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Supplemental Financial Information (Tables)
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Supplemental Financial Information Tables [Line Items]    
Components of non-operating income and expenses
Three Months Ended June 30, 2013Exelon Generation ComEd PECO BGE 
Other, Net               
Decommissioning-related activities:               
 Net realized income on decommissioning trust funds (a)               
  Regulatory Agreement Units$47 $47 $0 $0 $0 
  Non-Regulatory Agreement Units 16  16  0  0  0 
 Net unrealized losses on decommissioning trust funds               
  Regulatory Agreement Units (102)  (102)  0  0  0 
  Non-Regulatory Agreement Units (40)  (40)  0  0  0 
 Net unrealized gains on pledged assets                
  Zion Station decommissioning 2  2  0  0  0 
 Regulatory offset to decommissioning trust fund-related               
  activities(b)  40  40  0  0  0 
Total decommissioning-related activities (37)  (37)  0  0  0 
Investment income 2  0  0  (1)  2(c)
Long-term lease income  5  0  0  0  0 
Interest income (expense) related to uncertain income tax positions (1)  (2)  0  0  0 
AFUDC - Equity 5  0  3  1  2 
Other  9  6  3  0  0 
                  
Other, net $(17) $(33) $6 $0 $4 
                
                  
Six Months Ended June 30, 2013Exelon Generation ComEd PECO BGE 
Other, Net               
Decommissioning-related activities:               
 Net realized income on decommissioning trust funds (a)               
  Regulatory Agreement Units$84 $84 $0 $0 $0 
  Non-Regulatory Agreement Units 30  30  0  0  0 
 Net unrealized gains on decommissioning trust funds               
  Regulatory Agreement Units 92  92  0  0  0 
  Non-Regulatory Agreement Units 24  24  0  0  0 
 Net unrealized gains on pledged assets                
  Zion Station decommissioning 3  3  0  0  0 
 Regulatory offset to decommissioning trust fund-related               
  activities(b)  (148)  (148)  0  0  0 
Total decommissioning-related activities 85  85  0  0  0 
Investment income (expense) 5  (1)  0  (1)  5(c)
Long-term lease income  13  0  0  0  0 
Interest income related to uncertain income tax positions 24  3  0  0  0 
AFUDC - Equity 12  0  6  2  4 
Other  16  8  5  2  0 
                  
Other, net $155 $95 $11 $3 $9 
                  

Three Months Ended June 30, 2012Exelon Generation ComEd PECO BGE
Other, Net              
Decommissioning-related activities:              
 Net realized income on decommissioning trust funds (a)              
  Regulatory Agreement Units$50 $50 $0 $0 $0
  Non-Regulatory Agreement Units 19  19  0  0  0
 Net unrealized losses on decommissioning trust funds               
  Regulatory Agreement Units (97)  (97)  0  0  0
  Non-Regulatory Agreement Units (35)  (35)  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)  31  31  0  0  0
Total decommissioning-related activities (28)  (28)  0  0  0
Investment income 6  1  0  1  3
Long-term lease income  7  0  0  0  0
Interest income related to uncertain income tax positions 14  0  1  0  0
Credit facility termination fees (42)  (42)  0  0  0
AFUDC - Equity 3  0  0  1  3
Other  (3)  (7)  2  0  1
                 
Other, net $(43) $(76) $3 $2 $7
               
Six Months Ended June 30, 2012Exelon Generation ComEd PECO BGE
Other, Net              
Decommissioning-related activities:              
 Net realized income on decommissioning trust funds (a)              
  Regulatory Agreement Units$110 $110 $0 $0 $0
  Non-Regulatory Agreement Units 67  67  0  0  0
 Net unrealized losses on decommissioning trust funds               
  Regulatory Agreement Units 150  150  0  0  0
  Non-Regulatory Agreement Units 30  30  0  0  0
 Net unrealized income on pledged assets              
  Zion Station decommissioning 38  38  0  0  0
 Regulatory offset to decommissioning trust fund-related              
  activities(b)  (245)  (245)  0  0  0
Total decommissioning-related activities 150  150  0  0  0
Investment income 10  0  0  2  6
Long-term lease income  15  0  0  0  0
Interest income related to uncertain income tax positions 14  0  1  0  0
Credit facility termination fees (42)  (42)  0  0  0
AFUDC - Equity 7  0  1  2  6
Other  (2)  (5)  5  1  1
                 
Other, net $152 $103 $7 $5 $13
                 

__________

(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 income taxes related to all NDT fund activity for those units. See Note 13 – Asset Retirement Obligations of the Exelon 2012 Form 10-K for additional information regarding the accounting for nuclear decommissioning.

(c)       Relates to the cash return on BGE's rate stabilization deferral. See Note 5 - Regulatory Matters for additional information regarding the rate stabilization deferral.

 

__________

(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 income taxes related to all NDT fund activity for those units. See Note 13 – Asset Retirement Obligations of the Exelon 2012 Form 10-K for additional information regarding the accounting for nuclear decommissioning.

(c)       Relates to the cash return on BGE's rate stabilization deferral. See Note 5 - Regulatory Matters for additional information regarding the rate stabilization deferral.

 
Components of depreciation, amortization and accretion, and other, net
                 
Six Months Ended June 30, 2013Exelon Generation ComEd PECO BGE
Depreciation, amortization, accretion and depletion              
Property, plant and equipment$ 942 $402 $275 $109 $128
Regulatory assets  112  0  62  4  47
Amortization of intangible assets, net  22  22  0  0  0
Amortization of energy contract assets and liabilities (a)  306  344  0  0  0
Nuclear fuel (a)  454  454  0  0  0
ARO accretion (b)  136  136  0  0  0
                 
Total depreciation, amortization, accretion and depletion$ 1,972 $ 1,358 $ 337 $ 113 $175
                 
Six Months Ended June 30, 2012Exelon Generation ComEd PECO BGE
Depreciation, amortization, accretion and depletion              
Property, plant and equipment$806 $343 $262 $102 $123
Regulatory assets 56  0  38  5  27
Amortization of intangible assets, net 14  14  0  0  0
Amortization of energy contract assets and liabilities (a) 485  532  0  0  0
Nuclear fuel (a) 419  419  0  0  0
ARO accretion (b) 115  115  0  0  0
                 
Total depreciation, amortization, accretion and depletion$ 1,895 $ 1,423 $ 300 $ 107 $ 150

__________

(a)       Included in revenues or 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.

 

  
Cash Flow Supplemental Disclosures
Six Months Ended June 30, 2013Exelon Generation ComEd PECO BGE
Other non-cash operating activities:              
Pension and non-pension postretirement benefit costs$409 $173 $154 $21 $27
Loss in equity method investments 30  30  0  0  0
Provision for uncollectible accounts 55  10  4  27  14
Stock-based compensation costs 70  0  0  0  0
Other decommissioning-related activity (a) (62)  (62)  0  0  0
Energy-related options (b) 65  65  0  0  0
Amortization of regulatory asset related to debt costs 6  0  5  1  0
Amortization of rate stabilization deferral 29  0  0  0  29
Amortization of debt fair value adjustment (22)  (22)  0  0  0
Discrete impacts from EIMA (c)(126)  0  (126)  0  0
Amortization of debt costs 8  5  2  1  0
Merger integration costs (d) (6)  0  0  0  (6)
Impairment of investments in direct financing leases (e) 14  0  0  0  0
Increase in inventory reserve 13  13  0  0  0
Impairment charges (f) 110  110  0  0  0
Other (17)  (7)  0  0  (3)
               
Total other non-cash operating activities$576 $315 $39 $50 $61
                
Changes in other assets and liabilities:              
Under/over-recovered energy and transmission costs$(24) $0 $(61) $19 $18
Other regulatory assets and liabilities 3  0  (28)  (5)  (82)
Other current assets (123)  (134)  2  (62)  99
Other noncurrent assets and liabilities 277  (34)  259(g) (1)  28
                
Total changes in other assets and liabilities$133 $(168) $172 $(49) $63
                
Non-cash investing and financing activities:              
Consolidated VIE dividend to non-controlling interest$63 $63 $0 $0 $0
Indemnification of like-kind exchange position (h) 0  0  174  0  0
                
 Total non-cash investing and financing activities:$63 $63 $174 $0 $0

Six Months Ended June 30, 2012Exelon Generation ComEd PECO BGE
Other non-cash operating activities:              
Pension and non-pension postretirement benefit costs$400 $175 $137 $26 $32
Provision for uncollectible accounts 60  (1)  21  26  17
Stock-based compensation costs 56  0  0  0  0
Other decommissioning-related activity (a) (62)  (62)  0  0  0
Energy-related options (b) 64  64  0  0  0
Amortization of regulatory asset related to debt costs 9  0  7  1  1
Amortization of rate stabilization deferral 15  0  0  0  25
Amortization of debt fair value adjustment (26)  (11)  0  0  0
Discrete impacts from EIMA (c)  69  0  69  0  0
Amortization of debt costs 0  0  2  0  0
Merger-related commitments (i) 188  35  0  0  28
Severance cost 119  30  0  7  0
Loss in equity method investments 79  79  0  0  0
Other (12)  9  5  6  (3)
               
Total other non-cash operating activities$959 $318 $241 $66 $100
               
Changes in other assets and liabilities:              
Under/over-recovered energy and transmission costs$(37) $0 $(58) $18 $2
Other regulatory assets and liabilities (514)  0  (39)  12  (28)
Other current assets  190  (97)  (1)  (110) 55
Other noncurrent assets and liabilities (12)  (77)  (6)  (7)  14
               
Total changes in other assets and liabilities$(373) $(174) $(104) $(87) $43
               
Non-cash investing and financing activities:             
Merger with Constellation, common stock issued$7,365 $5,272 $0 $0 $0
               
Total non-cash investing and financing activities:$7,365 $5,272 $0 $0 $0

_________

(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 13 of the Exelon 2012 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) Reflects the change in distribution rates pursuant to EIMA, which allows for the recovery of costs by a utility through a pre-established performance-based formula rate tariff. See Note 5 - Regulatory Matters for more information.

(d)       Relates to integration costs to achieve distribution synergies related to the merger transaction. See Note 5 - Regulatory Matters for more information.

(e)       Relates to an other than temporary decline in the estimated residual value of one of Exelon's direct financing leases. See Note 7 – Impairment of Long-Lived Assets for more information.

(f)              Relates to the cancellation of uprate projects at Generation. See Note 7 – Impairment of Long-Lived Assets for additional information.

(g)       Relates primarily to interest payable related to like-kind exchange tax position. See Note 12 – Income Taxes for discussion of the like-kind exchange tax position.

(h)       See Note 12 – Income Taxes for discussion of the like-kind exchange tax position.

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

 

  
Supplemental Balance Sheet Disclosures
June 30, 2013Exelon   Generation   ComEd  PECO  BGE
Property, plant and equipment:                
Accumulated depreciation and amortization$ 12,905(a) $6,521(a) $3,035 $2,874 $2,656
Accounts receivable:                
Allowance for uncollectible accounts 306   85   68  115  38
                 
December 31, 2012Exelon   Generation   ComEd  PECO  BGE
Property, plant and equipment:                
Accumulated depreciation and amortization$ 12,184(b) $6,014(b) $2,998 $2,797 $2,595
Accounts receivable:                
Allowance for uncollectible accounts 293   84   70  99  40

___________

(a)       Includes accumulated amortization of nuclear fuel in the reactor core of $2,220 million.

(b)       Includes accumulated amortization of nuclear fuel in the reactor core of $2,078 million.