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Segment Information (Tables)
 6 Months Ended
Jun. 30, 2013
Schedules Of Segment Reporting Information [Line Items]  
Analysis and reconciliation of reportable segment information

Three Months Ended June 30, 2013 and 2012

  Generation(a) ComEd PECO BGE  Other(b) Intersegment Eliminations Exelon
Total revenues(c):
 2013$4,070 $1,080 $672 $653 $297 $(631) $6,141
 2012 3,765  1,281  715  616  363  (774)  5,966
Intersegment revenues:
 2013$329 $0 $0 $4 $298 $(631) $0
 2012 408  1  1  2  362  (774)  0
Net income (loss):
 2013$328 $96 $78 $25 $(30) $0 $497
 2012 165  42  80  16  (14)  0  289
Total assets:
 June 30, 2013$39,678 $23,349 $9,407 $7,968 $9,763 $(11,745) $78,420
 December 31, 2012 40,681  22,905  9,353  7,506  10,432  (12,316)  78,561

__________

(a)       Generation includes the six power marketing reportable segments shown below: Mid-Atlantic, Midwest, New England, New York, ERCOT and Other Regions. Intersegment revenues for Generation for the three months ended June 30, 2013 include revenue from sales to PECO of $ 97 million and sales to BGE of $ 99 million in the Mid-Atlantic region, and sales to ComEd of $ 121 million in the Midwest region, net of $ 10 million related to the unrealized mark-to-market gains related to the ComEd swap, which eliminate upon consolidation. For the three months ended June 30, 2012 intersegment revenues for Generation include revenue from sales to PECO of $125 million and sales to BGE of $84 million in the Mid-Atlantic region, and sales to ComEd of $203 million in the Midwest region, net of $4 million related to the unrealized mark-to-market losses related to the ComEd swap, which eliminate upon consolidation.

(b)       Other primarily includes Exelon's corporate operations, shared service entities and other financing and investment activities.

(c)       For the three months ended June 30, 2013 and 2012, utility taxes of $18 million and $19 million, respectively, are included in revenues and expenses for Generation. For the three months ended June 30, 2013 and 2012, utility taxes of $56 million and $54 million, respectively, are included in revenues and expenses for ComEd. For the three months ended June 30, 2013 and 2012, utility taxes of $31 million and $34 million, respectively, are included in revenues and expenses for PECO. For the three months ended June 30, 2013 and 2012, utility taxes of $19 million and $19 million, respectively, are included in revenues and expenses for BGE.

 

Six Months Ended June 30, 2013 and 2012

                 Intersegment Eliminations   
  Generation (a) ComEd PECO BGE(b) Other(c)   Exelon
Total revenues(d):
 2013$7,603 $2,239 $1,567 $1,533 $615 $(1,334) $12,223
 2012 6,508  2,670  1,590  668  714  (1,494)  10,656
Intersegment revenues(e):
 2013$710 $1 $0 $8 $615 $(1,334) $0
 2012 774  1  2  3  715  (1,494)  1
Net income (loss):
 2013$310 $14 $200 $106 $(132) $0 $498
 2012 332  129  177  (49)  (99)  0  490

__________

(a)       Generation includes the six power marketing reportable segments shown below: Mid-Atlantic, Midwest, New England, New York, ERCOT and Other Regions. Intersegment revenues for Generation for the six months ended June 30, 2013 include revenue from sales to PECO of $ 238 million and sales to BGE of $ 212 million in the Mid-Atlantic region, and sales to ComEd of $ 266 million in the Midwest region, net of $ 7 million related to the unrealized mark-to-market losses related to the ComEd swap, which eliminate upon consolidation. For the six months ended June 30, 2012 intersegment revenues for Generation include revenue from sales to PECO of $235 million in the Mid-Atlantic region and sales to BGE of $103 million in the Mid-Atlantic region, and sales to ComEd of $451 million in the Midwest region, net of $15 million related to the unrealized mark-to-market losses related to the ComEd swap, which eliminate upon consolidation.

(b)       Amounts represent activity recorded at BGE from March 12, 2012, the closing date of the merger, through June 30, 2012.

(c)       Other primarily includes Exelon's corporate operations, shared service entities and other financing and investment activities.

(d)       For the six months ended June 30, 2013 and 2012, utility taxes of $ 39 million and $ 32 million, respectively, are included in revenues and expenses for Generation. For the six months ended June 30, 2013 and 2012, utility taxes of $117 million and $115 million, respectively, are included in revenues and expenses for ComEd. For the six months ended June 30, 2013 and 2012, utility taxes of $64 million and $68 million, respectively, are included in revenues and expenses for PECO. For the six months ended June 30, 2013 and period of March 12, 2012 through June 30, 2012, utility taxes of $41 million and $22 million, respectively, are included in revenues and expenses for BGE.

(e)       The intersegment profit associated with Generation's sale of AECs to PECO is not eliminated in consolidation due to the recognition of intersegment profit in accordance with regulatory accounting guidance. See Note 3 – Regulatory Matters of the Exelon 2012 Form 10-K for additional information on AECs. For Exelon, these amounts are included in operating revenues in the Consolidated Statements of Operations.

 
Exelon Generation Co L L C [Member]
  
Schedules Of Segment Reporting Information [Line Items]  
Analysis and reconciliation of reportable segment revenues for Generation

Three Months Ended June 30, 2013 and 2012

Generation total revenues (three months ended):
 2013 2012
 Revenues from external customers (a) Intersegment revenues  Total Revenues Revenues from external customers (a) Intersegment revenues Total Revenues
Mid-Atlantic$1,220 $9 $1,229 $1,433 $ (28) $1,405
Midwest 1,076  (5)  1,071  1,193   8  1,201
New England 209  (20)  189  296   32  328
New York 175  (1)  174  166   (22)  144
ERCOT 319  (4)  315  412   1  413
Other Regions (b) 246  (6)  240  219   25  244
Total Revenues for Reportable Segments$3,245 $(27) $3,218 $3,719 $16 $3,735
Other (c) 825  27  852  46   (16)  30
Total Generation Consolidated Operating Revenues$4,070 $0 $4,070 $3,765 $ - $3,765

 

(a)       Includes all electric sales to third parties and affiliated sales to ComEd, PECO and BGE.

(b)       Other regions include the South, West and Canada, which are not considered individually significant.

(c)       Other represents activities not allocated to a region. See text above for a description of included activities. Also includes amortization of intangible assets related to commodity contracts recorded at fair value of $234 million and $534 million, for the three months ended June 30, 2013 and 2012, respectively, and elimination of intersegment revenues.

 

Six Months Ended June 30, 2013 and 2012

Generation total revenues (six months ended):
 2013 2012
 Revenues from external customers (a) Intersegment revenues  Total Revenues Revenues from external customers (a) Intersegment revenues Total Revenues
Mid-Atlantic$2,551 $1 $2,552 $2,404 $(33) $2,371
Midwest 2,257  2  2,259  2,407  12  2,419
New England 600  (8)  592  386  35  421
New York 350  (7)  343  211  (24)  187
ERCOT 612  (4)  608  541  0  541
Other Regions (b) 429  36  465  294  29  323
Total Revenues for Reportable Segments$6,799 $20 $6,819 $6,243 $19 $6,262
Other (c) 804  (20)  784  265  (19)  246
Total Generation Consolidated Operating Revenues$7,603 $0 $7,603 $6,508 $0 $6,508

 

(a)        Includes all wholesale and retail electric sales from third parties and affiliated sales to ComEd, PECO and BGE.

(b)       Other regions include the South, West and Canada, which are not considered individually significant.

(c)       Other represents activities not allocated to a region. See text above for a description of included activities. Also includes amortization of intangible assets related to commodity contracts recorded at fair value at the merger date of $478 million and $686 million, for the six months ended June 30, 2013 and 2012, respectively, and elimination of intersegment revenues.

 
Analysis and reconciliation of reportable segment revenues net of purchased power and fuel expense for Generation

Three Months Ended June 30, 2013 and 2012

Generation total revenues net of purchased power and fuel expense (three months ended):
 2013 2012
 RNF from external customers (a) Intersegment RNF  Total RNF RNF from external customers (a) Intersegment RNF Total RNF
Mid-Atlantic$770 $(2) $768 $911 $ (28) $883
Midwest 687  (3)  684  756   8  764
New England 85  (35)  50  28   32  60
New York 0  14  14  61   (22)  39
ERCOT 143  (31)  112  118   1  119
Other Regions (b) 111  (52)  59  9   25  34
Total Revenues net of purchased power and fuel expense for Reportable Segments$1,796 $(109) $1,687 $1,883 $16 $1,899
Other (c) 328  109  437  30   (16)  14
Total Generation Revenues net of purchased power and fuel expense$2,124 $0 $2,124 $1,913 $ - $1,913

 

(a)       Includes purchases and sales from third parties and affiliated sales to ComEd, PECO and BGE.

(b)       Other regions includes the South, West and Canada, which are not considered individually significant.

(c)       Other represents activities not allocated to a region. See text above for a description of included activities. Also includes amortization of intangible assets related to commodity contracts recorded at fair value of $167 million and $414 million for the three months ended June 30, 2013 and 2012, respectively.

 

Six Months Ended June 30, 2013 and 2012

Generation total revenues net of purchased power and fuel expense (six months ended):
 2013 2012
 RNF from external customers (a) Intersegment RNF  Total RNF RNF from external customers (a) Intersegment RNF Total RNF
Mid-Atlantic$1,622 $(10) $1,612 $1,686 $(33) $1,653
Midwest 1,397  4  1,401  1,569  12  1,581
New England 103  (23)  80  64  35  99
New York (16)  8  (8)  71  (24)  47
ERCOT 255  (42)  213  153  0  153
Other Regions (b) 122  (17)  105  19  29  48
Total Revenues net of purchased power and fuel expense for Reportable Segments$3,483 $(80) $3,403 $3,562 $19 $3,581
Other (c) 6  80  86  50  (19)  31
Total Generation Revenues net of purchased power and fuel expense$3,489 $0 $3,489 $3,612 $0 $3,612

 

(a)       Includes purchases and sales from third parties and affiliated sales to ComEd, PECO and BGE.

(b)       Other regions includes the South, West and Canada, which are not considered individually significant.

(c)       Other represents activities not allocated to a region. See text above for a description of included activities. Also includes amortization of intangible assets related to commodity contracts recorded at fair value at the merger date of $341 million and $537 million, for the six months ended June 30, 2013 and 2012, respectively.