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Stock Compensation Plans Level 4 Stock Compensation Plans (Details) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Stock based Compensation Plans        
Stock-based compensation plans expense   $ 98,000,000us-gaap_AllocatedShareBasedCompensationExpense $ 69,000,000us-gaap_AllocatedShareBasedCompensationExpense $ 95,000,000us-gaap_AllocatedShareBasedCompensationExpense
Income tax benefit   (34,000,000)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense (24,000,000)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense (33,000,000)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Total stock-based compensation plans expense, after-tax   64,000,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax 45,000,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax 62,000,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost 16,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost 11,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost    
Total compensation cost related to non-vested awards not yet recognized $ 86,000,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized $ 86,000,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized    
Weighted average period of compensation cost recognized (in years) 1 year 329 days      
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 12,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis
= hig_TheHartford2014IncentiveStockPlanISOPMember
12,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis
= hig_TheHartford2014IncentiveStockPlanISOPMember
   
The Hartford 2010 Incentive Stock Plan (ISOP) [Member]        
Stock Compensation Plans (Textual) [Abstract]        
Maximum limit of shares awarded 12,603,158us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis
= hig_TheHartford2010IncentiveStockPlanISOPMember
12,603,158us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis
= hig_TheHartford2010IncentiveStockPlanISOPMember