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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Jun. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Tax Reconciliation [Line Items]          
Statutory rate of income taxes 35.00% 35.00%   35.00% 35.00%
Current year catastrophe losses       $ 2,237 $ 2,011
Effective tax rate excluding the catastrophe losses within subsidiaries 22.00%        
Effective tax rate excluding the charge related to the exit of certain lines of business within subsidiaries   36.00%     36.00%
Operating loss carryforwards $ 13     $ 13  
Other lines | Property and Casualty Insurance          
Income Tax Reconciliation [Line Items]          
Special charges related to the exit of certain lines of business within subsidiaries     $ 65    
Other lines | Neon Capital Limited | Property and Casualty Insurance          
Income Tax Reconciliation [Line Items]          
Special charges related to the exit of certain lines of business within subsidiaries   $ 65      
Hurricanes and Earthquakes | Neon Capital Limited          
Income Tax Reconciliation [Line Items]          
Current year catastrophe losses $ 53