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Debt (Schedule of Debt Outstanding) (Details)
€ in Millions, $ in Millions
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Mar. 31, 2018
EUR (€)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
EUR (€)
Mar. 31, 2000
USD ($)
Debt Instrument [Line Items]                
Repurchase agreements $ 1,418         $ 1,408    
Short-term debt 509         1,013    
Long-term debt 12,087         11,556    
Trust preferred securities 308         308    
Junior Subordinated Debt [Member] | Chubb INA Capital Securities Due 2067 [Member]                
Debt Instrument [Line Items]                
Long-term debt 0         964    
Debt Instrument, Face Amount     $ 1,000          
Long-term debt stated interest rate     6.375%          
Senior Notes                
Debt Instrument [Line Items]                
Long-term debt 12,087         11,556    
Senior Notes | INA Senior Notes Due March 2018 [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Face Amount       $ 300        
Long-term debt stated interest rate       5.80% 5.80%      
Senior Notes | INA Senior Notes Due May 2018 [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Face Amount     $ 600          
Long-term debt stated interest rate     5.75%          
Senior Notes | INA Senior Note Due August 2018 [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Face Amount   $ 100            
Long-term debt stated interest rate   6.60%            
Senior Notes | INA Senior Notes Due June 2019 [Member]                
Debt Instrument [Line Items]                
Long-term debt 0         499    
Debt Instrument, Face Amount $ 500              
Long-term debt stated interest rate 5.90%              
Make Whole Premium Additional Percent 0.40%              
Senior Notes | INA Senior Notes Due November 2020 [Member]                
Debt Instrument [Line Items]                
Long-term debt $ 1,297         1,296    
Debt Instrument, Face Amount $ 1,300              
Long-term debt stated interest rate 2.30%              
Make Whole Premium Additional Percent 0.15%              
Senior Notes | INA Senior Notes Due November 2022 [Member]                
Debt Instrument [Line Items]                
Long-term debt $ 996         995    
Debt Instrument, Face Amount $ 1,000              
Long-term debt stated interest rate 2.875%              
Make Whole Premium Additional Percent 0.20%              
Senior Notes | INA Senior Notes Due March 2023 [Member]                
Debt Instrument [Line Items]                
Long-term debt $ 473         472    
Debt Instrument, Face Amount $ 475              
Long-term debt stated interest rate 2.70%              
Make Whole Premium Additional Percent 0.10%              
Senior Notes | INA Senior Notes Due May 2024 [Member]                
Debt Instrument [Line Items]                
Long-term debt $ 696         695    
Debt Instrument, Face Amount $ 700              
Long-term debt stated interest rate 3.35%              
Make Whole Premium Additional Percent 0.15%              
Senior Notes | INA Senior Notes Due March 2025 [Member]                
Debt Instrument [Line Items]                
Long-term debt $ 796         795    
Debt Instrument, Face Amount $ 800              
Long-term debt stated interest rate 3.15%              
Make Whole Premium Additional Percent 0.15%              
Senior Notes | INA Senior Notes Due May 2026 [Member]                
Debt Instrument [Line Items]                
Long-term debt $ 1,491         1,489    
Debt Instrument, Face Amount $ 1,500              
Long-term debt stated interest rate 3.35%              
Make Whole Premium Additional Percent 0.20%              
Senior Notes | 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%              
Senior Notes | Chubb INA Senior Notes Due 2031 [Member]                
Debt Instrument [Line Items]                
Long-term debt $ 250         254    
Debt Instrument, Face Amount $ 200              
Long-term debt stated interest rate 6.80%              
Make Whole Premium Additional Percent 0.25%              
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%              
Make Whole Premium Additional Percent 0.20%              
Senior Notes | Chubb INA Senior Notes Due 2037 [Member]                
Debt Instrument [Line Items]                
Long-term debt $ 962         971    
Debt Instrument, Face Amount $ 800              
Long-term debt stated interest rate 6.00%              
Make Whole Premium Additional Percent 0.20%              
Senior Notes | Chubb INA Senior Notes Due 2038 [Member]                
Debt Instrument [Line Items]                
Long-term debt $ 759         768    
Debt Instrument, Face Amount $ 600              
Long-term debt stated interest rate 6.50%              
Make Whole Premium Additional Percent 0.30%              
Senior Notes | INA Senior Note Due March 2028 [Member]                
Debt Instrument [Line Items]                
Long-term debt $ 1,008         0 € 0  
Debt Instrument, Face Amount       $ 1,100 € 900      
Long-term debt stated interest rate       1.55% 1.55%      
Make Whole Premium Additional Percent       0.15% 0.15%      
Senior Notes | INA Senior Notes Due March 2043 [Member]                
Debt Instrument [Line Items]                
Long-term debt 470         469    
Debt Instrument, Face Amount $ 475              
Long-term debt stated interest rate 4.15%              
Make Whole Premium Additional Percent 0.15%              
Senior Notes | INA Senior Note Due March 2038 [Member]                
Debt Instrument [Line Items]                
Long-term debt $ 1,008         0 € 0  
Debt Instrument, Face Amount       $ 1,100 € 900      
Long-term debt stated interest rate       2.50% 2.50%      
Make Whole Premium Additional Percent       0.25% 0.25%      
Senior Notes | INA Senior Notes Due November 2045 [Member]                
Debt Instrument [Line Items]                
Long-term debt 1,483         1,482    
Debt Instrument, Face Amount $ 1,500              
Long-term debt stated interest rate 4.35%              
Make Whole Premium Additional Percent 0.25%              
Senior Notes | Other                
Debt Instrument [Line Items]                
Long-term debt $ 1         10    
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 $ 1,418         $ 1,408    
Weighted average interest rate on short-term debt 2.50%         1.50% 1.50%  
Senior Notes | INA Senior Notes Due March 2018 [Member]                
Debt Instrument [Line Items]                
Short-term debt $ 0         $ 300    
Debt Instrument, Face Amount $ 300              
Long-term debt stated interest rate 5.80%              
Make Whole Premium Additional Percent 0.35%              
Senior Notes | INA Senior Notes Due May 2018 [Member]                
Debt Instrument [Line Items]                
Short-term debt $ 0         610    
Debt Instrument, Face Amount $ 600              
Long-term debt stated interest rate 5.75%              
Make Whole Premium Additional Percent 0.30%              
Senior Notes | INA Senior Note Due August 2018 [Member]                
Debt Instrument [Line Items]                
Short-term debt $ 0         103    
Debt Instrument, Face Amount $ 100              
Long-term debt stated interest rate 6.60%              
Make Whole Premium Additional Percent 0.00%              
Senior Notes | INA Senior Note Due June 2019 [Member]                
Debt Instrument [Line Items]                
Short-term debt $ 500         0    
Debt Instrument, Face Amount $ 500              
Long-term debt stated interest rate 5.90%              
Make Whole Premium Additional Percent 0.40%              
Senior Notes | INA Senior Note Due December 2019 [Member]                
Debt Instrument [Line Items]                
Short-term debt $ 9         $ 0    
Long-term debt stated interest rate 7.10%              
Minimum | Junior Subordinated Debt [Member] | Chubb INA Capital Securities Due 2067 [Member]                
Debt Instrument [Line Items]                
Make Whole Premium Additional Percent 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]                
Make Whole Premium Additional Percent 0.50%              
Maximum | Senior Notes | Other                
Debt Instrument [Line Items]                
Long-term debt stated interest rate 7.10%