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Employee Benefit Plans Level 4 Assumptions (Details) - shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]        
Pre-65 health care cost trend rate   7.30% 7.70% 8.05%
Post-65 health care cost trend rate   5.50% 5.60% 5.70%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)   5.00% 5.00% 5.00%
Year that the rate reaches the ultimate trend rate   2023 2023 2021
Pension Benefits [Member]        
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]        
Discount rate   4.25% 4.00%  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Discount rate, net periodic benefit cost   4.00% 4.75% 4.00%
Expected long-term rate of return on plan assets   6.90% 7.10% 7.10%
Rate of increase in compensation levels   0.00% 0.00% 3.75%
Other Postretirement Benefits [Member]        
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]        
Discount rate   4.00% 3.75%  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Discount rate, net periodic benefit cost   3.75% 4.25% 3.50%
Expected long-term rate of return on plan assets   6.90% 7.10% 7.10%
Scenario, Forecast [Member] | Pension Benefits [Member]        
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Expected long-term rate of return on plan assets 6.70%      
Fixed Income Funds [Member]        
Defined Benefit Plan, Assumptions Used in Calculations [Abstract]        
Anticipated portion of fixed income securities in investment mix   60.00%    
Equity Securities [Member]        
Defined Benefit Plan, Assumptions Used in Calculations [Abstract]        
Anticipated portion of fixed income securities in investment mix   40.00%    
The Hartford 2010 Incentive Stock Plan (ISOP) [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized   12,086,260