Minimum Equity To Total Capitalization Ratio To Be Maintained For Payment Of Capital Dividend

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Represents the current and noncurrent portions of a debt security issued by a state, certain agencies or authorities, a local government, or development corporation to finance the construction of air- or water-pollution control facilities or sewage or solid waste disposal facilities pursuant to federal law. The bonds are backed by the credit of the beneficiary of the financing rather than the credit of the issuer.

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Long-Term transition bonds are bonds under the Competition Act in which the proceeds of Transition Bonds are required to be used principally to reduce qualified stranded costs and the related capitalization of the utility. This represents the current and noncurrent portions. The initial maturity is beyond one year or beyond the normal operating cycle, if longer.

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Capitalization (Details Textuals)											3 Months Ended								12 Months Ended
Capitalization (Details Textuals)	Jan. 19, 2017 $ / shares	Dec. 13, 2016 USD ($) shares	Dec. 06, 2016 USD ($)	Oct. 17, 2016 USD ($)	Sep. 30, 2016 USD ($)	Sep. 15, 2016 USD ($)	Aug. 15, 2016 USD ($)	Jul. 01, 2016 USD ($)	Jun. 01, 2016 USD ($)	May 01, 2016 USD ($)	Dec. 31, 2016 USD ($) $ / shares shares	Sep. 30, 2016 $ / shares	Jun. 30, 2016 $ / shares	Mar. 31, 2016 $ / shares	Dec. 31, 2015 USD ($) $ / shares shares	Sep. 30, 2015 $ / shares	Jun. 30, 2015 $ / shares	Mar. 31, 2015 $ / shares	Dec. 31, 2016 USD ($) subsidiary $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 $ / shares shares	Dec. 15, 2016 USD ($)	Dec. 05, 2016 USD ($)	Sep. 23, 2016 USD ($)	Jun. 30, 2013 USD ($)
Debt Instrument [Line Items]
Retained earnings (accumulated deficit)											$ (4,532,000,000)				$ 2,256,000,000				$ (4,532,000,000)	$ 2,256,000,000
Dividends declared, in dollars per share \| $ / shares																			$ 1.44	$ 1.44	$ 1.44
Common stock dividends per share paid, in dollars per share \| $ / shares											$ 0.36	$ 0.36	$ 0.36	$ 0.36	$ 0.36	$ 0.36	$ 0.36	$ 0.36
FERC-defined equity to total capitalization ratio																			35.00%
Preferred shares shares outstanding \| shares											0				0				0	0
Preference shares outstanding \| shares											0				0				0	0
Number of subsidiaries that issued environmental control bonds \| subsidiary																			2
Environmental control bonds outstanding											$ 406,000,000				$ 429,000,000				$ 406,000,000	$ 429,000,000
Transition bond outstanding											85,000,000				128,000,000				85,000,000	128,000,000
Principal default amount specified in debt covenants																			100,000,000
Currently payable long-term debt											1,685,000,000				1,166,000,000				1,685,000,000	1,166,000,000
Subsequent Event
Debt Instrument [Line Items]
Dividends declared, in dollars per share \| $ / shares	$ 0.36
Phase In Recovery Bonds
Debt Instrument [Line Items]
Long-term debt and other long-term obligations											339,000,000				362,000,000				$ 339,000,000	362,000,000
Term Loan
Debt Instrument [Line Items]
Face amount of loan			$ 1,200,000,000.0																				$ 1,000,000,000
Term of revolving credit facility			5 years
AGC
Debt Instrument [Line Items]
FERC-defined equity to total capitalization ratio																			45.00%
FES
Debt Instrument [Line Items]
Retained earnings (accumulated deficit)											(3,509,000,000)				1,946,000,000				$ (3,509,000,000)	1,946,000,000
Currently payable long-term debt											179,000,000				$ 512,000,000				179,000,000	$ 512,000,000
FG \| Loans Payable
Debt Instrument [Line Items]
Debt repaid					$ 12,000,000	$ 12,000,000
FG \| Loans Payable \| Fixed Rate PCRB
Debt Instrument [Line Items]
Face amount of loan											$ 86,000,000								86,000,000
FG \| Loans Payable \| Variable Rate PCRB
Debt Instrument [Line Items]
Debt repaid																			12,000,000
FG \| PCRB
Debt Instrument [Line Items]
Debt repaid								$ 60,000,000	$ 225,000,000
FG \| PCRB \| Fixed Rate PCRB
Debt Instrument [Line Items]
Interest rate (percent)						4.25%
Face amount of loan						$ 100,000,000
FG \| Line of Credit \| Variable Rate PCRB
Debt Instrument [Line Items]
Elimination of LOC																			92,000,000
NG \| PCRB \| 4.375% Fixed PCRB
Debt Instrument [Line Items]
Interest rate (percent)							4.375%
Face amount of loan							$ 285,000,000
JCP&L \| Senior Notes \| 5.625% Senior Unsecured Notes Due May 2016
Debt Instrument [Line Items]
Repayments of Senior notes										$ 300,000,000
Interest rate (percent)										5.625%
WP \| FMBs
Debt Instrument [Line Items]
Debt repaid							$ 145,000,000
Interest rate (percent)							5.875%
Face amount of loan																						$ 100,000,000
WP \| FMBs \| $475M Million First Mortgage Bonds 3.84% Due 2046
Debt Instrument [Line Items]
Interest rate (percent)																								3.84%
Face amount of loan																								$ 475,000,000
WP \| FMBs \| $100M FMBs 3.84% Due 2046
Debt Instrument [Line Items]
Interest rate (percent)																								3.84%
Face amount of loan																								$ 100,000,000
WP \| FMBs \| $100M FMBs 4.09% Due 2047
Debt Instrument [Line Items]
Interest rate (percent)																								4.09%
Face amount of loan																								$ 100,000,000
WP \| FMBs \| $275M FMBs 4.14% Due 2047
Debt Instrument [Line Items]
Interest rate (percent)																								4.14%
Face amount of loan																								$ 275,000,000
WP \| FMBs \| $275M FMBs 5.95% Due December 2017
Debt Instrument [Line Items]
Debt repaid																			$ 275,000,000
Interest rate (percent)											5.95%								5.95%
PE \| FMBs \| $155 M FMBs, 3.89% Due 2046
Debt Instrument [Line Items]
Interest rate (percent)				3.89%
Face amount of loan				$ 155,000,000
PE \| FMBs \| $100M FMBs 5.80% Due 2016
Debt Instrument [Line Items]
Debt repaid				$ 100,000,000
Interest rate (percent)				5.80%
Ohio Funding Companies \| Phase In Recovery Bonds
Debt Instrument [Line Items]
Face amount of loan																									$ 445,000,000
Common Stock
Debt Instrument [Line Items]
Stock issuance - employee benefits, Shares \| shares																			2,685,946	2,457,827	2,474,011
Minimum \| FMBs
Debt Instrument [Line Items]
Interest rate (percent)											3.34%								3.34%
Minimum \| FG \| PCRB \| Fixed Rate PCRB
Debt Instrument [Line Items]
Interest rate (percent)							4.25%
Face amount of loan							$ 86,000,000
Maximum \| FMBs
Debt Instrument [Line Items]
Interest rate (percent)											9.74%								9.74%
Maximum \| FG \| PCRB \| Fixed Rate PCRB
Debt Instrument [Line Items]
Interest rate (percent)							4.50%
Pension Plan [Member]
Debt Instrument [Line Items]
Stock issuance - employee benefits, Shares \| shares		16,097,875
Stock Investment Plan and certain share-based benefit plans		$ 500,000,000
Revolving Credit Facility \| Parent and Certain Subsidiaries
Debt Instrument [Line Items]
Term of revolving credit facility			5 years