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Capitalization (Details) | Jul. 27, 2018 shares | Jan. 22, 2018 USD ($) employee $ / shares shares | Jun. 30, 2018 $ / shares shares | Dec. 31, 2017 $ / shares
--- | --- | --- | --- | ---
Class of Stock [Line Items] |  |  |  |
Proceeds from issuance of equity |  | $ 2,500,000,000 |  |
Par Value, in dollars per share | $ / shares |  | $ 100 |  |
Amount of private placement shares | shares |  | 30,120,482 |  |
Common stock, par value (in dollars per share) | $ / shares |  | $ 0.10 | $ 0.1 | $ 0.1
Amount of private placement |  | $ 850,000,000 |  |
Liquidation preference value |  | $ 1,000 |  |
Conversion price (in dollars per share) | $ / shares |  | $ 27.42 |  |
Conversion threshold of Preferred Stock (in shares) | shares |  | 323,200 |  |
Common stock share cap (in shares) | shares |  | 58,964,222 |  |
RWG number of board members | employee |  | 2 |  |
Other Paid-in Capital |  |  |  |
Class of Stock [Line Items] |  |  |  |
Amount of private placement |  | $ 847,000,000 |  |
Common Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Amount of private placement |  | $ 3,000,000 |  |
Series A Convertible Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock shares issued | shares |  | 1,616,000 | 1,616,000 |
Par Value, in dollars per share | $ / shares |  |  | $ 100 |
Amount of preferred stock investment |  | $ 1,620,000,000 |  |
Series A Convertible Preferred Stock | Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Amount of preferred stock investment |  | 162,000,000 |  |
Series A Convertible Preferred Stock | Other Paid-in Capital |  |  |  |
Class of Stock [Line Items] |  |  |  |
Amount of preferred stock investment |  | $ 1,460,000,000 |  |
FirstEnergy |  |  |  |
Class of Stock [Line Items] |  |  |  |
RWG number of board members | employee |  | 3 |  |
Subsequent Event | Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Number of shares converted (in shares) | shares | 224,714 |  |  |
Subsequent Event | Common Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Number of shares issued (in shares) | shares | 8,195,257 |  |  |

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