gain (loss) related to effective portion of changes in fair value of treasury rate locks 12,000,000                                                                                                           2,000,000                        
Cash flow hedge ineffectiveness due to dedesignation                                                                                             2,000,000                                        
Credit Risk Exposure [Abstract]                                                                                                                                      
Investment grade                                                                                   2,835,000,000 895,000,000 1,940,000,000 0 0                                          
Non-investment grade                                                                                   62,000,000 49,000,000 13,000,000 0 0                                          
No external ratings - internally rated - investment grade                                                                                   617,000,000 19,000,000 598,000,000 1,000,000 293,000,000                                          
No external ratings - internally rated - non-investment grade                                                                                   41,000,000 4,000,000 37,000,000 0 0                                          
Total                                                                                   3,555,000,000 967,000,000 2,588,000,000 1,000,000 293,000,000                                          
Financial institutions                                       488,000,000                                                                                              
Investor-owned utilities, marketers and power producers                                       1,206,000,000                                                                                              
Energy cooperative and municipalities                                       798,000,000                                                                                              
Other                                       96,000,000                                                                                              
Total                                       2,588,000,000                                                                                              
Derivative Instruments Gain Loss Recognized In Income Net [Abstract]                                                                                                                                      
Gain on swaps/borrowings                       (3,000,000) [11] (2,000,000) [11]                                                                                                            
Loss on swaps/borrowings                       1,000,000 [11] 2,000,000 [11]                                                                                                            
Percent Of Expected Generation Being Hedged [Abstract]                                                                                                                                      
Minimum range of expected generation hedged                                                                           95.00% 68.00%   40.00%                                                    
Maximum range of expected generation hedged                                                                           98.00% 71.00%   43.00%                                                    
Swap Contract Volumes [Abstract]                                                                                                                                      
Swap contract volumes                                                                               3,000                                                      
Percent Of Gas Purchases Being Hedged [Abstract]                                                                                                                                      
Minimum percentage of natural gas purchases hedged                                                                                                                         22.00%            
Maximum percentage of natural gas purchases hedged                                                                                                                         29.00%            
Proprietary Trading Volumes [Abstract]                                                                                                                                      
Proprietary trading activities volume                                       1,888 1,333                                                                                            
Cost Of Capital Strategies [Abstract]                                                                                                                                      
Pre-tax net income impact associated with a hypothetical 10% increase in interest rates - exclusive upper bound 1,000,000                                     1,000,000                                                                                 1,000,000   1,000,000        
Interest Rate Risk - Fair Value Hedges [Abstract]                                                                                                                                      
Notional amounts of fair value hedges outstanding related to interest rate swaps                   650,000,000 100,000,000                                                                                                                
Fair value assets                   56,000,000 14,000,000                                                                                                                
Interest rate swaps previously held by acquiree 550,000,000                                                                                                                                    
Fair value of interest rate swaps from merger acquiree 44,000,000                                                                                                                                    
Notional amount of interest rate swaps acquired from merger 150,000,000                                                                                                                                    
Fair value of interest rate swaps acquired from merger     5,000,000                                                                                                                                
Interest Rate Risk - Cash Flow Hedges [Abstract]                                                                                                                                      
DOE loan guarantee                                       646,000,000                                                                                              
DOE interest rate swap 485,000,000                                     485,000,000                                                                                              
Percentage of interest rate swap in relation to DOE guarantee                                       75                                                                                              
Notional amount of interest rate swap DOE advance                                       52,000,000                                                                                              
Percent of DOE loan advance offset                                       75.00%                                                                                              
Notional amount of remaining cash flow hedges                                       433,000,000                                                                                              
Notional amounts on forward starting interest rate swaps                                       31,500,000                                                                                              
Noncurrent Derivative Liability Forward Starting Interest Rate Swaps                                       3,000,000                                                                                              
Cash Flow Hedge Activity Impact [Abstract]                                                                                                                                      
Net unrealized pre-tax gain (loss) on effective cash flow hedges                                       1,928,000,000                                                                                              
Net unrealized pre-tax gain (loss) on effective cash flow hedges related to swap contract                                       693,000,000                                                                                              
Expected reclassification from accumulated other comprehensive income to results of operations 173,000,000 105,000,000                                   320,000,000 218,000,000                                 1,270,000,000                                                          
Expected reclassification from accumulated other comprehensive income to results of operations related to fair value of swap contracts                                       590,000,000                                                                                              
Change in cash flow hedge ineffectiveness (5,000,000) 3,000,000                                   (5,000,000) 3,000,000                                                                                            
Cash flow hedge ineffectiveness adjustment to accumulated other comprehensive income 0 3,000,000                                   0 3,000,000                                                                                            
Due From Related Parties [Abstract]                                                                                                                                      
Net receivable from electric utility                                       76,000,000                                                                                              
Net receivable from affiliated electric and gas utility                                       46,000,000                                                                                     20,000,000        
Natural Gas Supply And Management Agreement Credit Exposure [Abstract]                                                                                                                                      
Natural gas asset manager parental guarantee                                                                                                                         14,000,000            
Credit exposure under natural gas supply and management agreements                                                                                                                         3,000,000            
Credit exposure under off system sales                                                                                                                             8,000,000        
Collateral And Contingent Related Features [Abstract]                                                                                                                                      
Aggregate fair value of derivatives with credit-risk-related contingent features 5,623,000,000 [12]   1,014,000,000 [12]                                                                                                                                
Contractual right of offset related to derivative assets 4,397,000,000 [13]   928,000,000 [13]                                                                                                                                
Net liability position after contractual right of offset 1,226,000,000 [14]   86,000,000 [14]                                                                                                                                
Incremental collateral for loss of investment grade credit rating 2,772,000,000 [15]   1,612,000,000 [15]                                                                                                                   48,000,000            
Cash collateral held (posted)                                       215,000,000   542,000,000                                                                                          
Letters of credit held (posted)                                       (1,164,000,000)   89,000,000                                                                                          
Line Of Credit Facility Amount Outstanding                                                                                                                             599,000,000        
Swap Contract Collateral Posting Limit [Abstract]                                                                                                                                      
Fair value of interest-rate swap in asset position                                       51,000,000                                                                                              
Master Netting Arrangements [Abstract]                                                                                                                                      
Cash collateral received not offset against net derivative positions                                       22,000,000   2,000,000                                                                                          
Derivatives Fair Value [Line Items]                                                                                                                                      
Mark-to-market derivative assets (current assets) 1,470,000,000 [16]   432,000,000         7,904,000,000 (13,141,000,000) [17]                     1,491,000,000   432,000,000 [18]                 6,707,000,000 1,195,000,000 438,000,000   217,000,000   (1,418,000,000) [17]                                           0 0       0 0   0
Mark-to-market derivative assets with affiliate (current assets) 0   0                                 590,000,000 [16]   503,000,000 [18]                 590,000,000 [19] 0 503,000,000 [20] 0 0 0 0                                           0 0         0 (590,000,000) [19] (503,000,000) [20]
Mark-to-market derivative assets (noncurrent assets) 1,291,000,000 [16]   650,000,000         2,083,000,000 (3,976,000,000) [17]                         635,000,000 [18]                 3,184,000,000 582,000,000 419,000,000   71,000,000   (437,000,000) [17]                                           0 0         15,000,000 0 0
Mark-to-market derivative assets with affiliate (noncurrent assets) 0   0                                 92,000,000 [16]   191,000,000 [18]                 92,000,000 [19] 0 191,000,000 [20] 0 0 0 0                                           0 0         0 (92,000,000) [19] (191,000,000) [20]
Total mark-to-market derivative assets 2,761,000,000   1,082,000,000                                 3,443,000,000 [16]   1,761,000,000 [18]                 10,573,000,000 [19] 1,777,000,000 1,551,000,000 [20] 9,987,000,000 288,000,000 (17,117,000,000) [17] (1,855,000,000) [17]                                           0 0         15,000,000 (682,000,000) (694,000,000) [20]
Mark-to-market derivative liabilities (current liabilities) (1,086,000,000)   (112,000,000)         (7,939,000,000) 13,072,000,000 [17]                     (1,070,000,000) [16]   (103,000,000) [18]                 (6,203,000,000) (965,000,000) (9,000,000)   (194,000,000)   1,065,000,000 [17]                                       (16,000,000) (9,000,000) (16,000,000) [21] (9,000,000) [21] 0 0     0 0 0
Mark-to-market derivative liability with affiliate (current liability) 0   0                                 0   0                 0 0 0 0 0 0 0                                       (590,000,000) (503,000,000) (590,000,000) [19] (503,000,000) [20] 0 0     0 590,000,000 [19] 503,000,000 [20]
Mark-to-market energy derivative liabilities (noncurrent liabilities) (637,000,000)   (107,000,000)         (2,028,000,000) 3,807,000,000 [17]                     (512,000,000) [16]   (10,000,000) [18]                 (2,291,000,000) (186,000,000) (4,000,000)   (70,000,000)   250,000,000 [17]                                           (125,000,000) [21] (97,000,000) [21]         0 0 0
Mark-to-market derivative liabilities with affiliate (noncurrent liabilities) 0   0                                 0   0                 0 0 0 0 0 0 0                                       (92,000,000) (191,000,000) (92,000,000) [19] (191,000,000) [20]         0 92,000,000 [19] 191,000,000 [20]
Total mark-to-market derivative liabilities (1,723,000,000)   (219,000,000)                                 (1,582,000,000) [16]   (113,000,000) [18]                 (8,494,000,000) [19] (1,151,000,000) (13,000,000) (9,967,000,000) (264,000,000) 16,879,000,000 [17] 1,315,000,000 [17]                                           (823,000,000) [19],[21] (800,000,000) [20],[21]         0 682,000,000 [19] 694,000,000
Total mark-to-market derivative net assets (liabilities) 1,038,000,000   863,000,000                                 1,861,174,291 [16]   1,648,000,000 [18]                 2,079,174,291 [19] 626,000,000 1,538,000,000 20,000,000 24,000,000 (238,000,000) [17] (540,000,000) [17]                                           (823,000,000) [19],[21] (800,000,000) [20],[21]         15,000,000 0 0
Footnotes To Derivative Instruments In Statement Of Financial Position Fair Value [Abstract]                                                                                                                                      
Fair value swap contract current asset                                       590,000,000   503,000,000                 590,000,000 503,000,000                                                                      
Fair value swap contract noncurrent asset                                       92,000,000   191,000,000                 92,000,000 191,000,000                                                                      
Fair value swap contract current liability                                                                                                                 590,000,000 503,000,000 590,000,000 503,000,000              
Fair value swap contract noncurrent liability                                                                                                                 92,000,000 191,000,000 92,000,000 191,000,000              
Current assets collateral                                       281,000,000                                 338,000,000                                                            
Noncurrent assets collateral                                       400,000,000                                 187,000,000                                                            
Current liabilities collateral                                       (212,000,000)                                 15,000,000                                                            
Noncurrent liabilities collateral                                       (231,000,000)                                 0                                                            
Total cash collateral received net of cash collateral posted                                       238,000,000                                 540,000,000                                                            
Noncurrent liability interest rate swap AVSR                                                                 19,000,000                                                                    
Other Derivatives Not Designated As Hedging Instruments [Abstract]                                                                                                                                      
Change in fair value 109,000,000           11,000,000 [22]                         98,000,000 (3,000,000)       1,000,000 (4,000,000) 138,000,000 0 (3,000,000) (40,000,000)                                                                          
Reclassification to realized at settlement (33,000,000)           0 [22]                         (33,000,000) (145,000,000)       (132,000,000) (13,000,000) (60,000,000) 0 (145,000,000) 27,000,000                                                                          
Net mark-to-market gains (losses) 76,000,000         (131,000,000) [23] 11,000,000 [22]                         65,000,000 (148,000,000) [23]         (17,000,000) [23] 78,000,000 0 [23] (148,000,000) [23] (13,000,000)                                                                          
Proprietary Trading Activities [Abstract]                                                                                                                                      
Change in fair value       2,000,000 4,000,000                                   2,000,000 4,000,000                                                                                      
Reclassification to realized at settlement       1,000,000 (6,000,000)                                   1,000,000 (6,000,000)                                                                                      
Net mark-to-market gains (losses)       $ 3,000,000 $ (2,000,000)                                   $ 3,000,000 $ (2,000,000)                                                                                      
[1] Includes $419 million and $420 million of gains, net of taxes, related to the fair value of the five-year financial swap contract with ComEd.
[2] Excludes $12 million of gains and $10 million of losses, net of taxes, related to interest rate swaps and treasury rate locks for the three months ended March 31, 2012 and year ended December 31, 2011, respectively.
[3] Includes $562 million and $589 million of gains, net of taxes, related to the fair value of the five-year financial swap contract with ComEd, $2 million and $3 million of gains, net of taxes, related to the fair value of the block contracts with PECO as of March 31, 2011 and December 31, 2010, respectively.
[4] Includes $##D<gfvswapnotYTD> million and $589 million of gains, net of taxes, related to the fair value of the five-year financial swap contract with ComEd, and $##D<gfvPeconotYTD> million and $3 million of gains, net of taxes, related to the fair value of the block contracts with PECO as of ##D<cyperiod> and ##D<pyend>.
[5] Includes $12 million of gains, net of taxes, related to the effective portion of changes in fair value of interest rate swaps and treasury rate locks.
[6] 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 for the period ended March 9, 2012.
[7] Includes a $41 million gain, net of taxes, related to the effective portion of changes in fair value of the five-year financial swap contract with ComEd for the three months ended March 31, 2011. The PECO block contracts were designated as normal sales as of May 31, 2010. As such, there were no effective changes in fair value of the block contracts with PECO for the three months ended March 31, 2011 as the mark-to-market balances previously recorded will be amortized over the term of the contract.
[8] Includes $89 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.
[9] Includes a $68 million loss, 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, and a $1 million loss, net of taxes, reclassified from accumulated OCI to recognize gains in net income related to the fair value of the block contracts with PECO for the three months ended March 31, 2011.
[10] Excludes $2 million of gains, net of taxes, related to interest rate swaps and treasury rate locks.
[11] For the period ended March 31, 2012, the (Loss) on the swaps in the table above includes pre-tax losses of $1 million related to changes in fair value hedges, which is excluded from hedge ineffectiveness.
[12] Amount represents the gross fair value of out-of-the-money derivative contracts containing credit-risk-related contingent features that are not fully collateralized by posted cash collateral on an individual, contract-by-contract basis ignoring the effects of master netting agreements.
[13] Amount represents the offsetting fair value of in-the-money derivative contracts under legally-enforceable master netting agreements with the same counterparty, which reduces the amount of any liability for which Exelon could potentially be required to post collateral.
[14] Amount represents the net fair value of out-of-the-money derivative contracts containing credit-risk related contingent features after considering the mitigating effects of offsetting positions under master netting arrangements and reflects the actual net liability upon which any potential contingent collateral obligations would be based.
[15] Amounts represent the additional collateral that Exelon Generation Company, LLC and Constellation Energy Commodities Group, Inc. could be required to post with counterparties, including both cash collateral and letters of credit, in the event of a credit downgrade to below investment grade after giving consideration to offsetting derivative and non-derivative positions under master netting agreements.
[16] Current and noncurrent assets are shown net of collateral of $281 million and $400 million, respectively, and current and noncurrent liabilities are shown inclusive of collateral of $(212) million and $(231) million, respectively. The total cash collateral received, net of cash collateral posted and offset against mark-to-market assets and liabilities was $238 million at March 31, 2012.
[17] Represents the netting of fair value balances with the same counterparty and the application of collateral.
[18] Current and noncurrent assets are shown net of collateral of $338 million and $187 million, respectively, and current and noncurrent liabilities are shown inclusive of collateral of $15 million and $0 million, respectively. The total cash collateral received net of cash collateral posted and offset against mark-to-market assets and liabilities was $540 million at December 31, 2011.
[19] Includes current and noncurrent assets for Generation and current and noncurrent liabilities for ComEd of $590 million and $92 million, respectively, related to the fair value of the five-year financial swap contract between Generation and ComEd, as described above.
[20] Includes current and noncurrent assets for Generation and current and noncurrent liabilities for ComEd of $503 million and $191 million, respectively, related to the fair value of the five-year financial swap contract between Generation and ComEd, as described above. For Generation excludes $19 million noncurrent liability relating to an interest rate swap in connection with a loan agreement to fund Antelope Valley as discussed above.
[21] Includes current and noncurrent liabilities relating to floating-to-fixed energy swap contracts with unaffiliated suppliers.
[22] 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.
[23] Exelon and Generation have historically presented mark-to-market gains and losses within purchased power expense for all non-trading, energy-related derivatives that were not accounted for as cash flow hedges. In 2011, Exelon and Generation classified the mark-to-market gains and losses for contracts, where the underlying hedged transaction was an expected sale to hedge power, to operating revenues