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Supplemental Financial Information (Tables)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Supplemental Financial Information Tables [Line Items]    
Components of non-operating income and expenses
                  
Three Months Ended March 31, 2014Exelon Generation ComEd PECO BGE 
Other, Net               
Decommissioning-related activities:               
 Net realized income on decommissioning trust funds (a)               
  Regulatory agreement units$43 $43 $0 $0 $0 
  Non-regulatory agreement units 25  25  0  0  0 
 Net unrealized gains on decommissioning trust funds               
  Regulatory agreement units  61  61  0  0  0 
  Non-regulatory agreement units 13  13  0  0  0 
 Net unrealized gains on pledged assets               
  Zion Station decommissioning 10  10  0  0  0 
 Regulatory offset to decommissioning trust fund-related               
  activities (b) (94)  (94)  0  0  0 
Total decommissioning-related activities 58  58  0  0  0 
Investment income (expense) 1  1  0  0  2(c)
Long-term lease income  6  0  0  0  0 
Interest income related to uncertain income tax positions 10  14  0  0  0 
AFUDC - Equity 6  0  3  1  3 
Other  22  17  2  1  (1) 
                  
Other, net $103 $90 $5 $2 $4 
                

Three Months Ended March 31, 2013Exelon Generation ComEd PECO BGE 
Other, Net               
Decommissioning-related activities:               
 Net realized income on decommissioning trust funds (a)                
  Regulatory agreement units$36 $36 $0 $0 $0 
  Non-regulatory agreement units 14  14  0  0  0 
 Net unrealized gains on decommissioning trust funds                
  Regulatory agreement units 195  195  0  0  0 
  Non-regulatory agreement units 64  64  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) (190)  (190)  0  0  0 
Total decommissioning-related activities 121  121  0  0  0 
Investment income (expense) 3  (2)  0  0  2(c)
Long-term lease income 8  0  0  0  0 
Interest income related to uncertain income tax provisions 25  5  0  0  0 
AFUDC - Equity 6  0  3  1  2 
Other  9  4  2  2  1 
                  
Other, net $172 $128 $5 $3 $5 

__________

(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 15 – Asset Retirement Obligations of the Exelon 2013 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 4 - 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 activity for the Regulatory Agreement Units, including the elimination of net income taxes related to all NDT fund activity for those units. See Note 15 – Asset Retirement Obligations of the Exelon 2013 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 4 - Regulatory Matters for additional information regarding the rate stabilization deferral.

 
Components of depreciation, amortization and accretion, and other, net
Three Months Ended March 31, 2014Exelon Generation ComEd PECO BGE
Depreciation, amortization, accretion and depletion              
Property, plant and equipment$481 $200 $143 $56 $70
Regulatory assets 72  0  30  2   38
Amortization of intangible assets, net 11  11  0  0  0
Amortization of energy contract assets and liabilities (a) 42  44  0  0  0
Nuclear fuel (b) 234  234  0  0  0
ARO accretion (c) 68  68  0  0  0
                
Total depreciation, amortization, accretion and depletion$908 $557 $173 $58 $108
                
Three Months Ended March 31, 2013Exelon Generation ComEd PECO BGE
Depreciation, amortization, accretion and depletion              
Property, plant and equipment$471 $203 $137 $55 $64
Regulatory assets 61  0  30  2  29
Amortization of intangible assets, net 11  11  0  0  0
Amortization of energy contract assets and liabilities (a) 176  176  0  0  0
Nuclear fuel (b) 230  230  0  0  0
ARO accretion (c) 68  68  0  0  0
                
Total depreciation, amortization, accretion and depletion$1,017 $688 $167 $57 $93

__________

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

(b)       Included in Purchased power and fuel expense on the Registrants' Consolidated Statements of Operations and Comprehensive Income.

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

 

  
Cash Flow Supplemental Disclosures
Three Months Ended March 31, 2014Exelon Generation ComEd PECO BGE
Other non-cash operating activities:              
Pension and non-pension postretirement benefit costs$173 $75 $56 $12 $16
Loss from equity method investments 19  19  0  0  0
Provision for uncollectible accounts 35  1  (11)  35  11
Stock-based compensation costs 46  0  0  0  0
Other decommissioning-related activity (a) (35)  (35)  0  0  0
Energy-related options (b) 31  31  0  0  0
Amortization of regulatory asset related to debt costs 3  0  2  1  0
Amortization of rate stabilization deferral 20  0  0  0  20
Amortization of debt fair value adjustment (12)  (5)  0  0  0
Discrete impacts of EIMA (c) (4)  0  (4)  0  0
Amortization of debt costs 5  3  (5)  1  0
Increase in inventory reserve 2  2  0  0  0
Other (11)  (6)  (2)  0  (4)
               
Total other non-cash operating activities$272 $85 $36 $49 $43
                
Changes in other assets and liabilities:              
Under/over-recovered energy and transmission costs$(15) $0 $4 $(17) $23
Other regulatory assets and liabilities (4)  0  (10)  (3)  6
Other current assets (209)  (80)  (29)  (105)(e) 18
Other noncurrent assets and liabilities (50)  (23)  11  (2)  (3)
                
Total changes in other assets and liabilities$(278) $(103) $(24) $(127) $44
                
Non-cash investing and financing activities:              
Indemnification of like-kind exchange position (f)$0 $0 $2 $0 $0
                
 Total non-cash investing and financing activities:$0 $0 $2 $0 $0

Three Months Ended March 31, 2013Exelon Generation ComEd PECO BGE
Other non-cash operating activities:              
Pension and non-pension postretirement benefit costs$205 $87 $77 $11 $14
Loss in equity method investments 9  9  0  0  0
Provision for uncollectible accounts 45  7  9  25  4
Stock-based compensation costs 39  4  1  1  1
Other decommissioning-related activity (a) (64)  (64)  0  0  0
Energy-related options (b) 21  21  0  0  0
Amortization of regulatory asset related to debt costs 4  0  3  1  0
Amortization of rate stabilization deferral 30  0  0  0  30
Amortization of debt fair value adjustment (9)  (9)  0  0  0
Discrete impacts from EIMA (c)  (49)  0  (49)  0  0
Amortization of debt costs 5  3  1  1  0
Merger integration costs (d) (6)  0  0  0  (6)
Other 1  8  0  0  (1)
               
Total other non-cash operating activities$231 $66 $42 $39 $42
               
Changes in other assets and liabilities:              
Under/over-recovered energy and transmission costs$29 $0 $(18) $22 $16
Other regulatory assets and liabilities 91  0  (14)  13  (53)
Other current assets  (169)  (131)  17  (75)(e)73
Other noncurrent assets and liabilities 282  (28)  263  2  (2)
               
Total changes in other assets and liabilities$233 $(159) $248 $(38) $34
               
Non-cash investing and financing activities:             
Consolidated VIE dividend to non-controlling interest$63  63  0  0  0
Indemnification of like-kind exchange position (f) 0  0  172  0  0
               
Total non-cash investing and financing activities$63 $63 $172 $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 15 of the Exelon 2013 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 4 - Regulatory Matters for more information.

(d)       Relates to integration costs to achieve distribution synergies related to the merger transaction. See Note 4 - Regulatory Matters for more information.

(e)       Relates primarily to prepaid utility taxes.

(f)              See Note 9 – Income Taxes for discussion of the like-kind exchange tax position.

 

 

  
Supplemental Balance Sheet Disclosures
March 31, 2014Exelon   Generation   ComEd  PECO  BGE
Property, plant and equipment:                
Accumulated depreciation and amortization$ 14,066(a) $7,245(a) $3,247 $2,958 $2,741
Accounts receivable:                
Allowance for uncollectible accounts 306   46   76  140  44
                 
December 31, 2013Exelon   Generation   ComEd  PECO  BGE
Property, plant and equipment:                
Accumulated depreciation and amortization$ 13,713(b) $7,034(b) $3,184 $2,935 $2,702
Accounts receivable:                
Allowance for uncollectible accounts 272   57   62  107  46

___________

(a)       Includes accumulated amortization of nuclear fuel in the reactor core of $2,425 million.

(b)       Includes accumulated amortization of nuclear fuel in the reactor core of $2,371 million.

 

  
Capital Leases Net Investment In Direct Financing Leases Table
 March 31, 2014 December 31, 2013
Estimated residual value of leased assets$ 731 $ 1,465
Less: unearned income  363   767
Net investment in long-term leases$ 368 $ 698
  
Accumulated Other Comprehensive Income Net Of Taxes
 For the Three Months Ended March 31, 2014 Gains and (Losses) on Cash Flow Hedges Unrealized Gains and (Losses) on Marketable Securities Pension and Non-Pension Postretirement Benefit Plan items Foreign Currency Items AOCI of Equity Investments Total
Exelon (a)            
 Beginning balance$120$2$(2,260)$(10)$108$(2,040)
 OCI before reclassifications (1) 0 (13) (5) 11 (8)
 Amounts reclassified from AOCI (b) (24) 0 35 0 1 12
 Net current-period OCI (25) 0 22 (5) 12 4
 Ending balance$95$2$(2,238)$(15)$120$(2,036)
              
Generation (a)            
 Beginning balance$114$2$0$(10)$108$214
 OCI before reclassifications (1) (3) 0 (5) 11 2
 Amounts reclassified from AOCI (b) (24) 0 0 0 1 (23)
 Net current-period OCI (25) (3) 0 (5) 12 (21)
 Ending balance$89$(1)$0$(15)$120$193
              
ComEd (a)            
              
PECO (a)            
 Beginning balance$0$1$0$0$0$1
 OCI before reclassifications 0 0 0 0 0 0
 Amounts reclassified from AOCI (b) 0 0 0 0 0 0
 Net current-period OCI 0 0 0 0 0 0
 Ending balance$0$1$0$0$0$1
              
BGE (a)            

(a) All amounts are net of tax. Amounts in parenthesis represent a decrease in accumulated other comprehensive income.

(b) See tables following changes in accumulated other comprehensive income tables for details about these reclassifications.

 For the Three Months Ended March 31, 2013 Gains and (Losses) on Cash Flow Hedges Unrealized Gains and (Losses) on Marketable Securities Pension and Non-Pension Postretirement Benefit Plan items Foreign Currency Items AOCI of Equity Investments Total
Exelon (a)            
 Beginning balance$368$0$(3,137)$0$2$(2,767)
 OCI before reclassifications 0 (1) 76 (1) 26 100
 Amounts reclassified from AOCI (b) (58) 0 50 0 2 (6)
 Net current-period OCI (58) (1) 126 (1) 28 94
 Ending balance$310$(1)$(3,011)$(1)$30$(2,673)
              
Generation (a)            
 Beginning balance$513$(1)$(19)$0$20$513
 OCI before reclassifications 5 (1) 0 (1) 26 29
 Amounts reclassified from AOCI (b) (135) 0 0 0 2 (133)
 Net current-period OCI (130) (1) 0 (1) 28 (104)
 Ending balance$383$(2)$(19)$(1)$48$409
              
ComEd (a)            
              
PECO (a)            
 Beginning balance$0$1$0$0$0$1
 OCI before reclassifications 0 0 0 0 0 0
 Amounts reclassified from AOCI (b) 0 0 0 0 0 0
 Net current-period OCI 0 0 0 0 0 0
 Ending balance$0$1$0$0$0$1
              
BGE (a)