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Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]  
Schedule Of Goodwill
Exelon’s, Generation's, ComEd’s, PHI's and DPL's gross amount of goodwill, accumulated impairment losses and carrying amount of goodwill for the years ended December 31, 2017 and 2016 were as follows:
 
Balance at January 1, 2016
 
Goodwill from business combination
 
Impairment losses
 
Measurement period adjustments (b)
 
Balance at December 31, 2016
 
Impairment losses
 
Balance at December 31, 2017
Exelon
 
 
 
 
 
 
 
 
 
 
 
 
 
Gross amount
$
4,655

 
$
4,016

 
$
—

 
$
(11
)
 
$
8,660

 
$
—

 
$
8,660

Accumulated impairment loss
1,983

 
—

 
—

 
—

 
1,983

 
—

 
1,983

Carrying amount
2,672

 
4,016

 
—

 
(11
)
 
6,677

 
—

 
6,677

Generation
 
 
 
 
 
 
 
 
 
 
 
 

Gross amount
47

 
—

 
—

 
—

 
47

 
—

 
47

Carrying amount
47

 
—

 
—

 
—

 
47

 
—

 
47

ComEd(a)
 
 
 
 
 
 
 
 
 
 
 
 

Gross amount
4,608

 
—

 
—

 
—

 
4,608

 
—

 
4,608

Accumulated impairment loss
1,983

 
—

 
—

 
—

 
1,983

 
—

 
1,983

Carrying amount
2,625

 
—

 
—

 
—

 
2,625

 
—

 
2,625

DPL
 
 
 
 
 
 
 
 
 
 
 
 

Gross amount
8

 
—

 
—

 
—

 
8

 
—

 
8

Carrying amount
8

 
—

 
—

 
—

 
8

 
—

 
8


For the Year Ended December 31, 2017
Beginning Balance
 
Goodwill from business combination
 
Impairment losses
 
Measurement period adjustments (b)
 
Ending Balance
PHI - Successor
 
 
 
 
 
 
 
 
 
Gross amount
$
4,005

 
$
—

 
$
—

 
$
—

 
$
4,005

Accumulated impairment loss
—

 
—

 
—

 
—

 
—

Carrying Amount
4,005

 
—

 
—

 
—

 
4,005

 
 
 
 
 
 
 
 
 
 
March 24, 2016 to December 31, 2016

 
 
 
 
 
 
 
 
 
PHI - Successor
 
 
 
 
 
 
 
 
 
Gross amount
—

 
4,016

 
—

 
(11
)
 
4,005

Accumulated impairment loss
—

 
—

 
—

 
—

 
—

Carrying amount
—

 
4,016

 
—

 
(11
)
 
4,005

 
 
 
 
 
 
 
 
 
 
January 1, 2016 to March 23, 2016
 
 
 
 
 
 
 
 
 
PHI - Predecessor
 
 
 
 
 
 
 
 
 
Gross amount
1,418

 
—

 
—

 
—

 
1,418

Accumulated impairment loss
12

 
—

 
—

 
—

 
12

Carrying amount
1,406

 
—

 
—

 
—

 
1,406

__________
(a)
Reflects goodwill recorded in 2000 from the PECO/Unicom (predecessor parent company of ComEd) merger net of amortization, resolution of tax matters and other non-impairment-related changes as allowed under previous authoritative guidance.
(b)
Represents various measurement period adjustments to the valuation of the fair value of the PHI assets acquired and liabilities assumed as a result of the merger.
Schedule of Finite-Lived Intangible Assets
Exelon’s, Generation’s, ComEd’s and PHI's other intangible assets and liabilities, included in Unamortized energy contract assets and liabilities and Other deferred debits and other assets in their Consolidated Balance Sheets, consisted of the following as of December 31, 2017 and 2016:
 
 
December 31, 2017
 
December 31, 2016
 
 
Gross
 
Accumulated Amortization
 
Net
 
Gross
 
Accumulated Amortization
 
Net
Exelon
 
 
 
 
 
 
 
 
 
 
 
 
Software License(a)
 
$
95

 
$
(25
)
 
$
70

 
$
95

 
$
(15
)
 
$
80

Generation
 
 
 
 
 

 
 
 
 
 

Unamortized Energy Contracts(b)
 
1,938

 
(1,574
)
 
364

 
1,926

 
(1,543
)
 
383

Customer Relationships
 
305

 
(133
)
 
172

 
299

 
(109
)
 
190

Trade Name
 
243

 
(148
)
 
95

 
243

 
(125
)
 
118

Service Contract Backlog
 
—

 
—

 
—

 
9

 
(7
)
 
2

ComEd
 
 
 
 
 

 
 
 
 
 

Chicago Settlement Agreements(c)
 
162

 
(141
)
 
21

 
162

 
(133
)
 
29

PHI
 
 
 
 
 

 
 
 
 
 

Unamortized Energy Contracts(b)
 
(1,515
)
 
766

 
(749
)
 
(1,515
)
 
430

 
(1,085
)
Pepco
 
 
 
 
 

 
 
 
 
 

DC Sponsorship Agreement(d)
 
—

 
—

 
—

 
25

 
—

 
25

Total
 
$
1,228

 
$
(1,255
)
 
$
(27
)
 
$
1,244

 
$
(1,502
)
 
$
(258
)
__________
(a)
On May 31, 2015, Exelon entered into a long-term software license agreement.  Exelon is required to make payments starting August 2015 through May 2024.  The intangible asset recognized as a result of these payments is being amortized on a straight-line basis over the contract term.
(b)
Includes unamortized energy contract assets and liabilities on Exelon's, Generations and PHI's Consolidated Balance Sheets.
(c)
In March 1999 and February 2003, ComEd entered into separate agreements with the City of Chicago and Midwest Generation, LLC. Under the terms of the settlement, ComEd agreed to make payments to the City of Chicago. The intangible asset recognized as a result of the settlement agreement is being amortized ratably over the remaining term of the City of Chicago franchise agreement.
(d)
PHI entered into a sponsorship agreement with the District of Columbia for future sponsorship rights associated with public property within the District of Columbia. In December 2017, the asset was written off. See Note 7 - Impairment of Long-Lived Assets and Intangibles for additional information.
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
The following table summarizes the estimated future amortization expense related to intangible assets and liabilities as of December 31, 2017:
For the Years Ending December 31,
 
Exelon
 
Generation
 
ComEd
 
PHI
2018
 
$
10

 
$
62

 
$
7

 
$
(189
)
2019
 
10

 
57

 
7

 
(119
)
2020
 
10

 
68

 
7

 
(115
)
2021
 
10

 
77

 
—

 
(92
)
2022
 
10

 
54

 
—

 
(89
)
Schedule Of Finite-Lived Intangible Assets Amortization Expense
The following table summarizes the amortization expense related to intangible assets and liabilities for each of the years ended December 31, 2017, 2016 and 2015:
For the Years Ended December 31,
Exelon (a)
 
Generation (a)
 
ComEd
2017
$
92

 
$
83

 
$
7

2016
87

 
79

 
7

2015
76

 
69

 
7

__________
(a) At Exelon, amortization of unamortized energy contracts totaling $35 million, $35 million and $22 million for the years ended December 31, 2017, 2016 and 2015, respectively, was recorded in Operating revenues or Purchased power and fuel expense within Exelon’s Consolidated Statements of Operations and Comprehensive Income. At Generation, amortization of unamortized energy contracts totaling $35 million, $35 million and $22 million for the years ended December 31, 2017, 2016 and 2015, respectively, was recorded in Operating revenues or Purchased power and fuel expense within Generation’s Consolidated Statements of Operations and Comprehensive Inco
Schedule of Alternative or Renewable Energy Credits [Table Text Block]
The following table summarizes the current and noncurrent Renewable and Alternative Energy Credits for the years ended December 31, 2017 and 2016:
 
As of December 31, 2017
 
 
 
 
 
 
 
Successor
 
 
 
 
 
Exelon
 
Generation
 
PECO
 
PHI
 
DPL
 
ACE
Current AEC's
$
1

 
$
—

 
$
1

 
$
—

 
$
—

 
$
—

Noncurrent AEC's
—

 
—

 
—

 
—

 
—

 
—

Current REC's
321

 
312

 
—

 
9

 
8

 
1

Noncurrent REC's
27

 
27

 
—

 
—

 
—

 
—

 
As of December 31, 2016
 
 
 
 
 
 
 
Successor
 
 
 
 
 
Exelon
 
Generation
 
PECO
 
PHI
 
DPL
 
ACE
Current AEC's
$
1

 
$
—

 
$
1

 
$
—

 
$
—

 
$
—

Noncurrent AEC's
—

 
—

 
—

 
—

 
—

 
—

Current REC's
330

 
318

 
—

 
12

 
11

 
1

Noncurrent REC's
29

 
29

 
—

 
—

 
—

 
—