Common Stock, Conversion, Purchase Agreement, Shares Issued, Threshold

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Debt Instrument, Number of Agreements

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

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Number Of Subsidiaries That Issued Environmental Control Bonds

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Payments of Debt Redemption Make-whole Premiums

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Preference Stock Shares Outstanding.

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Preferred Stock, Purchase Agreement, Number of Shares to be Converted in Next Two Years

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Preferred Stock, Purchase Agreement, Shares Outstanding, Conversion Threshold

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Principal Default Amount Specified In Debt Covenants.

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Restructuring Working Group, Number of Employees

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Aggregate dividends paid during the period for each share of common stock outstanding.

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Face amount or stated value per share of common stock.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.

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The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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The number of new shares issued in the conversion of stock in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Period between issuance and maturity of long-term debt, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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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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Value of the difference between preference in liquidation and the par or stated values of the preferred shares.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity.

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The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Number of shares issued during the period to an employee benefit plan, such as a defined contribution or defined benefit plan.

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Capitalization (Details Textuals)										1 Months Ended	3 Months Ended								12 Months Ended
Capitalization (Details Textuals)	Nov. 09, 2018 $ / shares	Nov. 02, 2018 USD ($)	Oct. 15, 2018 USD ($)	Jun. 15, 2018 USD ($)	Jun. 11, 2018 USD ($)	Jun. 04, 2018 USD ($)	May 03, 2018 USD ($)	Jan. 22, 2018 USD ($) employee agreement $ / shares shares	Dec. 13, 2016 USD ($) shares	Jan. 31, 2019 shares	Dec. 31, 2017 USD ($) $ / shares shares	Sep. 30, 2017 $ / shares	Jun. 30, 2017 $ / shares	Mar. 31, 2017 $ / shares	Dec. 31, 2016 $ / shares	Sep. 30, 2016 $ / shares	Jun. 30, 2016 $ / shares	Mar. 31, 2016 $ / shares	Dec. 31, 2018 USD ($) subsidiary $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Feb. 08, 2019 USD ($)	Jan. 10, 2019 USD ($)	Oct. 19, 2018 USD ($)	Oct. 03, 2018 USD ($)	Sep. 27, 2018 USD ($)	Jul. 10, 2018 USD ($)	May 10, 2018 USD ($)	Jun. 30, 2013 USD ($)
Debt Instrument [Line Items]
Proceeds from issuance of stock								$ 2,500,000,000
Retained earnings (accumulated deficit)											$ (6,262,000,000)								$ (4,879,000,000)	$ (6,262,000,000)
Dividends declared, in dollars per share \| $ / shares	$ 0.38																		$ 1.82	$ 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%
Stock Investment Plan and certain share-based benefit plans																			$ 62,000,000	$ 56,000,000	$ 56,000,000
Preferred shares shares outstanding \| shares											0								0	0
Preference shares outstanding \| shares											0								0	0
Repayments of debt																			$ 2,608,000,000	$ 2,291,000,000	$ 2,331,000,000
Number of subsidiaries that issued environmental control bonds \| subsidiary																			2
Environmental control bonds outstanding											$ 383,000,000								$ 358,000,000	383,000,000
Transition bond outstanding											$ 56,000,000								41,000,000	$ 56,000,000
Principal default amount specified in debt covenants																			$ 100,000,000
Amount of private placement shares \| shares								30,120,482
Common stock, par value (in dollars per share) \| $ / shares								$ 0.10			$ 0.1								$ 0.1	$ 0.1
Amount of private placement								$ 850,000,000
Preferred stock, par value, in dollars per share \| $ / shares								$ 100											$ 100
Liquidation preference value								$ 1,000
Conversion price (in dollars per share) \| $ / shares								$ 27.42
Common stock share cap (in shares) \| shares								58,964,222
Conversion threshold of Preferred Stock (in shares) \| shares								323,200
Number of shares to be converted in the next two years \| shares								0
RWG number of board members \| employee								2
Phase In Recovery Bonds
Debt Instrument [Line Items]
Long-term debt and other long-term obligations											$ 315,000,000								$ 292,000,000	$ 315,000,000
Term Loan
Debt Instrument [Line Items]
Face amount of loan								$ 125,000,000
Number of loans \| agreement								2
AGC \| Senior Notes \| 5.06% Senior Notes Due 2021
Debt Instrument [Line Items]
Interest rate (percent)							5.06%
Make-whole premiums							$ 5,700,000
Repayments of debt							$ 100,000,000
MAIT \| Senior Notes \| 4.1% Senior Notes Due 2028
Debt Instrument [Line Items]
Face amount of loan																												$ 450,000,000
Interest rate (percent)																												4.10%
AE Supply \| PCRB
Debt Instrument [Line Items]
Interest rate (percent)					5.25%
Repayments of debt					$ 142,000,000
AE Supply \| Senior Notes \| 5.75% Senior Notes Due 2019
Debt Instrument [Line Items]
Interest rate (percent)						5.75%
Repayments of debt						$ 155,000,000
AE Supply \| Senior Notes \| 6.75% Senior Notes Due 2039
Debt Instrument [Line Items]
Interest rate (percent)						6.75%
Make-whole premiums						$ 83,300,000
Repayments of debt						$ 150,000,000
AE Supply and MP \| PCRB \| 5.5% Pollution Control Revenue Bond Due 2037
Debt Instrument [Line Items]
Interest rate (percent)						5.50%
Repayments of debt						$ 73,500,000
OE \| FMBs \| $25M First Mortgage Bonds, 8.25% Due 2018
Debt Instrument [Line Items]
Interest rate (percent)			8.25%
Repayments of debt			$ 25,000,000
AGC
Debt Instrument [Line Items]
FERC-defined equity to total capitalization ratio																			45.00%
MP \| PCRB \| 3% PCRB Due 2021
Debt Instrument [Line Items]
Face amount of loan																											$ 73,500,000
Interest rate (percent)																											3.00%
JCP&L \| Senior Notes \| 4.8% Senior Notes Due 2018
Debt Instrument [Line Items]
Interest rate (percent)				4.80%
Repayments of debt				$ 150,000,000
ATSI \| Senior Notes \| 4.32% Senior Notes Due 2030
Debt Instrument [Line Items]
Face amount of loan																										$ 100,000,000
Interest rate (percent)																										4.32%
Penn
Debt Instrument [Line Items]
Preferred stock, par value, in dollars per share \| $ / shares																			$ 100
Penn \| FMBs \| $50M First Mortgage Bonds, 4.37% Due 2048
Debt Instrument [Line Items]
Face amount of loan																									$ 50,000,000
Interest rate (percent)																									4.37%
CEI \| FMBs \| $300M FMB's, 8.88% Due 2018
Debt Instrument [Line Items]
Interest rate (percent)		8.875%
Repayments of debt		$ 300,000,000
CEI \| Senior Notes \| 4.55% Senior Unsecured Notes Due 2030
Debt Instrument [Line Items]
Face amount of loan		$ 300,000,000
Interest rate (percent)		4.55%
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																			3,200,000	3,000,000	2,700,000
Stock Investment Plan and certain share-based benefit plans																			$ 1,000,000
Amount of private placement								$ 3,000,000
Number of shares issued \| shares																			33,238,910
Other Paid-In Capital
Debt Instrument [Line Items]
Stock Investment Plan and certain share-based benefit plans																			$ 61,000,000	$ 56,000,000	$ 56,000,000
Amount of private placement								$ 847,000,000
Preferred Stock
Debt Instrument [Line Items]
Number of shares converted \| shares																			911,411
Pension
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
Subsequent Event
Debt Instrument [Line Items]
Preferred shares shares outstanding \| shares										209,822
Subsequent Event \| JCP&L \| Senior Notes
Debt Instrument [Line Items]
Face amount of loan																						$ 400,000,000
Subsequent Event \| JCP&L \| Senior Notes \| 4.30% Senior Notes Due 2026
Debt Instrument [Line Items]
Interest rate (percent)																						4.30%
Subsequent Event \| JCP&L \| Senior Notes \| 7.35% Senior Notes Due 2019
Debt Instrument [Line Items]
Interest rate (percent)																						7.35%
Subsequent Event \| ME \| Senior Notes \| 4.30% Senior Notes Due 2029
Debt Instrument [Line Items]
Face amount of loan																							$ 500,000,000
Interest rate (percent)																							4.30%
Subsequent Event \| ME \| Senior Notes \| 7.70% Senior Notes Due 2019
Debt Instrument [Line Items]
Interest rate (percent)																							7.70%
Subsequent Event \| Common Stock
Debt Instrument [Line Items]
Number of shares issued \| shares										18,044,018
Subsequent Event \| Preferred Stock
Debt Instrument [Line Items]
Number of shares converted \| shares										494,767
Series A Convertible Preferred Stock
Debt Instrument [Line Items]
Preferred stock shares issued \| shares								1,616,000
Preferred shares shares outstanding \| shares																			704,589
Amount of preferred stock investment								$ 1,620,000,000
Series A Convertible Preferred Stock \| Other Paid-In Capital
Debt Instrument [Line Items]
Amount of preferred stock investment								1,460,000,000
Series A Convertible Preferred Stock \| Preferred Stock
Debt Instrument [Line Items]
Amount of preferred stock investment								$ 162,000,000
FE
Debt Instrument [Line Items]
RWG number of board members \| employee								3
FE \| Term Loan \| Term Loan Due 2020
Debt Instrument [Line Items]
Face amount of loan																								$ 1,250,000,000.00
Debt term																								364 days
FE \| Variable Rate Term Loan
Debt Instrument [Line Items]
Repayments of debt								$ 1,200,000,000
FE \| Variable Rate Term Loan \| Variable Rate Term Loan Due 2020
Debt Instrument [Line Items]
Face amount of loan																								$ 500,000,000
Debt term																								2 years