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Stock Compensation Plans Level 4 Stock Compensation Plans (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2015
Jun. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stock based Compensation Plans          
Stock-based compensation plans expense     $ 78 $ 98 $ 69
Income tax benefit     (27) (34) (24)
Total stock-based compensation plans expense, after-tax     51 64 $ 45
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost   $ 11   $ 16  
Total compensation cost related to non-vested awards not yet recognized $ 90   $ 90    
Weighted average period of compensation cost recognized (in years) 1 year 10 months        
Stock Compensation Plans (Textual) [Abstract]          
Period commencing from date of grant     3 years    
The Hartford 2014 Incentive Stock Plan (ISOP) [Member]          
Stock Compensation Plans (Textual) [Abstract]          
Maximum limit of shares awarded 12,000,000   12,000,000    
The Hartford 2010 Incentive Stock Plan (ISOP) [Member]          
Stock Compensation Plans (Textual) [Abstract]          
Maximum limit of shares awarded 12,086,260   12,086,260