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Regulatory Matters (Tables)
 3 Months Ended
Mar. 31, 2019
Regulated Operations [Abstract]  
Public Utilities General Disclosures [Table Text Block]
The following table presents authorized amounts capitalized for ratemaking purposes related to earnings on shareholders’ investment that are not recognized for financial reporting purposes in Exelon's and the Utility Registrant's Consolidated Balance Sheets. These amounts will be recognized as revenues in the related Consolidated Statements of Operations and Comprehensive Income in the periods they are billable to our customers.
 
Exelon
 
ComEd(a)
 
PECO
 
BGE(b)
 
PHI
 
Pepco(c)
 
DPL(c)
 
ACE
March 31, 2019
$
64

 
$
7

 
$
—

 
$
49

 
$
8

 
$
5

 
$
3

 
$
—

December 31, 2018
$
65

 
$
8

 
$
—

 
$
49

 
$
8

 
$
5

 
$
3

 
$
—

_________
(a)
Reflects ComEd's unrecognized equity returns earned for ratemaking purposes on its electric distribution formula rate regulatory assets.
(b)
BGE's authorized amounts capitalized for ratemaking purposes primarily relate to earnings on shareholders' investment on its AMI programs.
(c)
Pepco's and DPL's authorized amounts capitalized for ratemaking purposes relate to earnings on shareholders' investment on their respective AMI Programs and Energy Efficiency and Demand Response Programs. The earnings on energy efficiency are on Pepco DC and DPL DE programs only.