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Investments (Distribution By Contractual Maturity Of Available-For-Sale and Held-To-Maturity Investments) (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Variable Interest Entity Primary Beneficiary [Member]    
Held To Maturity Securities [Abstract]    
Total held-to-maturity, amortized cost $ 890 $ 890
Held-To-Maturity Securities Fair Value 916 $ 876
Fixed Maturities [Member]    
Available For Sale Securities [Abstract]    
Due in one year or less 674  
Due after one year through five years 1,157  
Due after five years through ten years 601  
Due after ten years 1,067  
Mortgage-Backed and Asset-Backed 757  
Total Available-For-Sale, amortized cost 4,256  
Due in one year or less 674  
Due after one year through five years 1,159  
Due after five years through ten years 540  
Due after ten years 1,116  
Mortgage-Backed and Asset-Backed 751  
Total Available-For-Sale, fair value 4,240  
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 916  
Mortgage-Backed and Asset-Backed 0  
Held-To-Maturity Securities Fair Value $ 916