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Debt (Schedule of Debt Outstanding) (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Jan. 14, 2016
Dec. 31, 2015
Debt Instrument [Line Items]      
Repurchase Agreements $ 1,405   $ 1,404
Short-term debt 500   0
Long-term debt 12,631   9,389
Trust preferred securities 308   307
Chubb INA Capital Securities Due 2067 [Member]      
Debt Instrument [Line Items]      
Face amount of debt 1,000    
Senior Notes [Member]      
Debt Instrument [Line Items]      
Long-term debt 12,631   9,389
Senior Notes [Member] | INA Senior Notes Due February 2017 [Member]      
Debt Instrument [Line Items]      
Face amount of debt 500    
Short-term debt $ 500   0
Interest Rate 5.70%    
Long-term debt $ 0   500
Make Whole Premium Additional Percent 0.20%    
Senior Notes [Member] | INA Senior Notes Due March 2018 [Member]      
Debt Instrument [Line Items]      
Face amount of debt $ 300    
Interest Rate 5.80%    
Long-term debt $ 300   299
Make Whole Premium Additional Percent 0.35%    
Senior Notes [Member] | Chubb INA Senior Notes Due May 2018 [Member]      
Debt Instrument [Line Items]      
Face amount of debt $ 600    
Interest Rate 5.75%    
Long-term debt $ 648   0
Make Whole Premium Additional Percent 0.30%    
Senior Notes [Member] | INA Senior Notes Due June 2019 [Member]      
Debt Instrument [Line Items]      
Face amount of debt $ 500    
Interest Rate 5.90%    
Long-term debt $ 497   497
Make Whole Premium Additional Percent 0.40%    
Senior Notes [Member] | INA Senior Notes Due November 2020 [Member]      
Debt Instrument [Line Items]      
Face amount of debt $ 1,300    
Interest Rate 2.30%    
Long-term debt $ 1,294   1,294
Make Whole Premium Additional Percent 0.15%    
Senior Notes [Member] | INA Senior Notes Due November 2022 [Member]      
Debt Instrument [Line Items]      
Face amount of debt $ 1,000    
Interest Rate 2.875%    
Long-term debt $ 994   994
Make Whole Premium Additional Percent 0.20%    
Senior Notes [Member] | INA Senior Notes Due March 2023 [Member]      
Debt Instrument [Line Items]      
Face amount of debt $ 475    
Interest Rate 2.70%    
Long-term debt $ 471   471
Make Whole Premium Additional Percent 0.10%    
Senior Notes [Member] | INA Senior Notes Due May 2024 [Member]      
Debt Instrument [Line Items]      
Face amount of debt $ 700    
Interest Rate 3.35%    
Long-term debt $ 694   694
Make Whole Premium Additional Percent 0.15%    
Senior Notes [Member] | INA Senior Notes Due March 2025 [Member]      
Debt Instrument [Line Items]      
Face amount of debt $ 800    
Interest Rate 3.15%    
Long-term debt $ 794   794
Make Whole Premium Additional Percent 0.15%    
Senior Notes [Member] | INA Senior Notes Due May 2026 [Member]      
Debt Instrument [Line Items]      
Face amount of debt $ 1,500    
Interest Rate 3.35%    
Long-term debt $ 1,487   1,487
Make Whole Premium Additional Percent 0.20%    
Senior Notes [Member] | INA Senior Notes Due May 2036 [Member]      
Debt Instrument [Line Items]      
Face amount of debt $ 300    
Interest Rate 6.70%    
Long-term debt $ 297   297
Make Whole Premium Additional Percent 0.20%    
Senior Notes [Member] | Chubb INA Senior Notes Due 2037 [Member]      
Debt Instrument [Line Items]      
Face amount of debt $ 800    
Interest Rate 6.00%    
Long-term debt $ 984   0
Make Whole Premium Additional Percent 0.20%    
Senior Notes [Member] | Chubb INA Senior Notes Due 2038 [Member]      
Debt Instrument [Line Items]      
Face amount of debt $ 600    
Interest Rate 6.50%    
Long-term debt $ 780   0
Make Whole Premium Additional Percent 0.30%    
Senior Notes [Member] | INA Senior Notes Due March 2043 [Member]      
Debt Instrument [Line Items]      
Face amount of debt $ 475    
Interest Rate 4.15%    
Long-term debt $ 469   469
Make Whole Premium Additional Percent 0.15%    
Senior Notes [Member] | INA Senior Notes Due November 2045 [Member]      
Debt Instrument [Line Items]      
Face amount of debt $ 1,500    
Interest Rate 4.35%    
Long-term debt $ 1,482   1,482
Make Whole Premium Additional Percent 0.25%    
Senior Notes [Member] | Pennsylvania Industrial Development Authority (PIDA) AND City Of Philadelphia Urban Development Action Grant [Member]      
Debt Instrument [Line Items]      
Long-term debt $ 11   11
Junior Subordinated Debt [Member] | Chubb INA Capital Securities Due 2067 [Member]      
Debt Instrument [Line Items]      
Face amount of debt $ 1,000    
Interest Rate 6.375%    
Long-term debt $ 961   0
Debentures Subject to Mandatory Redemption [Member] | Chubb INA Senior Notes Due August 2018 [Member]      
Debt Instrument [Line Items]      
Face amount of debt $ 100    
Interest Rate 6.60%    
Long-term debt $ 109    
Debentures Subject to Mandatory Redemption [Member] | INA Senior Notes Due August 2029 [Member]      
Debt Instrument [Line Items]      
Face amount of debt $ 100    
Interest Rate 8.875%    
Long-term debt $ 100   100
Unsecured Debt [Member] | Chubb INA Senior Notes Due 2031 [Member]      
Debt Instrument [Line Items]      
Face amount of debt $ 200    
Interest Rate 6.80%    
Long-term debt $ 259   0
Make Whole Premium Additional Percent 0.25%    
Trust Preferred Securities [Member] | INA Capital Securities Due April 2030 [Member]      
Debt Instrument [Line Items]      
Trust preferred securities $ 308   307
Repurchase Agreements [Member]      
Debt Instrument [Line Items]      
Repurchase Agreements $ 1,405   $ 1,404
Short-term Debt, Weighted Average Interest Rate 0.80%   0.60%
Minimum [Member] | Senior Notes [Member] | Pennsylvania Industrial Development Authority (PIDA) AND City Of Philadelphia Urban Development Action Grant [Member]      
Debt Instrument [Line Items]      
Interest Rate 2.75%    
Minimum [Member] | Junior Subordinated Debt [Member] | Chubb INA Capital Securities Due 2067 [Member]      
Debt Instrument [Line Items]      
Make Whole Premium Additional Percent 0.25%    
Maximum [Member] | Senior Notes [Member] | Pennsylvania Industrial Development Authority (PIDA) AND City Of Philadelphia Urban Development Action Grant [Member]      
Debt Instrument [Line Items]      
Interest Rate 7.10%    
Maximum [Member] | Junior Subordinated Debt [Member] | Chubb INA Capital Securities Due 2067 [Member]      
Debt Instrument [Line Items]      
Make Whole Premium Additional Percent 0.50%    
The Chubb Corporation [Member]      
Debt Instrument [Line Items]      
Face amount of debt   $ 3,300  
Long-term debt   $ 3,765  
The Chubb Corporation [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Interest Rate   2.30%  
The Chubb Corporation [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Interest Rate   4.35%