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Investments (Distribution By Contractual Maturity Of Available-For-Sale and Held-To-Maturity Investments) (Detail) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Variable Interest Entity Primary Beneficiary [Member]    
Held To Maturity Securities [Abstract]    
Total Held-To-Maturity, amortized cost $ 890 $ 2,689
Total Held-To-Maturity, fair value 509 $ 2,401
Fixed Maturities [Member]    
Available For Sale Securities [Abstract]    
Due in one year or less 447  
Due after one year through five years 1,642  
Due after five years through ten years 844  
Due after ten years 1,464  
Mortgage-Backed and Asset-Backed 1,462  
Total Available-For-Sale, amortized cost 5,859  
Due in one year or less 447  
Due after one year through five years 1,677  
Due after five years through ten years 903  
Due after ten years 1,558  
Mortgage-Backed and Asset-Backed 1,459  
Total Available-For-Sale, fair value 6,044  
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 890  
Mortgage-Backed and Asset-Backed 0  
Total Held-To-Maturity, amortized cost 890  
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 509  
Mortgage-Backed and Asset-Backed 0  
Total Held-To-Maturity, fair value $ 509