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Investments (Narrative) (Details) (USD $)
Mar. 31, 2012
Y
Dec. 31, 2011
Y
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Fair value of securities on deposit with various regulatory authorities $ 11,000,000 $ 11,000,000
Fair value of securities pledged as collateral 1,600,000,000 1,900,000,000
Cash pledged as collateral under investment agreements 487,000,000 224,000,000
Gross unrealized losses, portfolio 500,000,000 849,000,000
Gross unrealized losses, available for sale securities 278,000,000 478,000,000
Rate of book value securities exceeded market value 5.00% 5.00%
Number of securities, unrealized loss position for continuous twelve-month period or longer 240 290
Weighted average contractual maturity period of securities, unrealized loss position, years 21 21
Fair value 2,092,000,000 2,387,000,000
Gross unrealized losses 278,000,000 478,000,000
Aggregate Unrealized Losses [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
12 months or longer, unrealized losses 467,000,000 782,000,000
Variable Interest Entity [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Carrying value of available-for-sale 856,000,000 432,000,000
Unrecognized gross losses 222,000,000 371,000,000
Unrecognized gross gains   17,000,000
Book Value Greater Than Market Value By More Than 5% [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Number of securities, unrealized loss position for continuous twelve-month period or longer 149 218
Asset-Backed Securities [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Investments rated AAA 20.00%  
Fair value 330,000,000  
Gross unrealized losses (125,000,000)  
Securities rated below investment grade without giving effect to the benefit of guarantees provided by financial guarantors 149,000,000  
Percentage of securities rated below investment grade without giving effect to the benefit of guarantees provided by financial guarantors 45.00%  
Asset-Backed Securities [Member] | MBIA Corp [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Benefit of guarantees provided 149,000,000  
Mortgage-Backed Securities [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Percentage of investments rated investment grade 63.00%  
Investments rated AAA 21.00%  
Fair value 360,000,000  
Gross unrealized losses 91,000,000  
Securities rated below investment grade without giving effect to the benefit of guarantees provided by financial guarantors 250,000,000  
Percentage of securities rated below investment grade without giving effect to the benefit of guarantees provided by financial guarantors 69.00%  
Mortgage-Backed Securities [Member] | MBIA Corp [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Benefit of guarantees provided 11,000,000  
Corporate Obligations [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Percentage of investments rated investment grade 95.00%  
Investments rated AAA 14.00%  
Fair value 495,000,000  
Gross unrealized losses 37,000,000  
Securities rated below investment grade without giving effect to the benefit of guarantees provided by financial guarantors 21,000,000  
Percentage of securities rated below investment grade without giving effect to the benefit of guarantees provided by financial guarantors 4.00%  
Corporate Obligations [Member] | MBIA Corp [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Benefit of guarantees provided 4,000,000  
3rd Party Guarantors [Member] | Asset-Backed Securities [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Benefit of guarantees provided 58,000,000  
3rd Party Guarantors [Member] | Mortgage-Backed Securities [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Benefit of guarantees provided 230,000,000  
3rd Party Guarantors [Member] | Corporate Obligations [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Benefit of guarantees provided 24,000,000  
Asset / Liability Products [Member] | Asset-Backed Securities [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Fair value 154,000,000  
Gross unrealized losses $ 77,000,000