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Capitalization - Narrative (Details) |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 08, 2019 $ / shares | Sep. 30, 2019 $ / shares shares | Aug. 01, 2019 shares | Jul. 22, 2019 shares | Jun. 03, 2019 USD ($) | May 21, 2019 USD ($) | Feb. 08, 2019 USD ($) | Jan. 31, 2018 USD ($) | Jan. 31, 2019 shares | Dec. 31, 2019 USD ($) $ / shares shares | Sep. 30, 2019 $ / shares | Jun. 30, 2019 $ / shares | Mar. 31, 2019 $ / shares | Dec. 31, 2018 USD ($) $ / shares shares | Sep. 30, 2018 USD ($) $ / shares | Jun. 30, 2018 $ / shares | Mar. 31, 2018 $ / shares | Dec. 31, 2019 USD ($) subsidiary $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Nov. 14, 2019 USD ($) | Aug. 15, 2019 USD ($) | Jun. 05, 2019 USD ($) | Apr. 15, 2019 USD ($) | Mar. 28, 2019 USD ($) | Jan. 10, 2019 USD ($) | Jan. 22, 2018 USD ($) $ / shares shares | Jun. 30, 2013 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings (accumulated deficit) |  |  |  |  |  |  |  |  |  | $ (3,967,000,000) |  |  |  | $ (4,879,000,000) |  |  |  | $ (3,967,000,000) | $ (4,879,000,000) |  |  |  |  |  |  |  |  |
Dividends declared (in dollars per share) | $ / shares | $ 0.39 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.53 | $ 1.82 | $ 1.44 |  |  |  |  |  |  |  |
Common stock dividends per share paid, in dollars per share | $ / shares |  |  |  |  |  |  |  |  |  | $ 0.38 | $ 0.38 | $ 0.38 | $ 0.38 | $ 0.36 | $ 0.36 | $ 0.36 | $ 0.36 |  |  |  |  |  |  |  |  |  |  |
FERC-defined equity to total capitalization ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35.00% |  |  |  |  |  |  |  |  |  |
Preferred shares, outstanding (in shares) | shares |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |
Preference shares outstanding | shares |  |  |  |  |  |  |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 | 0 |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 789,000,000 | $ 2,608,000,000 | $ 2,291,000,000 |  |  |  |  |  |  |  |
Number of subsidiaries that issued environmental control bonds | subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |
Environmental control bonds outstanding |  |  |  |  |  |  |  |  |  | $ 333,000,000 |  |  |  | $ 358,000,000 |  |  |  | $ 333,000,000 | 358,000,000 |  |  |  |  |  |  |  |  |
Transition bond outstanding |  |  |  |  |  |  |  |  |  | $ 25,000,000 |  |  |  | $ 41,000,000 |  |  |  | 25,000,000 | $ 41,000,000 |  |  |  |  |  |  |  |  |
Principal default amount specified in debt covenants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |
Amount of private placement shares | shares |  |  |  |  |  |  |  |  |  | 3,000,000 |  |  |  | 3,200,000 |  |  |  | 3,000,000 | 3,200,000 | 3,000,000.0 |  |  |  |  |  |  | 30,120,482 |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 0.10 |  |  |  | $ 0.10 |  |  |  | $ 0.10 | $ 0.10 |  |  |  |  |  |  |  | $ 0.10 |
Amount of private placement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 850,000,000 |
Non-cash transaction: beneficial conversion feature (Note1) |  |  |  |  |  |  |  | $ 296,000,000 |  |  |  |  |  |  |  |  |  | $ 0 | $ 296,000,000 | $ 0 |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 100 |  |  |  | $ 100 |  |  |  | $ 100 | $ 100 |  |  |  |  |  |  |  | $ 100 |
Liquidation preference value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 |
Conversion price (in dollars per share) | $ / shares |  | $ 27.42 |  |  |  |  |  |  |  |  | $ 27.42 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Right to tender in 2021 |  |  |  |  |  |  |  |  |  | $ 882,000,000 |  |  |  |  |  |  |  | $ 882,000,000 |  |  |  |  |  |  |  |  |  |
Phase In Recovery Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt and other long-term obligations |  |  |  |  |  |  |  |  |  | 268,000,000 |  |  |  | $ 292,000,000 |  |  |  | $ 268,000,000 | $ 292,000,000 |  |  |  |  |  |  |  |  |
TrAIL and AGC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FERC-defined equity to total capitalization ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45.00% |  |  |  |  |  |  |  |  |  |
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% |  |
ME | Senior Notes | 7.70% Senior Notes Due 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000,000 |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.70% |  |
MP | PCRB |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Right to tender in 2021 |  |  |  |  |  |  |  |  |  | $ 73,500,000 |  |  |  |  |  |  |  | $ 73,500,000 |  |  |  |  |  |  |  |  |  |
MP | FMBs | 155M FMB's, 3.23%, Due 2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 155,000,000 |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.23% |  |  |  |  |  |  |
MP | FMBs | 45M FMB's, 3.93%, Due 2049 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 45,000,000 |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.93% |  |  |  |  |  |  |
WP | FMBs | 155M FMB's, 4.22% Due 2059 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 150,000,000 |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.22% |  |  |  |  |  |
WP | Senior Notes | 100M FMB's, 4.22% Due 2059 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  | 4.22% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
JCP&L | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of loan |  |  |  |  |  |  | $ 400,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
JCP&L | Senior Notes | 4.30% Senior Notes Due 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  | 4.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
JCP&L | Senior Notes | 7.35% Senior Notes Due 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  | 7.35% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FET | Senior Notes | 4.55% Senior Notes Due 2049 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.55% |  |  |
ATSI | Senior Notes | 4.38% Senior Notes Due 2031 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.38% |  |  |  |
Penn |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 100 |  |  |  |  |  |  |  | $ 100 |  |  |  |  |  |  |  |  |  |
PN | Senior Notes | 3.60% Senior Notes Due 2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of loan |  |  |  |  | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  | 3.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PN | Senior Notes | 6.63% Senior Notes Due 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  | 6.63% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  | $ 125,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AGC | Senior Notes | 4.47% Senior Unsecured Notes Due 2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000,000 |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.47% |  |  |  |  |
Ohio Funding Companies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate annual servicing fees receivable for phase-in recovery bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 445,000 |  |  |  |  |  |  |  |  |  |
Ohio Funding Companies | Phase In Recovery Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 445,000,000
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of private placement shares | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 33,238,910 |  |  |  |  | 33,238,910 |  |  |  |  |  |  |  |  |
Amount of private placement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,000,000 |
Number of shares issued | shares |  | 58,935,078 | 6,619,985 | 1,032,165 |  |  |  |  | 18,044,018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Paid-In Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of private placement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 847,000,000 |
Non-cash transaction: beneficial conversion feature (Note1) |  |  |  |  |  |  |  | $ 296,000,000 |  |  |  |  |  |  | $ 296,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares converted | shares |  | 1,616,000 |  | 28,302 |  |  |  |  | 494,767 |  |  |  |  |  |  |  |  |  | 911,411 |  |  |  |  |  |  |  |  |
Series A Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock shares issued | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,616,000 |
Preferred shares, outstanding (in shares) | shares |  |  | 181,520 |  |  |  |  |  |  | 0 |  |  |  | 704,589 |  |  |  | 0 | 704,589 |  |  |  |  |  |  |  |  |
Preferred stock ownership cap (percent) |  | 4.90% |  |  |  |  |  |  |  |  | 4.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |

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