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Investments (Distribution By Contractual Maturity Of Available-For-Sale and Held-To-Maturity Investments) (Detail) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Held To Maturity Securities [Abstract]    
Total Held-To-Maturity, amortized cost $ 2,707 $ 2,757
Total Held-To-Maturity, fair value 2,442 $ 2,632
Fixed Maturities [Member]    
Available For Sale Securities [Abstract]    
Due in one year or less 671  
Due after one year through five years 1,442  
Due after five years through ten years 923  
Due after ten years 1,545  
Mortgage-Backed and Asset-Backed 1,561  
Total Available-For-Sale, amortized cost 6,142  
Due in one year or less 672  
Due after one year through five years 1,460  
Due after five years through ten years 953  
Due after ten years 1,534  
Mortgage-Backed and Asset-Backed 1,540  
Total Available-For-Sale, fair value 6,159  
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 2,707  
Mortgage-Backed and Asset-Backed 0  
Total Held-To-Maturity, amortized cost 2,707  
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 2,442  
Mortgage-Backed and Asset-Backed 0  
Total Held-To-Maturity, fair value $ 2,442