Subsequent Events (Details)	Jan. 22, 2018 USD ($) employees $ / shares shares	Dec. 31, 2017 $ / shares	Dec. 31, 2016 $ / shares
Subsequent Event [Line Items]
Par Value, in dollars per share		$ 100
Common stock, par value (in dollars per share)		$ 0.1	$ 0.1
Subsequent Event
Subsequent Event [Line Items]
Proceeds from issuance of equity | $	$ 2,500,000,000
Par Value, in dollars per share	$ 100
Amount of private placement shares | shares	30,120,482
Common stock, par value (in dollars per share)	$ 0.10
Amount of private placement | $	$ 850,000,000
Liquidation preference value | $	$ 1,000
Conversion price (in dollars per share)	$ 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 | employees	2
Series A Convertible Preferred Stock | Subsequent Event
Subsequent Event [Line Items]
Preferred stock shares issued | shares	1,616,000
Amount of preferred stock investment | $	$ 1,620,000,000
FE | Subsequent Event
Subsequent Event [Line Items]
RWG number of board members | employees	3