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Investments (Distribution By Contractual Maturity Of Available-For-Sale and Held-To-Maturity Investments) (Detail) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
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 901 $ 916
Fixed Maturities [Member]    
Available For Sale Securities [Abstract]    
Due in one year or less 667  
Due after one year through five years 1,038  
Due after five years through ten years 641  
Due after ten years 1,120  
Mortgage-Backed and Asset-Backed 731  
Total Available-For-Sale, amortized cost 4,197  
Due in one year or less 671  
Due after one year through five years 1,038  
Due after five years through ten years 562  
Due after ten years 1,151  
Mortgage-Backed and Asset-Backed 722  
Total Available-For-Sale, fair value 4,144  
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 901  
Mortgage-Backed and Asset-Backed 0  
Held-To-Maturity Securities Fair Value $ 901