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Equity Level 4 Stock Repurchase Program (Details) (USD $)
In Millions, except Share data, unless otherwise specified
1 Months Ended 12 Months Ended 1 Months Ended
Jul. 29, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Feb. 28, 2015
Class of Stock [Line Items]          
Stock Repurchase Program, Authorized Amount   $ 2,775us-gaap_StockRepurchaseProgramAuthorizedAmount1      
Stock Repurchase Program, Remaining Authorized Repurchase Amount   979us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1      
Stock Repurchase Program, Increase in Number of Shares Authorized to be Repurchased   1,525hig_StockRepurchaseProgramIncreaseinNumberofSharesAuthorizedtobeRepurchased      
Payments for Repurchase of Common Stock   1,796us-gaap_PaymentsForRepurchaseOfCommonStock 600us-gaap_PaymentsForRepurchaseOfCommonStock 154us-gaap_PaymentsForRepurchaseOfCommonStock  
Common stock repurchased, value $ 165us-gaap_TreasuryStockValueAcquiredCostMethod        
Class of Warrant or Right, Outstanding   7,200,000us-gaap_ClassOfWarrantOrRightOutstanding 32,400,000us-gaap_ClassOfWarrantOrRightOutstanding    
Common Stock, Dividends, Per Share, Declared   $ 0.66us-gaap_CommonStockDividendsPerShareDeclared $ 0.50us-gaap_CommonStockDividendsPerShareDeclared $ 0.40us-gaap_CommonStockDividendsPerShareDeclared  
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 9.388us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 $ 9.504us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 $ 9.599us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1  
Common Stock [Member]          
Class of Stock [Line Items]          
Treasury stock acquired   49,518,000us-gaap_TreasuryStockSharesAcquired
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
19,235,000us-gaap_TreasuryStockSharesAcquired
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
8,045,000us-gaap_TreasuryStockSharesAcquired
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
 
Subsequent Event [Member]          
Class of Stock [Line Items]          
Treasury stock acquired         4,100,000us-gaap_TreasuryStockSharesAcquired
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember