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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2014
Accounting Policies [Abstract]  
Schedule Of Capitalized Software
The following table presents net unamortized capitalized software costs and amortization of capitalized software costs by year:
 
Net unamortized software costs
Exelon (a)
 
Generation (a)
 
ComEd
 
PECO
 
BGE
December 31, 2014
$
596

 
$
193

 
$
133

 
$
84

 
$
163

December 31, 2013
479

 
129

 
101

 
71

 
155

 
 
 
 
 
 
 
 
 
 
Amortization of capitalized software costs
Exelon (a) (b)
 
Generation (a) (b)
 
ComEd
 
PECO
 
BGE (b)
2014
$
186

 
$
59

 
$
45

 
$
28

 
$
43

2013
198

 
67

 
52

 
33

 
36

2012
208

 
81

 
56

 
30

 
32

_______________________
(a)
On April 1, 2014, Generation assumed operational control of CENG’s nuclear fleet. As a result, the 2014 financial results include CENG’s financial position and results of operations beginning April 1, 2014.
(b)
Exelon activity for the year ended December 31, 2012 includes the results of Constellation and BGE for March 12, 2012—December 31, 2012. Generation activity for the year ended December 31, 2012 includes the results of Constellation for March 12, 2012—December 31, 2012. BGE activity represents the activity for the year ended December 31, 2012.
Schedule Of Capitalized Interest And AFUDC
The following table summarizes total incurred interest, capitalized interest and credits to AFUDC by year:
 
 
 
Exelon(a)(b)
 
Generation(a)(b)
 
ComEd
 
PECO
 
BGE (b)
2014
Total incurred interest (c)
$
1,144

 
$
419

 
$
323

 
$
115

 
$
118

 
Capitalized interest
63

 
63

 
—

 
—

 
—

 
Credits to AFUDC debt and equity
37

 
—

 
5

 
8

 
24

2013
Total incurred interest (c)
$
1,423

 
$
411

 
$
584

 
$
117

 
$
129

 
Capitalized interest
54

 
54

 
—

 
—

 
—

 
Credits to AFUDC debt and equity
35

 
—

 
16

 
6

 
13

2012
Total incurred interest (c)
$
1,003

 
$
368

 
$
310

 
$
125

 
$
149

 
Capitalized interest
67

 
67

 
—

 
—

 
—

 
Credits to AFUDC debt and equity
25

 
—

 
9

 
6

 
15

_______________________
(a)
On April 1, 2014, Generation assumed operational control of CENG’s nuclear fleet. As a result, the 2014 financial results include CENG’s financial position and results of operations beginning April 1, 2014.
(b)
Exelon activity for the year ended December 31, 2012 includes the results of Constellation and BGE for March 12, 2012—December 31, 2012. Generation activity for the year ended December 31, 2012 includes the results of Constellation for March 12, 2012—December 31, 2012. BGE activity represents the activity for the year ended December 31, 2012.
(c)
Includes interest expense to affiliates.