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Investments in fixed maturity securities - Amortized cost and estimated fair value of securities with fixed maturities (Detail) (Fixed Maturities [Member], USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Summary of Investment Holdings [Line Items]    
Due in one year or less - amortized cost $ 6,795  
Due after one year through five years - amortized cost 13,800  
Due after five years through ten years - amortized cost 3,982  
Due after ten years - amortized cost 2,303  
Total - amortized cost 29,359  
Due in one year or less - fair value 6,952  
Due after one year through five years - fair value 14,536  
Due after five years through ten years - fair value 4,633  
Due after ten years - fair value 2,770  
Fair Value of Investments 31,698 32,188
Mortgage-backed securities [Member]
   
Summary of Investment Holdings [Line Items]    
Fair Value of Investments 2,807 2,892
Mortgage-backed securities - amortized cost 2,479  
Mortgage-backed securities - fair value $ 2,807