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Investments (Distribution Of Contractual Maturity Available-For-Sale) (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]    
Fair Value $ 6,875 $ 8,810
Amortized Cost 6,729 9,025
Fixed-Maturity Investments [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Due in one year or less, Fair Value 830  
Due after one year through five years, Fair Value 872  
Due after five years through ten years, Fair Value 635  
Due after ten years through fifteen years, Fair Value 468  
Due after fifteen years, Fair Value 1,483  
Fair Value 5,809 7,336
Due in one year or less, Amortized Cost 828  
Due after one year through five years, Amortized Cost 844  
Due after five years through ten years, Amortized Cost 591  
Due after ten years through fifteen years, Amortized Cost 437  
Due after fifteen years, Amortized Cost 1,363  
Amortized Cost 5,644 7,492
Fixed-Maturity Investments [Member] | Mortgage-Backed Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 1,246  
Amortized Cost 1,221  
Fixed-Maturity Investments [Member] | Asset-Backed Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 275  
Amortized Cost 360  
Variable Interest Entity [Member] | Fixed-Maturity Investments [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Due in one year or less, Fair Value 7  
Due after one year through five years, Fair Value 132  
Due after five years through ten years, Fair Value     
Due after ten years through fifteen years, Fair Value 78  
Due after fifteen years, Fair Value     
Fair Value 427  
Due in one year or less, Amortized Cost 7  
Due after one year through five years, Amortized Cost 123  
Due after five years through ten years, Amortized Cost     
Due after ten years through fifteen years, Amortized Cost 84  
Due after fifteen years, Amortized Cost     
Amortized Cost 446  
Variable Interest Entity [Member] | Fixed-Maturity Investments [Member] | Mortgage-Backed Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 87  
Amortized Cost 99  
Variable Interest Entity [Member] | Fixed-Maturity Investments [Member] | Asset-Backed Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 123  
Amortized Cost $ 133