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Investments (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Fair value of securities on deposit with various regulatory authorities $ 11 $ 11  
Fair value of securities pledged as collateral 1,900 2,400  
Unrecognized gross gains 17    
Gross unrealized losses, portfolio 849 1,100  
Percentage of book value securities exceeded market value 5.00% 5.00%  
Number of securities, unrealized loss position for continuous 12-month period or longer 290 412  
Weighted average contractual maturity period of securities, years, unrealized loss position 21 20  
Fair value 2,387 6,954  
Total, Unrealized losses 478 804  
Aggregate Unrealized Losses [Member]
     
Schedule of Trading Securities and Other Trading Assets [Line Items]      
12 months or longer, unrealized losses 782 941  
Non Variable Interest Entities [Member]
     
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Other-than-temporary impairments 101 64 361
Variable Interest Entities [Member]
     
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Unrecognized gross losses 371 279  
Other-than-temporary impairments     106
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 12-month period or longer 218 321  
Asset-Backed Securities [Member]
     
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Percentage of investments rated investment grade 54.00%    
Investment grade rated with AAA 12.00%    
Fair value 639    
Total, Unrealized losses 215    
Securities rated below investment grade without giving effect to the benefit of guarantees provided by financial guarantors 258    
Securities rated below investment grade percentage without giving effect to the benefit of guarantees provided by financial guarantors 40.00%    
Asset-Backed Securities [Member] | MBIA Corp. [Member]
     
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Fair value 338 [1]    
Total, Unrealized losses 78 [1]    
Benefit of Guarantees Provided 338    
Mortgage-Backed Securities [Member]
     
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Percentage of investments rated investment grade 65.00%    
Investment grade rated with AAA 23.00%    
Fair value 401    
Total, Unrealized losses 119    
Securities rated below investment grade without giving effect to the benefit of guarantees provided by financial guarantors 262    
Securities rated below investment grade percentage without giving effect to the benefit of guarantees provided by financial guarantors 65.00%    
Mortgage-Backed Securities [Member] | MBIA Corp. [Member]
     
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Fair value 18 [1]    
Total, Unrealized losses 5 [1]    
Benefit of Guarantees Provided 18    
Corporate Obligations [Member]
     
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Percentage of investments rated investment grade 80.00%    
Investment grade rated with AAA 10.00%    
Fair value 717    
Total, Unrealized losses 106    
Securities rated below investment grade without giving effect to the benefit of guarantees provided by financial guarantors 33    
Securities rated below investment grade percentage without giving effect to the benefit of guarantees provided by financial guarantors 5.00%    
Corporate Obligations [Member] | MBIA Corp. [Member]
     
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Fair value 97 [1]    
Total, Unrealized losses 17 [1]    
Securities Pledged as Collateral [Member]
     
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Money market securities pledged as collateral under investment agreements 224 113  
3rd Party Guarantors [Member] | Asset-Backed Securities [Member]
     
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Benefit of Guarantees Provided 111    
3rd Party Guarantors [Member] | Mortgage-Backed Securities [Member]
     
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Benefit of Guarantees Provided 239    
3rd Party Guarantors [Member] | Corporate Obligations [Member]
     
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Benefit of Guarantees Provided 74    
National [Member] | Corporate Obligations [Member]
     
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Benefit of Guarantees Provided 97    
Asset/Liability Products [Member]
     
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Other-than-temporary impairments 31 59 352
Asset/Liability Products [Member] | Asset-Backed Securities [Member]
     
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Fair value 397    
Total, Unrealized losses $ 120    
[1] Includes investments insured by MBIA Corp. and National.