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Supplemental Financial Information (Tables)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Supplemental Financial Information Tables [Line Items]      
Components of taxes other than income
For the Year Ended December 31, 2012Exelon Generation ComEd PECO BGE
Taxes other than income              
Utility (a)$463 $82 $239 $141 $75
Property 227  189  22  13  111
Payroll 131  78  26  12  18
Other 198  20  8  (4)  4
                 
Total taxes other than income$1,019 $369 $295 $162 $208

For the Year Ended December 31, 2011Exelon Generation ComEd PECO BGE
Taxes other than income              
Utility (a)$ 443 $27 $243 $173 $79
Property  177  146  22  9  107
Payroll  123  71  25  13  17
Other  42  20  6  10  4
                 
Total taxes other than income$ 785 $ 264 $ 296 $ 205 $ 207

For the Year Ended December 31, 2010Exelon Generation ComEd PECO BGE
Taxes other than income              
Utility (a)$ 476 $0 $205 $271 $79
Property  175  142  20  13  102
Payroll  121  70  24  12  16
Other  36  18  7  7  3
                 
Total taxes other than income$ 808 $ 230 $ 256 $ 303 $ 200

 

(a)       Generation's utility tax represents gross receipts tax related to its retail operations and ComEd's, PECO's and BGE's utility taxes represent municipal and state utility taxes and gross receipts taxes related to their operating revenues, respectively. The offsetting collection of utility taxes from customers is recorded in revenues on the Registrants' Consolidated Statements of Operations.

 

    
Components of non-operating income and expenses
For the Year Ended December 31, 2012Exelon Generation ComEd PECO BGE 
Other, Net               
Decommissioning-related activities:               
 Net realized income on decommissioning trust funds (a) -               
  Regulatory Agreement Units$189 $189 $0 $0 $0 
  Non-Regulatory Agreement Units 102  102  0  0  0 
 Net unrealized gains on decommissioning trust funds —               
  Regulatory Agreement Units 386  386  0  0  0 
  Non-Regulatory Agreement Units 105  105  0  0  0 
 Net unrealized gains on pledged assets —               
  Zion Station decommissioning 73  73  0  0  0 
 Regulatory offset to decommissioning trust fund-related               
  activities(b)  (530)  (530)  0  0  0 
Total decommissioning-related activities 325  325  0  0  0 
Investment income 20  3  1  2  11(c)
Long-term lease income 29  0  0  0  0 
Interest income related to uncertain income tax positions 15  2  20  0  0 
AFUDC - Equity 17  0  6  4  10 
Credit facility termination fees (85)  (85)  0  0  0 
Other  25  (6)  12  2  2 
                  
Other, net $346 $239 $39 $8 $23 

For the Year Ended December 31, 2011Exelon Generation ComEd PECO BGE 
Other, Net               
Decommissioning-related activities:               
 Net realized income on decommissioning trust funds (a) -               
  Regulatory Agreement Units$177 $177 $0 $0 $0 
  Non-Regulatory Agreement Units 45  45  0  0  0 
 Net unrealized losses on decommissioning trust funds —               
  Regulatory Agreement Units (74)  (74)  0  0  0 
  Non-Regulatory Agreement Units (4)  (4)  0  0  0 
 Net unrealized gains on pledged assets —               
  Zion Station decommissioning 48  48  0  0  0 
 Regulatory offset to decommissioning trust fund-related               
  activities(b)  (130)  (130)  0  0  0 
Total decommissioning-related activities 62  62  0  0  0 
Investment income 10  1  1  3  13(c)
Long-term lease income  28  0  0  0  0 
Interest income related to uncertain income tax positions 53  31  14  1  0 
AFUDC - Equity 17  0  8  9  15 
Bargain purchase gain related to Wolf Hollow acquisition 36  36  0  0  0 
Other  (3)  (8)  6  1  (2) 
                  
Other, net $203 $122 $29 $14 $26 

For the Year Ended December 31, 2010Exelon Generation ComEd PECO BGE  
Other, Net                
Decommissioning-related activities:                
 Net realized income on decommissioning trust funds (a) -                
  Regulatory Agreement Units$176 $176 $0 $0 $0  
  Non-Regulatory Agreement Units 51  51  0  0  0  
 Net unrealized gains on decommissioning trust funds —                
  Regulatory Agreement Units 316  316  0  0  0  
  Non-Regulatory Agreement Units 104  104  0  0  0  
 Regulatory offset to decommissioning trust fund-related                
  activities(b)  (394)  (394)  0  0  0  
Total decommissioning-related activities 253  253  0  0  0  
Investment income 1  0  0  1  15(c) 
Long-term lease income  27  0  0  0  0  
Interest income related to uncertain income tax positions 0  0  6  0  0  
AFUDC - Equity 11  0  4  7  10  
Realized gain on Rabbi trust investments 1  0  1  0  0  
Other  19  4  13  0  0  
                   
Other, net $312 $257 $24 $8 $25  

 

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

(b)        Includes the elimination of NDT fund activity for the Regulatory Agreement Units, including the elimination of net income taxes related to all NDT fund activity for those units. See Note 13 - Asset Retirement Obligations for additional information regarding the accounting for nuclear decommissioning.

(c)       Relates to the cash return on BGE's rate stabilization deferral. See Note 3 – Regulatory Matters for additional information regarding the rate stabilization deferral. )

    
Components of depreciation, amortization and accretion, and other, net
For the Year Ended December 31, 2012Exelon Generation ComEd PECO  BGE
Depreciation, amortization and accretion               
Property, plant and equipment$ 1,712 $733 $525 $207  $245
Regulatory assets  129  0  80  10   53
Amortization of intangible assets, net  40  35  5  0   0
Amortization of energy contract assets and liabilities(a)  1,110  1,110  0  0   0
Nuclear fuel(a)  848  848  0  0   0
ARO accretion(b)  240  240  0  0   0
                  
Total depreciation, amortization and accretion$ 4,079 $ 2,966 $ 610 $ 217  $298

For the Year Ended December 31, 2011Exelon Generation ComEd PECO  BGE
Depreciation, amortization and accretion               
Property, plant and equipment$1,284 $570 $502 $191  $224
Regulatory assets 63  0  52  11   50
Nuclear fuel(a) 755  755  0  0   0
ARO accretion(b) 214  214  0  0   0
                  
Total depreciation, amortization and accretion$ 2,316 $ 1,539 $ 554 $ 202  $ 274

For the Year Ended December 31, 2010Exelon Generation ComEd PECO  BGE
Depreciation, amortization and accretion               
Property, plant and equipment$1,144 $474 $473 $171  $214
Regulatory assets 931  0  43  889(c)  35
Nuclear fuel(a) 672  672  0  0   0
ARO accretion(b) 196  195  1  0   0
                  
Total depreciation, amortization and accretion$ 2,943 $ 1,341 $ 517 $ 1,060  $ 249

 

(a)       Included in revenues or fuel expense on the Registrants' Consolidated Statements of Operations.

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

(c)       For PECO, primarily reflects CTC amortization.

 

 

    
Cash Flow Supplemental Disclosures
For the Year Ended December 31, 2012Exelon Generation ComEd PECO BGE
                 
Cash paid (refunded) during the year:              
Interest (net of amount capitalized)$761 $286 $288 $113 $136
Income taxes (net of refunds) (171)  175  (42)  (64)  (112)
                 
Other non-cash operating activities:              
Pension and non-pension postretirement benefit costs$820 $341 $282 $50 $57
Loss in equity method investments 91  91  0  0  0
Provision for uncollectible accounts 164  22  42  60  44
Provision for obsolete inventory 6  6  1  0  0
Stock-based compensation costs 94  0  0  0  0
Other decommissioning-related activity (a) (145)  (145)  0  0  0
Energy-related options (b) 160  160  0  0  0
Amortization of regulatory asset related to debt costs 18  0  13  3  2
Amortization of rate stabilization deferral 57  0  0  0  67
Amortization of debt fair value adjustment (34)  (34)  0  0  0
Merger-related commitments (d)  141  32  0  0  27
Severance cost 99  34  0  0  0
Discrete impacts from Energy Infrastructure              
Modernization Act (EIMA) (c) (96)  0  (96)  0  0
Amortization of debt costs 19  11  5  3  2
Other (11)  19  5  9  (6)
                
Total other non-cash operating activities$1,383 $537 $252 $125 $193
               
Changes in other assets and liabilities:              
Under/over-recovered energy and transmission costs$71 $0 $28 $20 $26
Other regulatory assets and liabilities (404)  0  (68)  18  (112)
Other current assets 213  (30)  (7)  (12)  (7)
Other noncurrent assets and liabilities (248)  (98)  (95)  (10)  8
                 
Total changes in other assets and liabilities$(368) $(128) $(142) $16 $(85)

 Exelon Generation ComEd PECO BGE
Non-cash investing and financing activities:              
Change in ARC$781 $781 $2 $0 $0
Change in capital expenditures not paid 160  103(e) 15  26  (4)
Merger with Constellation, common stock issued 7,365  5,264  0  0  0
               

 

(a)       Includes the elimination of NDT fund 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 13 - Asset Retirement Obligations for additional information regarding the accounting for nuclear decommissioning.

(b)       Includes amounts reclassified to realized at settlement of contracts recorded to results of operations related to option premiums due to the settlement of underlying transactions.

(c)       Includes the regulatory asset, pursuant to EIMA, which represents the ICC's approved distribution formula and associated rulings as of December 31, 2012 and ComEd's best estimate of the probable increase in distribution rates to provide recovery of prudent and reasonable costs incurred for the 12 months ended December 31, 2012.

(d)       See Note 4 – Mergers and Acquisitions for more information on merger-related commitments.

(e)       Includes $247 million of capital expenditures not paid as of December 31, 2012 related to Antelope Valley.

 
For the Year Ended December 31, 2011Exelon Generation ComEd PECO BGE
                 
Cash paid (refunded) during the year:              
Interest (net of amount capitalized)$649 $158 $296 $128 $122
Income taxes (net of refunds) (457)  347  (676)  (65)  (54)
                 
Other non-cash operating activities:              
Pension and non-pension postretirement benefit costs$542 $249 $213 $32 $51
Provision for uncollectible accounts 121  0  57  64  44
Stock-based compensation costs 67  0  0  0  0
Other decommissioning-related activity (a) 16  16  0  0  0
Energy-related options (b) 137  137  0  0  0
Amortization of regulatory asset related to debt costs 21  0  18  3  2
Amortization of rate stabilization deferral 0  0  0  0  57
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 (c) (32)  0  (32)  0  0
Bargain purchase gain related to Wolf Hollow Acquisition (36)  (36)  0  0  0
Discrete impacts from Energy Infrastructure              
Modernization Act (EIMA) (d) (82)  0  (82)  0  0
Other 2  55  (4)  1  (9)
                
Total other non-cash operating activities$770 $421 $184 $100 $129
               
Changes in other assets and liabilities:              
Under/over-recovered energy and transmission costs$(45) $0 $(49) $4 $(52)
Other regulatory assets and liabilities 0  0  44  26  10
Other current assets (101)  (23)  (14)  (12)  (88)
Other noncurrent assets and liabilities 122  (34)  64  (4)  (31)
                 
Total changes in other assets and liabilities$(24) $(57) $45 $14 $(161)

 Exelon Generation ComEd PECO BGE
Non-cash investing and financing activities:              
Change in ARC$186 $186 $0 $0 $0
Change in capital expenditures not paid 96  125(e) 7  (35)  (7)
               

 

(a)       Includes the elimination of NDT fund 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 13 - Asset Retirement Obligations for additional information regarding the accounting for nuclear decommissioning.

(b)       Includes amounts reclassified to realized at settlement of contracts recorded to results of operations related to option premiums due to the settlement of underlying transactions.

(c)        In May 2011, as a result of the 2010 Rate Case order, ComEd recorded one-time benefits to reestablish previously expensed plant balances and to recover previously incurred costs related to Exelon's 2009 restructuring plan. See Note 3 - Regulatory Matters for more information.

(d)       Includes the establishment of a regulatory asset, pursuant to EIMA, for the 2011 annual reconciliation in ComEd's distribution formula rate tariff and the deferral of costs associated with significant 2011 storms, partially offset by an accrual to fund a new Science and Technology Innovation Trust. See Note 3 - Regulatory Matters for more information.

(e)       Includes $120 million of capital expenditures not paid as of December 31, 2011 related to Antelope Valley.
For the Year Ended December 31, 2010Exelon Generation ComEd PECO BGE
                 
Cash paid (refunded) during the year:              
Interest (net of amount capitalized)$665(a)$145 $283 $168 $128
Income taxes (net of refunds) 1,219  732  15  433  (76)
               
Other non-cash operating activities:              
Pension and non-pension postretirement benefit costs$581 $268 $215 $46 $48
Provision for uncollectible accounts 108  1  48  59  38
Provision for obsolete inventory 12  12  0  0  0
Stock-based compensation costs 44  0  0  0  0
Other decommissioning-related activity (b) (91)  (91)  0  0  0
Energy-related options (c) (73)  (73)  0  0  0
ARO adjustment  (19)  (8)  (10)  (1)  0
Amortization of regulatory asset related to debt costs 24  0  20  4  2
Amortization of rate stabilization deferral 0  0  0  0  62
Accrual for Illinois utility distribution tax refund (d) (25)  0  (25)  0  0
Under-recovered uncollectible accounts, net (e) (14)  0  (14)  0  0
ARP SO2 allowances impairment 57  57  0  0  0
Other 5  16  4  0  (6)
                
Total other non-cash operating activities$609 $182 $238 $108 $144
               
Changes in other assets and liabilities:              
Under/over-recovered energy and transmission costs$61 $0 $58 $3 $6
Other regulatory assets and liabilities 0  0  (19)  35  (64)
Other current assets (18)  (16)  12  (19)  (7)
Other noncurrent assets and liabilities (99)  (29)  (184)(f) 59  2
                 
Total changes in other assets and liabilities$(56) $(45) $(133) $78 $(63)

 Exelon Generation ComEd PECO BGE
Non-cash investing and financing activities:              
Change in ARC$(428) $(428) $0 $0 $0
Change in capital expenditures not paid 34  13  7  14  28
Purchase accounting adjustments 9  9  0  0  0
Exelon Wind acquisition (g) 32  32  0  0  0

 

(a)       Excludes $167 million of interest paid to the IRS relating to a preliminary agreement reached during the third quarter of 2010. See Note 12 - Income Taxes for addition information.

(b)        Includes the elimination of NDT fund 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 13 - Asset Retirement Obligations for additional information regarding the accounting for nuclear decommissioning.

(c)       Includes amounts reclassified to realized at settlement of contracts recorded to results of operations related to option premiums due to the settlement of underlying transactions.

(d)       During the second quarter of 2010, ComEd recorded a reduction of $25 million to taxes other than income to reflect management's estimate of future refunds for the 2008 and 2009 tax years associated with Illinois' utility distribution tax based on an analysis of past refunds and interpretations of the Illinois Public Utility Act. Historically, ComEd has recorded refunds of the Illinois utility distribution tax when received. ComEd believes it now has sufficient, reliable evidence to record and support an estimated receivable associated with the anticipated refund for the 2008 and 2009 tax years.

(e)       Includes $70 million of under-recovered uncollectible accounts expense from 2008 and 2009 recorded in the first quarter of 2010 as well as $59 million of amortization of the associated regulatory asset. This amount also includes a credit of $3 million of under collections associated with 2010 activity. ComEd is recovering these costs through a rider mechanism authorized by the ICC. See Note 3 - Regulatory Matters for additional information regarding the Illinois legislation for recovery of uncollectible accounts.

(f)       Relates primarily to a decrease in interest payable associated with a change in uncertain income tax positions. See Note 12 - Income Taxes for additional information.

(g)       Represents contingent liability recorded in connection with the December 9, 2010 acquisition of Exelon Wind. See Note 4 - Acquisition for additional information.

 

DOE Smart Grid Investment Grant (Exelon, PECO and BGE). For the year ended December 31, 2012, Exelon, PECO and BGE have included in the capital expenditures line item under investing activities of the cash flow statement capital expenditures of $103 million, $56 million and $47 million, respectively, and reimbursements of $113 million, $66 million and $47 million, respectively, related to PECO's and BGE's DOE SGIG programs. For the year ended December 31, 2011, Exelon, PECO and BGE have included in the capital expenditures line item under investing activities of the cash flow statement capital expenditures of $51 million, $51 million and $23 million, respectively, and reimbursements of $56 million, $56 million and $41 million, respectively, related to PECO's and BGE's DOE SGIG programs. See Note 3 - Regulatory Matters for additional information regarding the DOE SGIG.

 

 
Investments Table Text Block
December 31, 2012Exelon  Generation  ComEd  PECO  BGE
Investments              
Equity method investments:              
 Financing trusts (a)$22 $0 $6 $8 $8
 Keystone Fuels, LLC 38  38  0  0  0
 Conemaugh Fuels, LLC 26  26  0  0  0
 CENG 1,849  1,849  0  0  0
 Safe Harbor 293  293  0  0  0
 Malacha 8  8  0  0  0
 Other investments 34  33  0  0  0
                 
 Total equity method investments 2,270  2,247  6  8  8
                 
Other investments:              
 Net investment in direct financing leases 685  0  0  0  0
 Employee benefit trusts and investments (b) 100  22  8  22  5
                 
Total investments$3,055 $2,269 $14 $30 $13

December 31, 2011Exelon  Generation  ComEd  PECO  BGE
Investments              
Equity method investments:              
 Financing trusts (a)$ 15 $0 $6 $8 $8
 Keystone Fuels, LLC 13  13  0  0  0
 Conemaugh Fuels, LLC 16  16  0  0  0
 Sacramento Solar 1  1  0  0  0
                 
 Total equity method investments 45  30  6  8  8
                 
Other investments:              
 Net investment in direct financing leases 656  0  0  0  0
 Employee benefit trusts and investments (b) 65  11  21  22  0
                 
Total investments$766 $41 $27 $30 $8

 

(a)       Includes investments in financing trusts, which were not consolidated within the financial statements of Exelon and are shown as investments in affiliates on the Consolidated Balance Sheets. See Note 1 - Significant Accounting Policies for additional information.

(b)       The Registrants' investments in these marketable securities are recorded at fair market value.

 

    
Capital Leases Net Investment In Direct Financing Leases Table
 December 31,
      
 2012 2011
      
Estimated residual value of leased assets$1,492 $1,492
Less: unearned income 807  836
      
Net investment in long-term leases$685 $656
    
Accrued Liabilities Current Table
December 31, 2012Exelon  Generation  ComEd  PECO  BGE
Accrued expenses              
Compensation-related accruals (a)$ 708 $ 371 $ 125 $ 45 $ 38
Taxes accrued  353   247   61   3   22
Interest accrued  236   60   96   32   41
Severance accrued  91   42   4   1   5
Other accrued expenses  412(b)  396(b)  9   1   -
                 
Total accrued expenses$1,800 $1,116 $295 $82 $106
                 
                 
     
                 
December 31, 2011Exelon  Generation  ComEd  PECO  BGE
Accrued expenses              
Compensation-related accruals (a)$ 520 $ 264 $ 127 $ 48 $ 42
Taxes accrued  297   241   59   5   26
Interest accrued  192   56   124   27   41
Severance accrued  15   9   2   1   -
Other accrued expenses  231(b)  209(b)  6   2   1
                 
Total accrued expenses$1,255 $779 $318 $83 $110
                 
                 
(a)Primarily includes accrued payroll, bonuses and other incentives, vacation and benefits.    
(b)Includes $327 million and $184 million for amounts accrued related to Antelope Valley as of December 31, 2012 and December 31, 2011, respectively.   
    
Accumulated Other Comprehensive Income Net Of Taxes
December 31, 2012Exelon  Generation  ComEd  PECO  BGE
Accumulated other comprehensive income (loss)              
Net unrealized gain on cash flow hedges$ 367 $ 513 $0 $0 $0
Pension and non-pension postretirement benefit plans (3,155)  (19)  0  0  0
Unrealized loss on marketable securities 21  19  0  1  0
                 
Total accumulated other comprehensive income (loss)$(2,767) $513 $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