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Supplemental Financial Information (Tables)
 9 Months Ended
Sep. 30, 2012
Supplemental Financial Information Tables [Line Items]  
Components of non-operating income and expenses
Three Months Ended September 30, 2012Exelon Generation ComEd PECO BGE
Other, Net              
Decommissioning-related activities:              
 Net realized income on decommissioning trust funds —              
  Regulatory Agreement Units(a) $33 $33 $0 $0 $0
  Non-Regulatory Agreement Units(a)  10  10  0  0  0
 Net unrealized gains on decommissioning trust funds —              
  Regulatory Agreement Units 202  202  0  0  0
  Non-Regulatory Agreement Units 71  71  0  0  0
 Net unrealized gains on pledged assets -               
  Zion Station decommissioning 22  22  0  0  0
 Regulatory offset to decommissioning trust fund-related              
  activities(b)  (208)  (208)  0  0  0
Total decommissioning-related activities 130  130  0  0  0
Investment income 5  1  0  0  3
Long-term lease income  7  0  0  0  0
Interest income related to uncertain income tax positions 0  1  1  0  0
Credit facility termination fees (43)  (43)  0  0  0
AFUDC - Equity 4  0  1  1  2
Other  (2)  (6)  3  1  0
                 
Other, net $101 $83 $5 $2 $5
               
                 
Nine Months Ended September 30, 2012Exelon Generation ComEd PECO BGE
Other, Net              
Decommissioning-related activities:              
 Net realized income on decommissioning trust funds —              
  Regulatory Agreement Units(a) $143 $143 $0 $0 $0
  Non-Regulatory Agreement Units(a)  77  77  0  0  0
 Net unrealized gains on decommissioning trust funds —              
  Regulatory Agreement Units 352  352  0  0  0
  Non-Regulatory Agreement Units 101  101  0  0  0
 Net unrealized gains on pledged assets -               
  Zion Station decommissioning 60  60  0  0  0
 Regulatory offset to decommissioning trust fund-related              
  activities(b)  (453)  (453)  0  0  0
Total decommissioning-related activities 280  280  0  0  0
Investment income 15  2  1  2  9
Long-term lease income  22  0  0  0  0
Interest income related to uncertain income tax positions 14  1  1  0  0
Credit facility termination fees (85)  (85)  0  0  0
AFUDC - Equity 11  0  2  3  8
Other  (4)  (13)  8  1  1
                 
Other, net $253 $185 $12 $6 $18
                 

Three Months Ended September 30, 2011Exelon Generation ComEd PECO BGE
Other, Net              
Decommissioning-related activities:              
 Net realized income on decommissioning trust funds (a)              
  Regulatory Agreement Units$16 $16 $0 $0 $0
  Non-Regulatory Agreement Units 13  13  0  0  0
 Net unrealized losses on decommissioning trust funds               
  Regulatory Agreement Units (363)  (363)  0  0  0
  Non-Regulatory Agreement Units (141)  (141)  0  0  0
 Net unrealized losses on pledged assets              
  Zion Station decommissioning (4)  (4)  0  0  0
 Regulatory offset to decommissioning trust fund-related              
  activities(b)  281  281  0  0  0
Total decommissioning-related activities (198)  (198)  0  0  0
Investment income 1  0  0  1  3
Long-term lease income  7  0  0  0  0
Interest income related to uncertain income tax positions 7  0  12  0  0
AFUDC - Equity 4  0  2  2  4
Bargain purchase gain related to Wolf Hollow acquisition 36  36  0  0  0
Other  1  (2)  2  0  1
                 
Other, net $(142) $(164) $16 $3 $8
               
Nine Months Ended September 30, 2011Exelon Generation ComEd PECO BGE
Other, Net              
Decommissioning-related activities:              
 Net realized income on decommissioning trust funds (a)              
  Regulatory Agreement Units$97 $97 $0 $0 $0
  Non-Regulatory Agreement Units 39  39  0  0  0
 Net unrealized losses on decommissioning trust funds               
  Regulatory Agreement Units (223)  (223)  0  0  0
  Non-Regulatory Agreement Units (88)  (88)  0  0  0
 Net unrealized income on pledged assets              
  Zion Station decommissioning 41  41  0  0  0
 Regulatory offset to decommissioning trust fund-related              
  activities(b)  60  60  0  0  0
Total decommissioning-related activities (74)  (74)  0  0  0
Investment income 3  0  0  3  10
Long-term lease income  21  0  0  0  0
Interest income related to uncertain income tax positions 53  33  13  1  0
AFUDC - Equity 14  0  6  8  11
Bargain purchase gain related to Wolf Hollow acquisition 36  36  0  0  0
Other  1  (7)  5  (1)  1
                 
Other, net $54 $(12) $24 $11 $22
                 

__________

(a)       Includes investment income and realized gains and losses on sales of investments of the trust funds.

(b)       Includes the elimination of NDT fund-related activity for the Regulatory Agreement Units, including the elimination of net realized income taxes related to all NDT fund activity for those units. See Note 12 of the Exelon 2011 Form 10-K for additional information regarding the accounting for nuclear decommissioning.
Components of depreciation, amortization and accretion, and other, net
                 
Nine Months Ended September 30, 2012Exelon Generation ComEd PECO BGE
Depreciation, amortization, accretion and depletion              
Property, plant and equipment$ 1,263 $540 $396 $154 $184
Regulatory assets  89  0  62  7  34
Amortization of intangible assets  24  24  0  0  0
Amortization of energy contract assets and liabilities (a)  731  811  0  0  0
Nuclear fuel (a)  628  629  0  0  0
Asset retirement obligation accretion (b)  174  174  0  0  0
                 
Total depreciation, amortization, accretion and depletion$ 2,909 $ 2,178 $ 458 $ 161 $218
                 
Nine Months Ended September 30, 2011Exelon Generation ComEd PECO BGE
Depreciation, amortization and accretion              
Property, plant and equipment$947 $416 $374 $141 $170
Regulatory assets 40  0  31  9  35
Nuclear fuel (a) 556  556  0  0  0
Asset retirement obligation accretion (b) 159  159  0  0  0
                 
Total depreciation, amortization and accretion$ 1,702 $ 1,131 $ 405 $ 150 $ 205

__________

(a)       Included in purchased power and fuel expense, or operating revenues on the Registrants' Consolidated Statements of Operations and Comprehensive Income.

(b)       Included in operating and maintenance expense on the Registrants' Consolidated Statements of Operations and Comprehensive Income.

 
Cash Flow Supplemental Disclosures
Nine Months Ended September 30, 2012Exelon Generation ComEd PECO BGE
Other non-cash operating activities:              
Pension and non-pension postretirement benefit costs$606 $259 $212 $38 $44
Provision for uncollectible accounts 120  14  38  46  28
Stock-based compensation costs 75  0  0  0  0
Other decommissioning-related activity (a) (108)  (108)  0  0  0
Energy-related options (b) 119  119  0  0  0
Amortization of regulatory asset related to debt costs 13  0  10  2  1
Amortization of rate stabilization deferral 39  0  0  0  49
 Amortization of debt fair value adjustment(49)  (23)  0  0  0
Discrete impacts from EIMA (c) 43  0  43  0  0
Merger-related commitments (d) 179  35  0  0  28
 Severance cost 120  34  0  1  0
Equity in losses of unconsolidated subsidiaries 69  69  0  0  0
Other 9  23  7  9  (3)
               
Total other non-cash operating activities$1,235 $422 $310 $96 $147
                
Changes in other assets and liabilities:              
Under/over-recovered energy and transmission costs 20  0  21  (3)  21
Other regulatory assets and liabilities (463)  0  (65)  7  (89)
Other current assets 52  (85)  (8)  (56)(e)(25)
Other noncurrent assets and liabilities (40)  (110)  (72)  (5)  7
                
Total changes in other assets and liabilities$(431) $(195) $(124) $(57) $(86)
                
Non-cash investing and financing activities:              
Merger with Constellation, common stock issued$7,365 $5,258 $0 $0 $0
                
 Total non-cash investing and financing activities:$7,365 $5,258 $0 $0 $0

Nine Months Ended September 30, 2011Exelon Generation ComEd PECO BGE
Other non-cash operating activities:              
Pension and non-pension postretirement benefit costs$407 $187 $160 $24 $43
Provision for uncollectible accounts 97  0  49  48  31
Stock-based compensation costs 55  0  0  0  0
Other decommissioning-related activity (a) 62  62  0  0  0
Energy-related options (b) 102  102  0  0  0
Amortization of regulatory asset related to debt costs 16  0  14  2  1
Amortization of rate stabilization deferral 0  0  0  0  45
Deferral of storm costs 0  0  0  0  (16)
Uncollectible accounts recovery, net  14  0  14  0  0
Discrete impacts from 2010 Rate Case Order (f) (32)  0  (32)  0  0
Bargain purchase gain related to Wolf Hollow Acquisition (36)  (36)  0  0  0
Other 18  47  5  0  (6)
               
Total other non-cash operating activities$703 $362 $210 $74 $98
               
Changes in other assets and liabilities:              
Under/over-recovered energy and transmission costs (9)  0  (20)  11  (25)
Other regulatory assets and liabilities 0  0  12  13  13
Other current assets  (166)  (46)  (13)  (59)(e) (92)
Other noncurrent assets and liabilities 83  (19)  50  7  (50)
               
Total changes in other assets and liabilities$(92) $(65) $29 $(28) $(154)

_________

(a)       Includes the elimination of NDT fund-related activity for the Regulatory Agreement Units, including the elimination of operating revenues, ARO accretion, ARC amortization, investment income and income taxes related to all NDT fund activity for these units. See Note 12 of the Exelon 2011 Form 10-K for additional information regarding the accounting for nuclear decommissioning.

(b)       Includes option premiums reclassified to realized at the settlement of the underlying contracts and recorded to results of operations.

(c)              Includes the establishment of a regulatory asset, pursuant to EIMA, which represents the ICC's approved distribution formula and associated rulings as of September 30, 2012 and ComEd's best estimate of the probable increase in distribution rates to provide recovery of prudent and reasonable costs incurred for the twelve months ended December 31, 2011 and the nine months ended September 30, 2012. See Note 4 - Regulatory Matters for more information.

(d) See Note 3 - Mergers and Acquisitions for more information on merger-related commitments.

(e)       Relates primarily to prepaid utility taxes.

(f)              In May 2011, as a result of the 2010 Rate Case order, ComEd recorded one-time net benefits to reestablish previously expensed plant balances and to recover previously incurred costs related to Exelon's 2009 restructuring plan. See Note 4 - Regulatory Matters for more information.

 
Supplemental Balance Sheet Disclosures
September 30, 2012Exelon   Generation   ComEd  PECO  BGE
Property, plant and equipment:                
Accumulated depreciation and amortization$ 11,890(a) $5,910(a) $2,906 $2,765 $2,579
Accounts receivable:                
Allowance for uncollectible accounts 310   85   81  109  35
                 
December 31, 2011Exelon   Generation   ComEd  PECO  BGE
Property, plant and equipment:                
Accumulated depreciation and amortization$ 10,959(b) $5,313(b) $2,750 $2,662 $2,465
Accounts receivable:                
Allowance for uncollectible accounts 199   29   78  92  38

___________

(a)       Includes accumulated amortization of nuclear fuel in the reactor core of $2,161 million.

(b)       Includes accumulated amortization of nuclear fuel in the reactor core of $1,784 million.

 
Accumulated Other Comprehensive Income Net Of Taxes
September 30, 2012Exelon  Generation  ComEd  PECO  BGE
Accumulated other comprehensive income (loss)              
Net unrealized gain on cash flow hedges$459 $730 $0 $0 $0
Pension and non-pension postretirement benefit plans (2,887)  0  0  0  0
Other comprehensive income—equity investment in CENG 23  23  0  0  0
Unrealized gain (loss) on marketable securities 0  (1)  0  1  0
                 
Total accumulated other comprehensive income (loss)$(2,405) $752 $0 $1 $0
                 
December 31, 2011Exelon  Generation  ComEd  PECO  BGE
Accumulated other comprehensive income (loss)              
Net unrealized gain on cash flow hedges$488 $915 $0 $0 $0
Pension and non-pension postretirement benefit plans (2,938)  0  0  0  0
Unrealized loss on marketable securities 0  0  (1)  0  0
                 
Total accumulated other comprehensive income (loss)$(2,450) $915 $(1) $0 $0