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Jointly Owned Electric Utility Plant (Tables)
 12 Months Ended
Dec. 31, 2018
Public Utilities, Property, Plant and Equipment [Abstract]  
Schedule of Jointly Owned Utility Plants
Exelon's, Generation's, PECO's, BGE's, Pepco's, DPL's and ACE's undivided ownership interests in jointly owned electric plants and transmission facilities at December 31, 2018 and 2017 were as follows:
 
Nuclear Generation
 
Fossil-Fuel Generation
 
Transmission
 
Other
 
Quad Cities
 
Peach
Bottom
 
Salem(a)
 
Nine Mile Point Unit 2
 
Wyman
 
PA(b)
 
NJ/ DE(c)
 
Other(d)
Operator
Generation
 
Generation
 
PSEG
Nuclear
 
Generation
 
FP&L
 
First
Energy
 
PSEG/ DPL
 
various
Ownership interest
75.00
%
 
50.00
%
 
42.59
%
 
82.00
%
 
5.89
%
 
various

 
various

 
various

Exelon’s share at December 31, 2018:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Plant(e)
$
1,131

 
$
1,451

 
$
648

 
$
910

 
$
4

 
$
28

 
$
103

 
$
15

Accumulated depreciation(e)
587

 
523

 
227

 
126

 
3

 
16

 
53

 
13

Construction work in progress
13

 
15

 
44

 
56

 
—

 
1

 
—

 
—

Exelon’s share at December 31, 2017:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Plant(e)
$
1,074

 
$
1,417

 
$
631

 
$
839

 
$
3

 
$
27

 
$
102

 
$
15

Accumulated depreciation(e)
550

 
461

 
205

 
97

 
3

 
15

 
52

 
13

Construction work in progress
35

 
18

 
33

 
55

 
—

 
—

 
—

 
—

__________
(a)
Generation also owns a proportionate share in the fossil-fuel combustion turbine at Salem, which is fully depreciated. The gross book value was $3 million at December 31, 2018 and 2017.
(b)
PECO, BGE, Pepco, DPL and ACE own a 22%, 7%, 27%, 9% and 8% share, respectively, in 127 miles of 500kV lines located in Pennsylvania as well as a 20.72%, 10.56%, 9.72%, 3.72% and 3.83% share, respectively, of a 500kV substation immediately outside of the Conemaugh fossil-generating station which supplies power to the 500kV lines including, but not limited to, the lines noted above.
(c)
PECO, DPL and ACE own a 42.55%, 1% and 13.9% share, respectively in 151.3 miles of 500kV lines located in New Jersey and of the Salem generating plant substation. PECO, DPL and ACE also own a 42.55%, 7.45% and 7.45% share, respectively, in 2.5 miles of 500kV line located over the Delaware River. ACE also has a 21.78% share in a 500kV New Freedom Switching substation.
(d)
Generation, DPL and ACE own a 44.24%, 11.91% and 4.83% share, respectively in assets located at Merrill Creek Reservoir located in New Jersey. Pepco, DPL and ACE own a 11.9%, 7.4% and 6.6% share, respectively, in Valley Forge Corporate Center.
(e)
Excludes asset retirement costs and general plant.