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Debt (Schedule of Debt Outstanding) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Apr. 14, 2017
Dec. 31, 2016
Mar. 31, 2000
Debt Instrument [Line Items]        
Repurchase agreements $ 1,408   $ 1,403  
Short-term debt 1,013   500  
Long-term debt 11,556   12,610  
Trust preferred securities 308   308  
Chubb INA Capital Securities Due 2067 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount 1,000      
Junior Subordinated Debt [Member] | Chubb INA Capital Securities Due 2067 [Member]        
Debt Instrument [Line Items]        
Long-term debt 964   962  
Debt Instrument, Face Amount $ 1,000      
Long-term debt stated interest rate 3.97% 6.375%    
Senior Notes        
Debt Instrument [Line Items]        
Long-term debt $ 11,556   12,610  
Senior Notes | INA Senior Notes Due February 2017 [Member]        
Debt Instrument [Line Items]        
Short-term debt 0   500  
Long-term debt 0   0  
Debt Instrument, Face Amount $ 500      
Long-term debt stated interest rate 5.70%      
Additional percentage on 'make-whole' premium 0.20%      
Senior Notes | INA Senior Notes Due March 2018 [Member]        
Debt Instrument [Line Items]        
Short-term debt $ 300   0  
Long-term debt 0   300  
Debt Instrument, Face Amount $ 300      
Long-term debt stated interest rate 5.80%      
Additional percentage on 'make-whole' premium 0.35%      
Senior Notes | INA Senior Notes Due May 2018 [Member]        
Debt Instrument [Line Items]        
Short-term debt $ 610   0  
Senior Notes | Chubb INA Senior Notes Due 2018 [Member]        
Debt Instrument [Line Items]        
Long-term debt 0   635  
Debt Instrument, Face Amount $ 600      
Long-term debt stated interest rate 5.75%      
Additional percentage on 'make-whole' premium 0.30%      
Senior Notes | Chubb INA Senior Notes Due August 2018 [Member]        
Debt Instrument [Line Items]        
Short-term debt $ 103   0  
Senior Notes | INA Senior Notes Due June 2019 [Member]        
Debt Instrument [Line Items]        
Long-term debt 499   498  
Debt Instrument, Face Amount $ 500      
Long-term debt stated interest rate 5.90%      
Additional percentage on 'make-whole' premium 0.40%      
Senior Notes | INA Senior Notes Due November 2020 [Member]        
Debt Instrument [Line Items]        
Long-term debt $ 1,296   1,294  
Debt Instrument, Face Amount $ 1,300      
Long-term debt stated interest rate 2.30%      
Additional percentage on 'make-whole' premium 0.15%      
Senior Notes | INA Senior Notes Due November 2022 [Member]        
Debt Instrument [Line Items]        
Long-term debt $ 995   994  
Debt Instrument, Face Amount $ 1,000      
Long-term debt stated interest rate 2.875%      
Additional percentage on 'make-whole' premium 0.20%      
Senior Notes | INA Senior Notes Due March 2023 [Member]        
Debt Instrument [Line Items]        
Long-term debt $ 472   471  
Debt Instrument, Face Amount $ 475      
Long-term debt stated interest rate 2.70%      
Additional percentage on 'make-whole' premium 0.10%      
Senior Notes | INA Senior Notes Due May 2024 [Member]        
Debt Instrument [Line Items]        
Long-term debt $ 695   695  
Debt Instrument, Face Amount $ 700      
Long-term debt stated interest rate 3.35%      
Additional percentage on 'make-whole' premium 0.15%      
Senior Notes | INA Senior Notes Due March 2025 [Member]        
Debt Instrument [Line Items]        
Long-term debt $ 795   794  
Debt Instrument, Face Amount $ 800      
Long-term debt stated interest rate 3.15%      
Additional percentage on 'make-whole' premium 0.15%      
Senior Notes | INA Senior Notes Due May 2026 [Member]        
Debt Instrument [Line Items]        
Long-term debt $ 1,489   1,488  
Debt Instrument, Face Amount $ 1,500      
Long-term debt stated interest rate 3.35%      
Additional percentage on 'make-whole' premium 0.20%      
Senior Notes | INA Senior Notes Due May 2036 [Member]        
Debt Instrument [Line Items]        
Long-term debt $ 297   297  
Debt Instrument, Face Amount $ 300      
Long-term debt stated interest rate 6.70%      
Additional percentage on 'make-whole' premium 0.20%      
Senior Notes | Chubb INA Senior Notes Due 2037 [Member]        
Debt Instrument [Line Items]        
Long-term debt $ 971   980  
Debt Instrument, Face Amount $ 800      
Long-term debt stated interest rate 6.00%      
Additional percentage on 'make-whole' premium 0.20%      
Senior Notes | Chubb INA Senior Notes Due 2038 [Member]        
Debt Instrument [Line Items]        
Long-term debt $ 768   776  
Debt Instrument, Face Amount $ 600      
Long-term debt stated interest rate 6.50%      
Additional percentage on 'make-whole' premium 0.30%      
Senior Notes | INA Senior Notes Due March 2043 [Member]        
Debt Instrument [Line Items]        
Long-term debt $ 469   469  
Debt Instrument, Face Amount $ 475      
Long-term debt stated interest rate 4.15%      
Additional percentage on 'make-whole' premium 0.15%      
Senior Notes | INA Senior Notes Due November 2045 [Member]        
Debt Instrument [Line Items]        
Long-term debt $ 1,482   1,482  
Debt Instrument, Face Amount $ 1,500      
Long-term debt stated interest rate 4.35%      
Additional percentage on 'make-whole' premium 0.25%      
Senior Notes | Other        
Debt Instrument [Line Items]        
Long-term debt $ 10   11  
Senior secured debentures | Chubb INA Senior Notes Due August 2018 [Member]        
Debt Instrument [Line Items]        
Long-term debt 0   107  
Debt Instrument, Face Amount $ 100      
Long-term debt stated interest rate 6.60%      
Senior secured debentures | INA Senior Notes Due August 2029 [Member]        
Debt Instrument [Line Items]        
Long-term debt $ 100   100  
Debt Instrument, Face Amount $ 100      
Long-term debt stated interest rate 8.875%      
Unsecured Debt [Member] | Chubb INA Senior Notes Due 2031 [Member]        
Debt Instrument [Line Items]        
Long-term debt $ 254   257  
Debt Instrument, Face Amount $ 200      
Long-term debt stated interest rate 6.80%      
Additional percentage on 'make-whole' premium 0.25%      
Trust Preferred Securities | INA capital securities due 2030        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 309     $ 300
Trust preferred securities $ 308   308  
Long-term debt stated interest rate 9.70%     9.70%
Repurchase agreements        
Debt Instrument [Line Items]        
Short-term debt $ 1,408   $ 1,403  
Weighted average interest rate on short-term debt 1.50%   0.80%  
Minimum | Junior Subordinated Debt [Member] | Chubb INA Capital Securities Due 2067 [Member]        
Debt Instrument [Line Items]        
Additional percentage on 'make-whole' premium 0.25%      
Minimum | Senior Notes | Other        
Debt Instrument [Line Items]        
Long-term debt stated interest rate 2.75%      
Maximum | Junior Subordinated Debt [Member] | Chubb INA Capital Securities Due 2067 [Member]        
Debt Instrument [Line Items]        
Additional percentage on 'make-whole' premium 0.50%      
Maximum | Senior Notes | Other        
Debt Instrument [Line Items]        
Long-term debt stated interest rate 7.10%