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Investments (Narrative) (Detail)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Security
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Security
Sep. 30, 2018
USD ($)
May 31, 2019
Dec. 31, 2018
USD ($)
Investment [Line Items]            
Equity Method Investment, Ownership Percentage 100.00%   100.00%      
Net unrealized appreciation (depreciation) included in OCI $ (21) $ (2) $ (5) $ (6)    
Unrealized appreciation(depreciation) portion of AOCI with OTTI included in AOCI $ (26)   $ (26)     $ 1
Percentage of mortgage-backed securities represented by investments in US government agency bonds 83.00%   83.00%     81.00%
Company Assumed Recovery Rate     32.00%      
Moodys Historical Mean Recovery Rate     42.00%      
Total number of fixed maturities | Security 31,075   31,075      
Number of fixed maturities in an unrealized loss position | Security 4,231   4,231      
Largest single unrealized loss in the fixed maturities $ 7   $ 7      
Restricted assets in fixed maturities and short-term investments 21,300   21,300     $ 21,000
Restricted assets in cash 111   111     $ 93
Operating Lease, Impairment Loss       22    
Corporate and foreign securities [Member]            
Investment [Line Items]            
Credit losses recognized in net income 18 8 32 9    
Mortgage-backed securities            
Investment [Line Items]            
Credit losses recognized in net income $ 0 0 $ 0 0    
Junior Subordinated Debt [Member] | Chubb INA Senior Notes Due 2037 [Member]            
Investment [Line Items]            
Gain (Loss) on Extinguishment of Debt       (36)    
Huatai Insurance Group [Member]            
Investment [Line Items]            
Equity Method Investment, Ownership Percentage 26.20%   26.20%   6.20%  
Payments to Acquire Other Investments     $ 329      
Junior Subordinated Debt [Member] | Chubb INA Capital Securities Due 2067 [Member]            
Investment [Line Items]            
Debt Instrument, Face Amount   $ 1,000   $ 1,000    
Debt Instrument, Interest Rate, Stated Percentage   6.375%   6.375%