XML 51 R40.htm IDEA: XBRL DOCUMENT v3.5.0.2
Investments (Narrative) (Detail)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Security
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Security
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Investment [Line Items]          
Total number of fixed maturities | Security 31,902   31,902    
Number of equity securities in an unrealized loss position | Security 73   73    
Total number of equity securities | Security 326   326    
Largest single unrealized loss in the equity securities $ (3)   $ (3)    
Restricted assets in fixed maturities and short-term investments 19,400   19,400   $ 16,900
Restricted assets in cash 162   $ 162   110
Moodys Historical Mean Recovery Rate     42.00%    
Company Assumed Recovery Rate     32.00%    
Net unrealized appreciation (depreciation) included in OCI 13 $ (4) $ 57 $ 0  
Unrealized appreciation (depreciation) portion of AOCI with OTTI included in AOCI $ 7   $ 7   $ (35)
Number of fixed maturities in an unrealized loss position | Security 3,376   3,376    
Percentage of mortgage-backed securities represented by investments in US government agency bonds 81.00%   81.00%   81.00%
Largest single unrealized loss in the fixed maturities $ (2)   $ (2)    
Corporate [Member]          
Investment [Line Items]          
Credit losses recognized in net income 4 14 28 23  
Collateralized Mortgage Backed Securities [Member]          
Investment [Line Items]          
Credit losses recognized in net income $ 1 $ 0 $ 1 $ 0