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Investments (Distribution By Contractual Maturity Of Available-For-Sale and Held-To-Maturity Investments) (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Available For Sale Securities [Abstract]    
Total Available-For-Sale, Amortized Cost $ 6,443 $ 6,122
Total available-for-sale, fair value 6,377 6,221
Held To Maturity Securities [Abstract]    
Total Held-To-Maturity, Amortized Cost 2,809 2,829
Total held-to- maturity, fair value 2,566 2,674
Fixed Maturities [Member]
    
Available For Sale Securities [Abstract]    
Due in one year or less 551  
Due after one year through five years 913  
Due after five years through ten years 926  
Due after ten years 1,576  
Mortgage-Backed and Asset-Backed 1,401  
Total Available-For-Sale, Amortized Cost 5,367 4,883
Due in one year or less 552  
Due after one year through five years 929  
Due after five years through ten years 925  
Due after ten years 1,564  
Mortgage-Backed and Asset-Backed 1,330  
Total available-for-sale, fair value 5,300 4,993
Fixed Maturities [Member] | Variable Interest Entity Primary Beneficiary [Member]
    
Held To Maturity Securities [Abstract]    
Due in one year or less 0  
Due after one year through five years 0  
Due after five years through ten years 0  
Due after ten years 2,809  
Mortgage-Backed and Asset-Backed 0  
Total Held-To-Maturity, Amortized Cost 2,809  
Due in one year or less 0  
Due after one year through five years 0  
Due after five years through ten years 0  
Due after ten years 2,566  
Mortgage-Backed and Asset-Backed 0  
Total held-to- maturity, fair value $ 2,566