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Stockholders' Equity - Additional Information (Details) (USD $) | 0 Months Ended | 3 Months Ended | 9 Months Ended |  |  | 0 Months Ended | 3 Months Ended | 9 Months Ended | 1 Months Ended |  |
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Jul. 02, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Sep. 30, 2013 | Mar. 31, 2013 Subsidiary | Sep. 30, 2014 | Sep. 30, 2013 | Jul. 30, 2014 | Jun. 28, 2013 | Sep. 30, 2014 Series B Preferred Stock [Member] | Sep. 30, 2014 Series B Preferred Stock [Member] | Sep. 29, 2014 Series B Preferred Stock [Member] | Sep. 30, 2014 Series B Preferred Stock [Member] | Jul. 31, 2013 Series A Preferred Stock [Member] | Sep. 30, 2014 Preferred Stock [Member] | Dec. 31, 2013 Preferred Stock [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred dividends description |  |  |  |  |  |  | Our 4.0% Series B Convertible Preferred Stock ceased accruing dividends as a result of the conversion of all of the remaining outstanding shares on September 30, 2014. Our 4.0% Series A Convertible Preferred Stock ceased accruing dividends as a result of redemption in August 2013. |  |  |  |  |  |  |  |  |  |
Series A and Series B preferred stock dividend rate percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.00% | 4.00% |  |
Dividends accrued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000 | $ 4,000,000
Shares of preferred stock converted |  |  |  |  |  |  |  |  |  |  | 1,506,972 | 1,772,693 | 2,296,802 |  |  |  |
Common stock issued during period on conversion of convertible securities |  |  |  |  |  |  |  |  |  |  | 12,631,780 |  | 19,517,593 |  |  |  |
Fair value of conversions |  |  |  |  |  |  |  |  |  |  | 250,000,000 |  | 409,000,000 |  |  |  |
Terms of conversion - closing price of common stock | $ 22.24 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Terms of conversion - consecutive trading days | 20 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion Notice Period | 90 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per common share |  | $ 0.05 | $ 0.05 | $ 0.05 | $ 0.05 |  | $ 0.15 | $ 0.15 |  |  |  |  |  |  |  |  |
Treasury stock reissued during period |  | 14,879,935 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Charge to Additional Paid in Capital |  | 127,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  | 1,400,000,000 | 1,000,000,000 |  |  |  |  |  |  |
Repurchases of common stock |  |  |  |  |  |  | 181,000,000 | 288,000,000 |  |  |  |  |  |  |  |  |
Shares repurchased during period |  |  |  |  |  |  | 8,295,202 |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  | 390,000,000 |  |  |  |  | 390,000,000 |  |  |  |  |  |  |  |  |  |
Number of subsidiaries in which Noncontrolling Interests were purchased |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |
Payments to Noncontrolling Interests |  |  |  |  |  | $ 7,000,000 |  | $ 7,000,000 |  |  |  |  |  |  |  |  |

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