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Consolidated Balance Sheets (Unaudited) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Current assets    
Cash and cash equivalents $ 1,349,000,000 $ 1,016,000,000
Restricted cash and investments 83,000,000 40,000,000
Restricted cash and investments of variable interest entity 34,000,000  
Accounts receivable, net    
Customer 2,886,000,000 1,613,000,000
Other 1,252,000,000 1,000,000,000
Accounts receivable of variable interest entities 183,000,000  
Mark-to-market derivative assets 1,170,000,000 432,000,000
Mark-to-market derivative assets with affiliates 0 0
Unamortized energy contracts assets 1,433,000,000 13,000,000
Inventories, net    
Fossil fuel 227,000,000 208,000,000
Materials and supplies 772,000,000 656,000,000
Deferred income taxes 63,000,000 0
Regulatory assets 867,000,000 390,000,000
Other 1,435,000,000 345,000,000
Total current assets 11,754,000,000 5,713,000,000
Property, plant and equipment, net 42,613,000,000 32,570,000,000
Deferred debits and other assets    
Regulatory assets 6,103,000,000 4,518,000,000
Nuclear decommissioning trust funds 6,841,000,000 6,507,000,000
Investments 836,000,000 751,000,000
Investments in affiliates 420,000,000 15,000,000
Investment in CENG 1,878,000,000 0
Goodwill 2,625,000,000 2,625,000,000
Mark-to-market derivative assets 1,241,000,000 650,000,000
Mark-to-market derivative assets with affiliates   0
Pledged assets for Zion Station decommissioning 650,000,000 734,000,000
Unamortized energy contracts assets 1,317,000,000 388,000,000
Other 1,156,000,000 524,000,000
Total deferred debits and other assets 23,067,000,000 16,712,000,000
Total assets 77,434,000,000 54,995,000,000
Current liabilities    
Short-term borrowings 376,000,000 163,000,000
Short-term notes payable - accounts receivable agreement 225,000,000 225,000,000
Long-term debt due within one year 526,000,000 828,000,000
Long-term debt of variable interest entities due within one year 65,000,000 0
Accounts payable 2,183,000,000 1,444,000,000
Accounts payable of variable interest entities 119,000,000 0
Accrued expenses 1,452,000,000 1,255,000,000
Deferred income taxes 482,000,000 1,000,000
Regulatory liabilities 259,000,000 197,000,000
Dividends payable 4,000,000 349,000,000
Mark-to-market derivative liabilities 829,000,000 112,000,000
Mark-to-market derivative liabilities with affiliate 0 0
Unamortized energy contract liabilities 616,000,000 0
Other 947,000,000 560,000,000
Total current liabilities 8,083,000,000 5,134,000,000
Long-term debt 17,045,000,000 11,799,000,000
Long-term debt of variable interest entities 649,000,000 390,000,000
Long-term debt of variable interest entity 479,000,000 0
Deferred credits and other liabilities    
Deferred income taxes and unamortized investment tax credits 10,823,000,000 8,253,000,000
Asset retirement obligations 4,126,000,000 3,884,000,000
Pension obligations 2,610,000,000 2,194,000,000
Non-pension postretirement benefit obligations 2,703,000,000 2,263,000,000
Spent nuclear fuel obligation 1,019,000,000 1,019,000,000
Regulatory liabilities 3,963,000,000 3,627,000,000
Mark-to-market derivative liabilities 578,000,000 126,000,000
Mark-to-market derivative liabilities with affiliate   0
Unamortized energy contract liabilities 747,000,000 0
Payable for Zion Station decommissioning 464,000,000 563,000,000
Other 1,736,000,000 1,268,000,000
Total deferred credits and other liabilities 28,769,000,000 23,197,000,000
Total liabilities 55,025,000,000 40,520,000,000
Commitments and contingencies 0 0
Preferred securities 87,000,000 87,000,000
Shareholders' equity    
Common stock 16,559,000,000 9,107,000,000
Treasury stock, at cost (35 and 35 shares held at December 31, 2010 and December 31, 2009, respectively) (2,327,000,000) (2,327,000,000)
Retained earnings 10,114,000,000 10,055,000,000
Accumulated other comprehensive income (loss), net (2,313,000,000) (2,450,000,000)
Total shareholders' equity 22,033,000,000 14,385,000,000
BGE preference stock not subject to mandatory redemption 193,000,000 0
Noncontrolling interest 96,000,000 3,000,000
Total equity 22,322,000,000 14,388,000,000
Total liabilities and shareholders' equity 77,434,000,000 54,995,000,000
Member's equity    
Accumulated other comprehensive income (loss), net (2,313,000,000) (2,450,000,000)
Noncontrolling interest 96,000,000 3,000,000
Removal Costs [Member]
    
Current liabilities    
Regulatory liabilities 87,000,000 61,000,000
Deferred credits and other liabilities    
Regulatory liabilities 1,397,000,000 1,185,000,000
Customer Rate Credit [Member]
    
Current liabilities    
Regulatory liabilities 0  
Deferred credits and other liabilities    
Regulatory liabilities 0  
Exelon Generation Co L L C [Member]
    
Current assets    
Cash and cash equivalents 930,000,000 496,000,000
Restricted cash and cash equivalents 2,000,000 5,000,000
Restricted cash and investments of variable interest entity 12,000,000  
Accounts receivable, net    
Customer 1,579,000,000 578,000,000
Other 254,000,000 257,000,000
Accounts receivable of variable interest entities 183,000,000  
Mark-to-market derivative assets 1,170,000,000 432,000,000
Mark-to-market derivative assets with affiliates 506,000,000 [1] 503,000,000 [2]
Receivables from affiliates 144,000,000 109,000,000
Unamortized energy contracts assets 1,433,000,000 13,000,000
Inventories, net    
Fossil fuel 134,000,000 120,000,000
Materials and supplies 628,000,000 556,000,000
Other 1,110,000,000 148,000,000
Total current assets 8,085,000,000 3,217,000,000
Property, plant and equipment, net 17,702,000,000 13,475,000,000
Deferred debits and other assets    
Nuclear decommissioning trust funds 6,841,000,000 6,507,000,000
Investments 82,000,000 41,000,000
Investments in affiliates 397,000,000 1,000,000
Investment in CENG 1,878,000,000 0
Mark-to-market derivative assets 1,227,000,000 635,000,000
Mark-to-market derivative assets with affiliates 0 191,000,000 [2]
Prepaid pension asset 2,057,000,000 2,068,000,000
Pledged assets for Zion Station decommissioning 650,000,000 734,000,000
Unamortized energy contracts assets 1,317,000,000 388,000,000
Other 851,000,000 176,000,000
Total deferred debits and other assets 15,300,000,000 10,741,000,000
Total assets 41,087,000,000 27,433,000,000
Current liabilities    
Short-term borrowings 10,000,000 2,000,000
Long-term debt due within one year 23,000,000 3,000,000
Long-term debt of variable interest entities due within one year 3,000,000  
Accounts payable 1,310,000,000 753,000,000
Accounts payable of variable interest entities 119,000,000 0
Accrued expenses 885,000,000 779,000,000
Payables to affiliates 115,000,000 58,000,000
Deferred income taxes 567,000,000 244,000,000
Mark-to-market derivative liabilities 810,000,000 103,000,000
Mark-to-market derivative liabilities with affiliate 0 0
Unamortized energy contract liabilities 506,000,000 0
Other 378,000,000 202,000,000
Total current liabilities 4,726,000,000 2,144,000,000
Long-term debt 7,163,000,000 3,674,000,000
Long-term debt of variable interest entity 180,000,000 0
Deferred credits and other liabilities    
Deferred income taxes and unamortized investment tax credits 4,892,000,000 3,966,000,000
Asset retirement obligations 3,997,000,000 3,767,000,000
Non-pension postretirement benefit obligations 815,000,000 703,000,000
Spent nuclear fuel obligation 1,019,000,000 1,019,000,000
Payables to affiliates 2,352,000,000 2,222,000,000
Mark-to-market derivative liabilities 485,000,000 29,000,000
Mark-to-market derivative liabilities with affiliate   0
Unamortized energy contract liabilities 696,000,000 0
Payable for Zion Station decommissioning 464,000,000 563,000,000
Other 793,000,000 638,000,000
Total deferred credits and other liabilities 15,513,000,000 12,907,000,000
Total liabilities 27,582,000,000 18,725,000,000
Commitments and contingencies 0 0
Shareholders' equity    
Accumulated other comprehensive income (loss), net 904,000,000 915,000,000
Noncontrolling interest 98,000,000 5,000,000
Member's equity    
Membership interest 8,828,000,000 3,556,000,000
Undistributed earnings 3,675,000,000 4,232,000,000
Accumulated other comprehensive income (loss), net 904,000,000 915,000,000
Total member's equity 13,407,000,000 8,703,000,000
Noncontrolling interest 98,000,000 5,000,000
Total equity 13,505,000,000 8,708,000,000
Total liabilities and equity 41,087,000,000 27,433,000,000
Commonwealth Edison Co [Member]
    
Current assets    
Cash and cash equivalents 29,000,000 234,000,000
Restricted cash and cash equivalents 3,000,000 3,000,000
Accounts receivable, net    
Customer 675,000,000 655,000,000
Other 245,000,000 385,000,000
Inventories, net    
Inventories, net 88,000,000 81,000,000
Deferred income taxes 74,000,000 61,000,000
Counterparty collateral deposited 84,000,000 90,000,000
Regulatory assets 726,000,000 657,000,000
Other 23,000,000 22,000,000
Total current assets 1,947,000,000 2,188,000,000
Property, plant and equipment, net 13,428,000,000 13,121,000,000
Deferred debits and other assets    
Regulatory assets 583,000,000 699,000,000
Investments 15,000,000 21,000,000
Investments in affiliates 6,000,000 6,000,000
Goodwill 2,625,000,000 2,625,000,000
Receivable from affiliate 1,963,000,000 1,860,000,000
Mark-to-market derivative assets 0 0
Prepaid pension asset 1,736,000,000 1,803,000,000
Other 282,000,000 315,000,000
Total deferred debits and other assets 7,210,000,000 7,329,000,000
Total assets 22,585,000,000 22,638,000,000
Current liabilities    
Short-term borrowings 178,000,000 0
Long-term debt due within one year 125,000,000 450,000,000
Accounts payable 349,000,000 325,000,000
Accrued expenses 244,000,000 318,000,000
Payables to affiliates 96,000,000 111,000,000
Customer deposits 138,000,000 136,000,000
Regulatory liabilities 146,000,000 137,000,000
Mark-to-market derivative liabilities 19,000,000 9,000,000
Mark-to-market derivative liabilities with affiliate 506,000,000 503,000,000
Other 117,000,000 82,000,000
Total current liabilities 1,918,000,000 2,071,000,000
Long-term debt 5,091,000,000 5,215,000,000
Long-term debt of variable interest entities 206,000,000 206,000,000
Deferred credits and other liabilities    
Deferred income taxes and unamortized investment tax credits 4,106,000,000 3,993,000,000
Asset retirement obligations 92,000,000 89,000,000
Non-pension postretirement benefit obligations 330,000,000 271,000,000
Regulatory liabilities 3,149,000,000 3,042,000,000
Mark-to-market derivative liabilities 92,000,000 97,000,000
Mark-to-market derivative liabilities with affiliate 0 191,000,000
Other 506,000,000 426,000,000
Total deferred credits and other liabilities 8,275,000,000 8,109,000,000
Total liabilities 15,490,000,000 15,601,000,000
Commitments and contingencies 0 0
Shareholders' equity    
Common stock 1,588,000,000 1,588,000,000
Other paid-in capital 5,016,000,000 5,003,000,000
Retained earnings 491,000,000 447,000,000
Accumulated other comprehensive income (loss), net 0 (1,000,000)
Total shareholders' equity 7,095,000,000 7,037,000,000
Total liabilities and shareholders' equity 22,585,000,000 22,638,000,000
Member's equity    
Accumulated other comprehensive income (loss), net 0 (1,000,000)
Commonwealth Edison Co [Member] | Removal Costs [Member]
    
Current liabilities    
Regulatory liabilities 65,000,000 61,000,000
Deferred credits and other liabilities    
Regulatory liabilities 1,189,000,000 1,185,000,000
Commonwealth Edison Co [Member] | Customer Rate Credit [Member]
    
Current liabilities    
Regulatory liabilities 0  
Deferred credits and other liabilities    
Regulatory liabilities 0  
PECO Energy Co [Member]
    
Current assets    
Cash and cash equivalents 272,000,000 194,000,000
Restricted cash and cash equivalents 5,000,000 2,000,000
Accounts receivable, net    
Customer 307,000,000 380,000,000
Other 230,000,000 376,000,000
Inventories, net    
Fossil fuel 58,000,000 87,000,000
Materials and supplies 21,000,000 18,000,000
Deferred income taxes 31,000,000 25,000,000
Receivable from Exelon intercompany money pool 64,000,000 82,000,000
Prepaid utility taxes 99,000,000 1,000,000
Regulatory assets 54,000,000 39,000,000
Other 50,000,000 39,000,000
Total current assets 1,191,000,000 1,243,000,000
Property, plant and equipment, net 5,960,000,000 5,874,000,000
Deferred debits and other assets    
Regulatory assets 1,216,000,000 1,216,000,000
Investments 21,000,000 22,000,000
Investments in affiliates 8,000,000 8,000,000
Receivable from affiliate 392,000,000 365,000,000
Prepaid pension asset 379,000,000 382,000,000
Other 37,000,000 46,000,000
Total deferred debits and other assets 2,053,000,000 2,039,000,000
Total assets 9,204,000,000 9,156,000,000
Current liabilities    
Short-term notes payable - accounts receivable agreement 225,000,000 225,000,000
Long-term debt due within one year 375,000,000 375,000,000
Accounts payable 198,000,000 262,000,000
Accrued expenses 71,000,000 83,000,000
Payables to affiliates 77,000,000 62,000,000
Customer deposits 52,000,000 53,000,000
Regulatory liabilities 91,000,000 60,000,000
Mark-to-market derivative liabilities with affiliate 0 0
Other 34,000,000 25,000,000
Total current liabilities 1,123,000,000 1,145,000,000
Long-term debt 1,598,000,000 1,597,000,000
Long-term debt of variable interest entities 184,000,000 184,000,000
Deferred credits and other liabilities    
Deferred income taxes and unamortized investment tax credits 2,214,000,000 2,170,000,000
Asset retirement obligations 28,000,000 28,000,000
Non-pension postretirement benefit obligations 303,000,000 288,000,000
Regulatory liabilities 606,000,000 585,000,000
Other 119,000,000 134,000,000
Total deferred credits and other liabilities 3,270,000,000 3,205,000,000
Total liabilities 6,175,000,000 6,131,000,000
Commitments and contingencies 0 0
Preferred securities 87,000,000 87,000,000
Shareholders' equity    
Common stock 2,379,000,000 2,379,000,000
Retained earnings 562,000,000 559,000,000
Accumulated other comprehensive income (loss), net 1,000,000 0
Total shareholders' equity 2,942,000,000 2,938,000,000
Total liabilities and shareholders' equity 9,204,000,000 9,156,000,000
Member's equity    
Accumulated other comprehensive income (loss), net 1,000,000 0
PECO Energy Co [Member] | Removal Costs [Member]
    
Current liabilities    
Regulatory liabilities 0 0
Deferred credits and other liabilities    
Regulatory liabilities 0 0
PECO Energy Co [Member] | Customer Rate Credit [Member]
    
Current liabilities    
Regulatory liabilities 0  
Deferred credits and other liabilities    
Regulatory liabilities 0  
Baltimore Gas and Electric Company [Member]
    
Current assets    
Cash and cash equivalents 53,000,000 49,000,000
Restricted cash and investments of variable interest entity 22,000,000 30,000,000
Accounts receivable, net    
Customer 324,000,000 428,000,000
Other 99,000,000 90,000,000
Income taxes receivable 67,000,000 21,000,000
Inventories, net    
Fossil fuel 35,000,000 74,000,000
Materials and supplies 36,000,000 34,000,000
Prepaid utility taxes 5,000,000 56,000,000
Regulatory assets 179,000,000 174,000,000
Other 8,000,000 12,000,000
Total current assets 828,000,000 968,000,000
Property, plant and equipment, net 5,294,000,000 5,132,000,000
Deferred debits and other assets    
Regulatory assets 550,000,000 550,000,000
Investments 5,000,000  
Investments in affiliates 8,000,000 8,000,000
Prepaid pension asset 490,000,000 514,000,000
Other 25,000,000 33,000,000
Total deferred debits and other assets 1,078,000,000 1,105,000,000
Total assets 7,200,000,000 7,205,000,000
Current liabilities    
Long-term debt due within one year 0 110,000,000
Long-term debt of variable interest entities due within one year 65,000,000 63,000,000
Accounts payable 161,000,000 210,000,000
Accrued expenses 110,000,000 148,000,000
Payables to affiliates 44,000,000 41,000,000
Deferred income taxes 66,000,000 59,000,000
Customer deposits 80,000,000 84,000,000
Regulatory liabilities 22,000,000 18,000,000
Other 59,000,000 25,000,000
Total current liabilities 607,000,000 758,000,000
Long-term debt 1,597,000,000 1,596,000,000
Long-term debt of variable interest entities 258,000,000 258,000,000
Long-term debt of variable interest entity 299,000,000 332,000,000
Deferred credits and other liabilities    
Deferred income taxes and unamortized investment tax credits 1,577,000,000 1,491,000,000
Asset retirement obligations 8,000,000 1,000,000
Non-pension postretirement benefit obligations 211,000,000 212,000,000
Regulatory liabilities 208,000,000 200,000,000
Other 88,000,000 56,000,000
Total deferred credits and other liabilities 2,092,000,000 1,960,000,000
Total liabilities 4,853,000,000 4,904,000,000
Commitments and contingencies 0 0
Shareholders' equity    
Common stock 1,360,000,000 1,294,000,000
Retained earnings 797,000,000 817,000,000
Accumulated other comprehensive income (loss), net 0 0
Total shareholders' equity 2,157,000,000 2,111,000,000
BGE preference stock not subject to mandatory redemption 190,000,000 190,000,000
Total equity 2,347,000,000 2,301,000,000
Total liabilities and shareholders' equity 7,200,000,000 7,205,000,000
Member's equity    
Accumulated other comprehensive income (loss), net 0 0
Baltimore Gas and Electric Company [Member] | Removal Costs [Member]
    
Current liabilities    
Regulatory liabilities 22,000,000 18,000,000
Deferred credits and other liabilities    
Regulatory liabilities 208,000,000 200,000,000
Baltimore Gas and Electric Company [Member] | Customer Rate Credit [Member]
    
Current liabilities    
Regulatory liabilities 0  
Deferred credits and other liabilities    
Regulatory liabilities $ 0  
[1] Current and noncurrent assets are shown net of collateral of $233 million and $424 million, respectively, and current and noncurrent liabilities are shown inclusive of collateral of $(134) million and $(200) million, respectively. The total cash collateral received, net of cash collateral posted and offset against mark-to-market assets and liabilities was $323 million at June 30, 2012.
[2] 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.