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Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]  
Schedule Of Goodwill
Exelon’s, ComEd’s and PHI's gross amount of goodwill, accumulated impairment losses and carrying amount of goodwill for the years ended December 31, 2018 and 2017 were as follows:
 
Balance at January 1, 2017
 
Impairment losses
 
Balance at December 31, 2017
 
Impairment losses
 
Balance at December 31, 2018
Exelon
 
 
 
 
 
 
 
 
 
Gross amount
$
8,660

 
$
—

 
$
8,660

 
$
—

 
$
8,660

Accumulated impairment loss
1,983

 
—

 
1,983

 
—

 
1,983

Carrying amount
6,677

 
—

 
6,677

 
—

 
6,677

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

PHI(b)
 
 
 
 
 
 
 
 
 
Gross amount
4,005

 
—

 
4,005

 
—

 
4,005

Carrying amount
4,005

 
—

 
4,005

 
—

 
4,005


__________
(a)
Reflects goodwill recorded in 2000 from the PECO/Unicom merger (predecessor parent company of ComEd).
 [1],[2]
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, 2018 and 2017:
 
 
December 31, 2018
 
December 31, 2017
 
 
Gross
 
Accumulated Amortization
 
Net
 
Gross
 
Accumulated Amortization
 
Net
Generation
 
 
 
 
 

 
 
 
 
 

Unamortized Energy Contracts(b)
 
1,957

 
(1,588
)
 
369

 
1,938

 
(1,574
)
 
364

Customer Relationships
 
325

 
(162
)
 
163

 
305

 
(133
)
 
172

Trade Name
 
243

 
(171
)
 
72

 
243

 
(148
)
 
95

ComEd
 
 
 
 
 

 
 
 
 
 

Chicago Settlement Agreements(c)
 
162

 
(148
)
 
14

 
162

 
(141
)
 
21

PHI
 
 
 
 
 

 
 
 
 
 

Unamortized Energy Contracts(b)
 
(1,515
)
 
954

 
(561
)
 
(1,515
)
 
766

 
(749
)
Exelon Corporate
 
 
 
 
 
 
 
 
 
 
 
 
Software License(a)
 
95

 
(34
)
 
61

 
95

 
(25
)
 
70

Exelon
 
$
1,267

 
$
(1,149
)
 
$
118

 
$
1,228

 
$
(1,255
)
 
$
(27
)

__________
(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 in 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.
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, 2018:
For the Years Ending December 31,
 
Exelon
 
Generation
 
ComEd
 
PHI
2019
 
$
(32
)
 
$
70

 
$
7

 
$
(119
)
2020
 
(20
)
 
78

 
7

 
(115
)
2021
 
(4
)
 
78

 
—

 
(92
)
2022
 
(23
)
 
56

 
—

 
(89
)
2023
 
(21
)
 
50

 
—

 
(81
)
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, 2018, 2017 and 2016:
For the Years Ended December 31,
 
Exelon (a)(b)
 
Generation (a)
 
ComEd
 
PHI(b)
2018
 
$
(109
)
 
$
63

 
$
7

 
$
(188
)
2017
 
(237
)
 
83

 
7

 
(336
)
2016
 
(336
)
 
79

 
7

 
(430
)
__________
(a)
At Exelon and Generation, amortization of unamortized energy contracts totaling $14 million, $35 million and $35 million for the years ended December 31, 2018, 2017 and 2016, respectively, was recorded in Operating revenues or Purchased power and fuel expense in their Consolidated Statements of Operations and Comprehensive Income
Schedule of Alternative or Renewable Energy Credits [Table Text Block]
The following table summarizes the current and noncurrent Renewable and Alternative Energy Credits as of December 31, 2018 and 2017:
 
As of December 31, 2018
 
Exelon
 
Generation
 
PECO
 
PHI
 
DPL
 
ACE
Current AEC's
$
2

 
$
—

 
$
2

 
$
—

 
$
—

 
$
—

Current REC's
279

 
270

 
—

 
9

 
8

 
1

Noncurrent REC's
52

 
52

 
—

 
—

 
—

 
—

 
As of December 31, 2017
 
Exelon
 
Generation
 
PECO
 
PHI
 
DPL
 
ACE
Current AEC's
$
1

 
$
—

 
$
1

 
$
—

 
$
—

 
$
—

Current REC's
321

 
312

 
—

 
9

 
8

 
1

Noncurrent REC's
27

 
27

 
—

 
—

 
—

 
—
[1] (b)Reflects goodwill recorded in 2016 from the PHI merger.
[2] Reflects goodwill recorded in 2000 from the PECO/Unicom merger (predecessor parent company of ComEd).