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Consolidated Balance Sheets (Unaudited) (USD $)
Dec. 31, 2011
Dec. 31, 2010
Current assets    
Cash and cash equivalents $ 1,016,000,000 $ 1,612,000,000
Restricted cash and investments 40,000,000 30,000,000
Accounts receivable, net    
Customer 1,613,000,000 1,932,000,000
Other 1,000,000,000 1,196,000,000
Mark-to-market derivative assets 432,000,000 487,000,000
Mark-to-market derivative assets with affiliates 0  
Inventories, net    
Fossil fuel 208,000,000 216,000,000
Materials and supplies 656,000,000 590,000,000
Deferred income taxes 97,000,000 0
Regulatory assets 69,000,000 10,000,000
Other 358,000,000 325,000,000
Total current assets 5,489,000,000 6,398,000,000
Property, plant and equipment, net 32,570,000,000 29,941,000,000
Deferred debits and other assets    
Regulatory assets 4,839,000,000 4,140,000,000
Nuclear decommissioning trust funds 6,507,000,000 6,408,000,000
Investments 751,000,000 717,000,000
Investments in affiliates 15,000,000 15,000,000
Goodwill 2,625,000,000 2,625,000,000
Mark-to-market derivative assets 650,000,000 409,000,000
Mark-to-market derivative assets with affiliates 0  
Pledged assets for Zion Station decommissioning 734,000,000 824,000,000
Other 912,000,000 763,000,000
Total deferred debits and other assets 17,033,000,000 15,901,000,000
Total assets 55,092,000,000 52,240,000,000
Current liabilities    
Short-term borrowings 163,000,000 0
Short-term notes payable - accounts receivable agreement 225,000,000 225,000,000
Long-term debt due within one year 828,000,000 599,000,000
Accounts payable 1,444,000,000 1,373,000,000
Accrued expenses 1,255,000,000 1,040,000,000
Payables to affiliates 5,000,000 5,000,000
Deferred income taxes 0 85,000,000
Regulatory liabilities 53,000,000 44,000,000
Mark-to-market derivative liabilities 112,000,000 38,000,000
Dividends payable 349,000,000 1,000,000
Other 560,000,000 835,000,000
Total current liabilities 4,989,000,000 4,240,000,000
Long-term debt 11,799,000,000 11,614,000,000
Long-term debt to financing trusts 390,000,000 390,000,000
Deferred credits and other liabilities    
Deferred income taxes and unamortized investment tax credits 8,351,000,000 6,621,000,000
Asset retirement obligations 3,884,000,000 3,494,000,000
Pension obligations 2,194,000,000 3,658,000,000
Non-pension postretirement benefit obligations 2,263,000,000 2,218,000,000
Spent nuclear fuel obligation 1,019,000,000 1,018,000,000
Regulatory liabilities 3,771,000,000 3,555,000,000
Mark-to-market derivative liabilities 126,000,000 21,000,000
Payable for Zion Station decommissioning 563,000,000 659,000,000
Other 1,268,000,000 1,102,000,000
Total deferred credits and other liabilities 23,439,000,000 22,346,000,000
Total liabilities 40,617,000,000 38,590,000,000
Commitments and contingencies 0 0
Preferred securities 87,000,000 87,000,000
Shareholders' equity    
Common stock 9,107,000,000 9,006,000,000
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 10,055,000,000 9,304,000,000
Accumulated other comprehensive income (loss), net (2,450,000,000) (2,423,000,000)
Total shareholders' equity 14,385,000,000 13,560,000,000
Noncontrolling interest 3,000,000 3,000,000
Total equity 14,388,000,000 13,563,000,000
Total liabilities and shareholders' equity 55,092,000,000 52,240,000,000
Member's equity    
Accumulated other comprehensive income (loss), net (2,450,000,000) (2,423,000,000)
Noncontrolling interest 3,000,000 3,000,000
Exelon Generation Co L L C [Member]
    
Current assets    
Cash and cash equivalents 496,000,000 456,000,000
Restricted cash and cash equivalents 5,000,000 1,000,000
Accounts receivable, net    
Customer 578,000,000 469,000,000
Other 257,000,000 161,000,000
Mark-to-market derivative assets 432,000,000 [1] 487,000,000 [2]
Mark-to-market derivative assets with affiliates 503,000,000 [1] 455,000,000 [2]
Receivables from affiliates 109,000,000 306,000,000
Inventories, net    
Fossil fuel 120,000,000 129,000,000
Materials and supplies 556,000,000 500,000,000
Other 148,000,000 123,000,000
Total current assets 3,204,000,000 3,087,000,000
Property, plant and equipment, net 13,475,000,000 11,662,000,000
Deferred debits and other assets    
Nuclear decommissioning trust funds 6,507,000,000 6,408,000,000
Investments 41,000,000 35,000,000
Receivable from affiliate 1,000,000 1,000,000
Mark-to-market derivative assets 635,000,000 391,000,000
Mark-to-market derivative assets with affiliates 191,000,000 [1] 525,000,000 [2]
Prepaid pension asset 2,068,000,000 1,236,000,000
Pledged assets for Zion Station decommissioning 734,000,000 824,000,000
Other 577,000,000 365,000,000
Total deferred debits and other assets 10,754,000,000 9,785,000,000
Total assets 27,433,000,000 24,534,000,000
Current liabilities    
Short-term borrowings 2,000,000  
Long-term debt due within one year 3,000,000 3,000,000
Accounts payable 753,000,000 749,000,000
Accrued expenses 779,000,000 391,000,000
Payables to affiliates 58,000,000 47,000,000
Deferred income taxes 244,000,000 427,000,000
Mark-to-market derivative liabilities 103,000,000 [1] 34,000,000 [2]
Other 202,000,000 192,000,000
Total current liabilities 2,144,000,000 1,843,000,000
Long-term debt 3,674,000,000 3,676,000,000
Deferred credits and other liabilities    
Deferred income taxes and unamortized investment tax credits 3,966,000,000 3,318,000,000
Asset retirement obligations 3,767,000,000 3,357,000,000
Non-pension postretirement benefit obligations 703,000,000 692,000,000
Spent nuclear fuel obligation 1,019,000,000 1,018,000,000
Payables to affiliates 2,222,000,000 2,267,000,000
Mark-to-market derivative liabilities 29,000,000 21,000,000
Payable for Zion Station decommissioning 563,000,000 659,000,000
Other 638,000,000 506,000,000
Total deferred credits and other liabilities 12,907,000,000 11,838,000,000
Total liabilities 18,725,000,000 17,357,000,000
Commitments and contingencies 0 0
Shareholders' equity    
Accumulated other comprehensive income (loss), net 915,000,000 1,013,000,000
Noncontrolling interest 5,000,000 5,000,000
Member's equity    
Membership interest 3,556,000,000 3,526,000,000
Undistributed earnings 4,232,000,000 2,633,000,000
Accumulated other comprehensive income (loss), net 915,000,000 1,013,000,000
Total member's equity 8,703,000,000 7,172,000,000
Noncontrolling interest 5,000,000 5,000,000
Total equity 8,708,000,000 7,177,000,000
Total liabilities and equity 27,433,000,000 24,534,000,000
Commonwealth Edison Co [Member]
    
Current assets    
Cash and cash equivalents 234,000,000 50,000,000
Restricted cash and cash equivalents 3,000,000 0
Accounts receivable, net    
Customer 655,000,000 768,000,000
Other 385,000,000 525,000,000
Inventories, net    
Inventories, net 81,000,000 72,000,000
Deferred income taxes 76,000,000 115,000,000
Counterparty collateral deposited 90,000,000 153,000,000
Regulatory assets 560,000,000 456,000,000
Other 22,000,000 12,000,000
Total current assets 2,106,000,000 2,151,000,000
Property, plant and equipment, net 13,121,000,000 12,578,000,000
Deferred debits and other assets    
Regulatory assets 796,000,000 947,000,000
Investments 21,000,000 23,000,000
Investments in affiliates 6,000,000 6,000,000
Goodwill 2,625,000,000 2,625,000,000
Receivable from affiliate 1,860,000,000 1,895,000,000
Mark-to-market derivative assets 0 4,000,000
Prepaid pension asset 1,803,000,000 1,039,000,000
Other 315,000,000 384,000,000
Total deferred debits and other assets 7,426,000,000 6,923,000,000
Total assets 22,653,000,000 21,652,000,000
Current liabilities    
Short-term borrowings 0 0
Long-term debt due within one year 450,000,000 347,000,000
Accounts payable 325,000,000 332,000,000
Accrued expenses 318,000,000 366,000,000
Payables to affiliates 111,000,000 398,000,000
Customer deposits 136,000,000 130,000,000
Regulatory liabilities 12,000,000 19,000,000
Mark-to-market derivative liabilities 9,000,000 0
Mark-to-market derivative liabilities with affiliate 503,000,000 450,000,000
Other 82,000,000 92,000,000
Total current liabilities 1,946,000,000 2,134,000,000
Long-term debt 5,215,000,000 4,654,000,000
Long-term debt to financing trusts 206,000,000 [3] 206,000,000
Deferred credits and other liabilities    
Deferred income taxes and unamortized investment tax credits 4,008,000,000 3,308,000,000
Asset retirement obligations 89,000,000 105,000,000
Non-pension postretirement benefit obligations 271,000,000 271,000,000
Regulatory liabilities 3,167,000,000 3,137,000,000
Mark-to-market derivative liabilities 97,000,000  
Mark-to-market derivative liabilities with affiliate 191,000,000 525,000,000
Other 426,000,000 402,000,000
Total deferred credits and other liabilities 8,249,000,000 7,748,000,000
Total liabilities 15,616,000,000 14,742,000,000
Commitments and contingencies 0 0
Shareholders' equity    
Common stock 1,588,000,000 1,588,000,000
Other paid-in capital 5,003,000,000 4,992,000,000
Retained earnings 447,000,000 331,000,000
Accumulated other comprehensive income (loss), net (1,000,000) (1,000,000)
Total shareholders' equity 7,037,000,000 6,910,000,000
Total liabilities and shareholders' equity 22,653,000,000 21,652,000,000
Member's equity    
Accumulated other comprehensive income (loss), net (1,000,000) (1,000,000)
PECO Energy Co [Member]
    
Current assets    
Cash and cash equivalents 194,000,000 522,000,000
Restricted cash and cash equivalents 2,000,000 0
Accounts receivable, net    
Customer 380,000,000 695,000,000
Other 376,000,000 277,000,000
Inventories, net    
Fossil fuel 87,000,000 87,000,000
Materials and supplies 18,000,000 18,000,000
Deferred income taxes 25,000,000 41,000,000
Receivable from Exelon intercompany money pool 82,000,000 0
Regulatory assets 12,000,000 9,000,000
Other 40,000,000 21,000,000
Total current assets 1,216,000,000 1,670,000,000
Property, plant and equipment, net 5,874,000,000 5,620,000,000
Deferred debits and other assets    
Regulatory assets 1,243,000,000 968,000,000
Investments 22,000,000 20,000,000
Investments in affiliates 8,000,000 8,000,000
Receivable from affiliate 365,000,000 375,000,000
Prepaid pension asset 382,000,000 281,000,000
Other 46,000,000 43,000,000
Total deferred debits and other assets 2,066,000,000 1,695,000,000
Total assets 9,156,000,000 8,985,000,000
Current liabilities    
Short-term notes payable - accounts receivable agreement 225,000,000 225,000,000
Long-term debt due within one year 375,000,000 250,000,000
Long-term debt to PECO Energy Transition Trust due within one year 0 0
Accounts payable 262,000,000 201,000,000
Accrued expenses 83,000,000 95,000,000
Payables to affiliates 62,000,000 275,000,000
Deferred income taxes 0 0
Customer deposits 53,000,000 65,000,000
Regulatory liabilities 41,000,000 25,000,000
Mark-to-market derivative liabilities 0 4,000,000
Mark-to-market derivative liabilities with affiliate 0 5,000,000
Other 25,000,000 18,000,000
Total current liabilities 1,126,000,000 1,163,000,000
Long-term debt 1,597,000,000 1,972,000,000
Long-term debt to financing trusts 184,000,000 184,000,000
Deferred credits and other liabilities    
Deferred income taxes and unamortized investment tax credits 2,170,000,000 1,823,000,000
Asset retirement obligations 28,000,000 32,000,000
Non-pension postretirement benefit obligations 288,000,000 292,000,000
Regulatory liabilities 604,000,000 418,000,000
Mark-to-market derivative liabilities 0 0
Mark-to-market derivative liabilities with affiliate 0 0
Other 134,000,000 131,000,000
Total deferred credits and other liabilities 3,224,000,000 2,696,000,000
Total liabilities 6,131,000,000 6,015,000,000
Commitments and contingencies 0 0
Preferred securities 87,000,000 87,000,000
Shareholders' equity    
Common stock 2,379,000,000 2,361,000,000
Receivable from parent 0 0
Retained earnings 559,000,000 522,000,000
Accumulated other comprehensive income (loss), net 0 0
Total shareholders' equity 2,938,000,000 2,883,000,000
Total liabilities and shareholders' equity 9,156,000,000 8,985,000,000
Member's equity    
Accumulated other comprehensive income (loss), net $ 0 $ 0
[1] 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.
[2] Current and noncurrent assets are shown net of collateral of $725 million and $199 million, respectively, and current and noncurrent liabilities are shown inclusive of collateral of $10 million and $17 million, respectively. The total cash collateral received net of cash collateral posted and offset against mark-to-market assets and liabilities was $951 million at December 31, 2010.
[3] Amount owed to this financing trust is recorded as debt to financing trust within ComEd's Consolidated Balance Sheets.