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Common and Preferred Stock (Narrative) (Detail) - USD ($) $ / shares in Units, $ in Millions |  |  | 2 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 05, 2013 | May. 06, 2013 | Feb. 29, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2008
Class of Stock [Line Items] |  |  |  |  |  |  |
Fair value of warrants |  |  |  | $ 18 | $ 28 |  |
Treasury stock shares acquired |  |  |  | 39,900,000 | 3,300,000 |  |
Treasury stock value acquired cost method |  |  |  | $ 303 | $ 35 | $ 7 |
Shares repurchased under share repurchase program, average price per share |  |  |  | $ 7.6 | $ 10.45 | $ 0 |
Remaining amount available under repurchase program |  |  |  | $ 94 | $ 188 | $ 23 |
Preferred stock shares issued |  |  |  | 0 | 0 |  |
Preferred stock shares outstanding |  |  |  | 0 | 0 |  |
Preferred Stock Par Or Stated Value Per Share |  |  |  | $ 1 | $ 1 |  |
Blue Ridge [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Warrants outstanding |  | 9,940,000 |  |  |  |  |
Warrant exercise price |  | $ 9.59 |  |  |  |  |
Preferred Stock [Member] | MBIA Insurance Corporation [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares repurchased under share repurchase program, average price per share |  |  |  | $ 10,900 |  |  |
Preferred stock shares issued |  |  |  | 2,759 |  |  |
Preferred stock repurchased during period shares |  |  |  | 1,444 |  |  |
Preferred stock, carrying value issued and outstanding |  |  |  | $ 28 |  |  |
Face value of repurchased preferred stock |  |  |  | 10.90% |  |  |
Preferred Stock Par Or Stated Value Per Share |  |  |  | $ 1,000 |  |  |
Preferred stock liquidation preference |  |  |  | $ 100,000 |  |  |
Dividend rate on preferred stock determined rate |  |  |  | LIBOR plus 200 basis points |  |  |
2007 Repurchase Authorization [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Authorized repurchase of common stock, value |  |  |  | $ 1,000 |  |  |
2014 Repurchase Authorization [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Authorized repurchase of common stock, value |  |  |  | 200 |  |  |
Remaining amount available under repurchase program |  |  |  | $ 61 |  |  |
Unaffiliated Investors [Member] | MBIA Insurance Corporation [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock shares outstanding |  |  |  | 1,315 |  |  |
July 29, 2015 Repurchase Authorization [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Authorized repurchase of common stock, value |  |  |  | $ 100 |  |  |
October 28, 2015 Repurchase Authorization [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Authorized repurchase of common stock, value |  |  |  | $ 100 |  |  |
October 28, 2015 Repurchase Authorization [Member] | SubsequentEvent [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Treasury stock shares acquired |  |  | 14,900,000 |  |  |  |
Shares repurchased under share repurchase program, average price per share |  |  | $ 6.3 |  |  |  |
Long-Term Incentive Plan [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Treasury stock shares acquired |  |  |  | 580,692 | 529,246 |  |
Warrant [Member] | Blue Ridge [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Warrant Term |  | 5 years |  |  |  |  |
Warrant [Member] | Warburg Pincus [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Warrants outstanding | 11,800,000 |  |  |  |  |  | 11,500,000
Warrant exercise price | $ 29.44 |  |  |  |  |  | $ 30.25
B Warrants [Member] | Warburg Pincus [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Warrants outstanding | 10,100,000 |  |  |  |  |  | 9,800,000
Warrant exercise price | $ 29.44 |  |  |  |  |  | $ 30.25
B2 Warrants [Member] | Warburg Pincus [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Warrants outstanding | 4,004,945 |  |  |  |  |  | 4,000,000
Warrant exercise price | $ 16.18 |  |  |  |  |  | $ 16.2
Grossup Warrant [Member] | Warburg Pincus [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Warrants outstanding | 1,910,000 |  |  |  |  |  |
Warrant exercise price | $ 9.59 |  |  |  |  |  |
Warrant Term | 5 years |  |  |  |  |  |

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