XML 143 R125.htm IDEA: XBRL DOCUMENT

Regulatory Matters - Maryland and New Jersey (Details) $ in Millions						12 Months Ended	24 Months Ended	36 Months Ended
	Dec. 12, 2016 USD ($)	Nov. 02, 2016 USD ($)	Apr. 28, 2016 USD ($)	Jul. 16, 2015	Feb. 27, 2013 USD ($)	Dec. 31, 2016 component basic_generation_service	Dec. 31, 2016 USD ($) component basic_generation_service	Dec. 31, 2017 USD ($)
Maryland
Regulatory Matters [Line Items]
Expected infrastructure investments					$ 2,700.0
Expected infrastructure investments, period					15 years
New Jersey
Regulatory Matters [Line Items]
Number of supply components \| component						2	2
Number of BGS \| basic_generation_service						1	1
PE \| Maryland
Regulatory Matters [Line Items]
Expenditures for cost recovery program incurred							$ 43.0
Incremental energy savings goal in the next 12 months (percent)				0.97%
Incremental energy savings goal per year (percent)				0.20%
Incremental energy savings goal thereafter (percent)				2.00%
Amortization period for expenditures for cost recovery program						5 years
JCP&L \| New Jersey \| NJBPU
Regulatory Matters [Line Items]
Requested rate increase (decrease)			$ 142.1
Requested increase in revenues		$ 80.0
Public Utilities, Approved Annual Increase to Accelerated Amortization	$ 19.0
Forecast \| PE \| Maryland
Regulatory Matters [Line Items]
Expenditures for cost recovery program								$ 70.0