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Stockholders' Equity Mandatory Convertible Preferred Stock (Details) $ / shares in Units, $ in Millions |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Oct. 18, 2017 $ / shares | Jul. 19, 2017 $ / shares | Apr. 19, 2017 $ / shares | Jan. 18, 2017 $ / shares | Oct. 30, 2015 USD ($) $ / shares shares | Dec. 31, 2017 $ / shares shares | Dec. 31, 2016 $ / shares
Class of Stock [Line Items] |  |  |  |  |  |  |
Depositary Share Offering | shares |  |  |  |  | 32,000,000 |  |
Amount of Interest Each Depositary Share has in a 9.75% Series A Mandatory Convertible Preferred Share |  |  |  |  | 0.0005 |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  |  | 9.75% | 9.75%
Preferred Stock, Liquidation Preference Per Share |  |  |  |  |  | $ 1,000 | $ 1,000
Depositary Shares, Liquidation Preference Per Share |  |  |  |  | $ 50 |  |
Proceeds from Depositary Share Offering | $ |  |  |  |  | $ 1,541 |  |
Number of days in Average Trading Period |  |  |  |  |  | 20 |
Greater Than Applicable Market Value of Common Stock |  |  |  |  |  | $ 32.38 |
Less Than Applicable Market Value of Common Stock |  |  |  |  |  | $ 27.56 |
9.75% Series A Mandatory Convertible, $1,000 per share liquidation preference |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Issuances of common shares | shares |  |  |  |  | 1,600,000 |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  | 9.75% | 9.75% |
Preferred Stock, Liquidation Preference Per Share |  |  |  |  | $ 1,000 |  |
Dividends, Preferred Stock | $ 24.375 | $ 24.375 | $ 24.375 | $ 24.375 |  | $ 24.375 |
Depositary Stock, Dividends Per Share, Declared |  |  |  |  |  | $ 1.21875 |
Minimum [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Depositary Shares, Shares Issued Upon Conversion | shares |  |  |  |  |  | 1.5440 |
Applicable Market Value of Common Stock |  |  |  |  |  | $ 27.56 |
Minimum [Member] | 9.75% Series A Mandatory Convertible, $1,000 per share liquidation preference |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Convertible Preferred Stock, Shares Issued upon Conversion | shares |  |  |  |  |  | 30.8800 |
Maximum [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Depositary Shares, Shares Issued Upon Conversion | shares |  |  |  |  |  | 1.8142 |
Applicable Market Value of Common Stock |  |  |  |  |  | $ 32.38 |
Maximum [Member] | 9.75% Series A Mandatory Convertible, $1,000 per share liquidation preference |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Convertible Preferred Stock, Shares Issued upon Conversion | shares |  |  |  |  |  | 36.2840 |

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