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Jointly Owned Electric Utility Plant (Tables)
 12 Months Ended
Dec. 31, 2016
Public Utilities, Property, Plant and Equipment [Abstract]  
Schedule of Jointly Owned Utility Plants
Exelon's, Generation's, PECO's, BGE's, PHI's and ACE's undivided ownership interests in jointly owned electric plants and transmission facilities at December 31, 2016 and 2015 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, 2016:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Plant(e)
$
1,054

 
$
1,384

 
$
596

 
$
830

 
$
3

 
$
27

 
$
97

 
$
15

Accumulated depreciation(e)
515

 
407

 
186

 
68

 
3

 
15

 
52

 
13

Construction work in progress
—

 
16

 
41

 
37

 
—

 
—

 
—

 
—

Exelon’s share at December 31, 2015:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Plant(e)
$
1,035

 
$
1,345

 
$
566

 
$
756

 
$
3

 
$
27

 
$
93

 
$
15

Accumulated depreciation(e)
309

 
368

 
167

 
42

 
3

 
15

 
52

 
13

Construction work in progress
11

 
18

 
40

 
56

 
—

 
—

 
—

 
—

________________________
(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, 2016 and 2015.
(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 Delaware Station. 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
(d)
Generation, DPL and ACE own a 44.24%, 4.83% and 11.91% 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.