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Debt (Details) - USD ($)
$ in Millions
Oct. 01, 2015
May. 01, 2015
Mar. 01, 2015
Total ACE INA debt issued in October 2015 [Member] | Subsequent Event [Member]      
Debt Instrument [Line Items]      
Face amount of debt $ 5,300    
Senior Notes [Member] | ACE INA Senior Notes Due March 2025 [Member]      
Debt Instrument [Line Items]      
Face amount of debt     $ 800
Interest Rate     3.15%
Make Whole Premium Additional Percent     0.15%
Senior Notes [Member] | ACE INA Senior Notes Due November 2020 [Member] | Subsequent Event [Member]      
Debt Instrument [Line Items]      
Face amount of debt $ 1,300    
Interest Rate 2.30%    
Make Whole Premium Additional Percent 0.15%    
Senior Notes [Member] | ACE INA Senior Notes Due November 2022 [Member] | Subsequent Event [Member]      
Debt Instrument [Line Items]      
Face amount of debt $ 1,000    
Interest Rate 2.875%    
Make Whole Premium Additional Percent 0.20%    
Senior Notes [Member] | ACE INA Senior Notes Due May 2026 [Member] | Subsequent Event [Member]      
Debt Instrument [Line Items]      
Face amount of debt $ 1,500    
Interest Rate 3.35%    
Make Whole Premium Additional Percent 0.20%    
Senior Notes [Member] | ACE INA Senior Notes Due November 2045 [Member] | Subsequent Event [Member]      
Debt Instrument [Line Items]      
Face amount of debt $ 1,500    
Interest Rate 4.35%    
Make Whole Premium Additional Percent 0.25%    
ACE INA Senior Notes Due May 2015 [Member]      
Debt Instrument [Line Items]      
Interest Rate   5.60%  
Current Maturities of Long-Term Deb   $ 450