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Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]  
Schedule Of Goodwill
The following table presents the gross amount of goodwill, accumulated impairment loss and carrying amount of goodwill of Exelon, ComEd and PHI as of December 31, 2019 and 2018. There were no additions, impairments or measurement period adjustments during the years ended December 31, 2019 and 2018.
 
Gross amount
 
Accumulated impairment loss
 
Carrying amount
Exelon
$
8,660

 
$
1,983

 
$
6,677

ComEd(a)
4,608

 
1,983

 
2,625

PHI(b)
4,005

 
—

 
4,005


__________
(a)
Reflects goodwill recorded in 2000 from the PECO/Unicom merger (predecessor parent company of ComEd).
(b)
Reflects goodwill recorded in 2016 from the PHI 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, 2019 and 2018. The intangible assets and liabilities shown below are amortized on a straight line basis, except for unamortized energy contracts which are amortized in relation to the expected realization of the underlying cash flows:
 
 
December 31, 2019
 
December 31, 2018
 
 
Gross
 
Accumulated Amortization
 
Net
 
Gross
 
Accumulated Amortization
 
Net
Generation
 
 
 
 
 

 
 
 
 
 

Unamortized Energy Contracts
 
1,967

 
(1,612
)
 
355

 
1,957

 
(1,588
)
 
369

Customer Relationships
 
343

 
(190
)
 
153

 
325

 
(162
)
 
163

Trade Name
 
243

 
(193
)
 
50

 
243

 
(171
)
 
72

ComEd
 
 
 
 
 

 
 
 
 
 

Chicago Settlement Agreements
 
162

 
(155
)
 
7

 
162

 
(148
)
 
14

PHI
 
 
 
 
 

 
 
 
 
 

Unamortized Energy Contracts
 
(1,515
)
 
1,073

 
(442
)
 
(1,515
)
 
954

 
(561
)
Exelon Corporate
 
 
 
 
 
 
 
 
 
 
 
 
Software License
 
95

 
(44
)
 
51

 
95

 
(34
)
 
61

Exelon
 
$
1,295

 
$
(1,121
)
 
$
174

 
$
1,267

 
$
(1,149
)
 
$
118
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, 2019, 2018 and 2017:
For the Years Ended December 31,
 
Exelon (a)(b)
 
Generation (a)
 
ComEd
 
PHI(b)
2019
 
$
(28
)
 
$
74

 
$
7

 
$
(119
)
2018
 
(109
)
 
63

 
7

 
(188
)
2017
 
(237
)
 
83

 
7

 
(336
)
__________
(a)
At Exelon and Generation, amortization of unamortized energy contracts totaling $21 million, $14 million and $35 million for the years ended December 31, 2019, 2018 and 2017, respectively, was recorded in Operating revenues or Purchased power and fuel expense in their Consolidated Statements of Operations and Comprehensive Income.
(b)
At Exelon and PHI, amortization of the unamortized energy contract fair value adjustment amounts and the corresponding offsetting regulatory asset and liability amounts are amortized through Purchased power and fuel expense in their Consolidated Statements of Operations and Comprehensive Income.
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, 2019:
For the Years Ending December 31,
 
Exelon
 
Generation
 
ComEd
 
PHI
2020
 
$
(13
)
 
$
85

 
$
7

 
$
(115
)
2021
 
2

 
84

 
—

 
(92
)
2022
 
(21
)
 
58

 
—

 
(89
)
2023
 
(18
)
 
53

 
—

 
(81
)
2024
 
22

 
50

 
—

 
(38
)
Schedule of Alternative or Renewable Energy Credits [Table Text Block]
The following table presents the current and noncurrent Renewable Energy Credits as of December 31, 2019 and 2018:
 
As of December 31, 2019
 
As of December 31, 2018
 
Exelon
 
Generation
 
Exelon
 
Generation
Current REC's
345

 
336

 
279

 
270

Noncurrent REC's
86

 
86

 
52

 
52