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Investments (Narrative) (Detail)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Security
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Security
Jun. 30, 2014
USD ($)
Apr. 30, 2015
USD ($)
Apr. 14, 2015
USD ($)
Mar. 27, 2015
USD ($)
Dec. 31, 2014
USD ($)
Investment [Line Items]                
Total number of fixed maturities | Security 26,933   26,933          
Largest single unrealized loss in the fixed maturities $ 5   $ 5          
Number of equity securities in an unrealized loss position | Security 99   99          
Total number of equity securities | Security 271   271          
Largest single unrealized loss in the equity securities $ 1   $ 1          
Restricted assets in fixed maturities and short-term investments 16,500   16,500         $ 16,300
Restricted assets in cash 80   $ 80         117
Moodys Historical Mean Recovery Rate     42.00%          
Company Assumed Recovery Rate     32.00%          
Net unrealized depreciation included in AOCI 7   $ 7         3
Fair value of securities transferred from AFS to HTM         $ 1,900      
Investments in partially-owned insurance companies 638   638         $ 504
Net unrealized appreciation (depreciation) included in OCI $ 0 $ 1 $ 4 $ 5        
Number of fixed maturities in an unrealized loss position | Security 7,253   7,253          
Credit losses recognized in net income for mortgage-backed securities $ 0 0 $ 0 0        
Credit losses recognized in net income for corporate securities $ 5 $ 6 $ 9 $ 10        
Percentage of mortgage-backed securities represented by investments in US government agency bonds 80.00%   80.00%         83.00%
Reinsurance recoverable on losses and loss expenses $ 11,775   $ 11,775         $ 11,992
Insurance and reinsurance balances payable 4,602   4,602         4,095
Unearned premiums 8,879   8,879         $ 8,222
ABR Reinsurance Capital Holdings Ltd. [Member]                
Investment [Line Items]                
Equity Method Investment, Ownership Percentage           11.30%    
Investments in partially-owned insurance companies           $ 20 $ 70  
Warrants & Rights Outstanding             0.50%  
Ceded Premiums Written 35   35          
Ceded Commissions 11   11          
Reinsurance recoverable on losses and loss expenses 5   5          
Insurance and reinsurance balances payable $ 18   $ 18