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Equity Level 4 Dividends from Insurance Subsidiaries (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Feb. 22, 2017
Class of Stock [Line Items]      
Percent Available for Dividend Distribution without Prior Approval from Regulatory Agency   10.00%  
Dividend Payment Restrictions Schedule, Description   There are no current restrictions on the HFSG Holding Company's ability to pay dividends to its shareholders.  
Restricted net assets   $ 16,000  
Hartford Life Inc [Domain]      
Class of Stock [Line Items]      
Statutory Accounting Practices, Dividends Paid with Approval of Regulatory Agency   1,000  
Scenario, Forecast [Member] | Property and Casualty Insurance Subsidiaries [Member]      
Class of Stock [Line Items]      
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval     $ 1,500
Scenario, Forecast [Member] | Hartford Life and Accident Insurance Company [Member]      
Class of Stock [Line Items]      
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval     207
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments with Regulatory Approval     250
Scenario, Forecast [Member] | Hartford Life Insurance Company [Member]      
Class of Stock [Line Items]      
Statutory Accounting Practices, Dividends Paid with Approval of Regulatory Agency $ 300    
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval     1,000
Subsequent Event [Member] | Hartford Life Insurance Company [Member] | Subsidiaries [Member]      
Class of Stock [Line Items]      
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval     300
Consolidated Property and Casualty Insurance Entity [Member]      
Class of Stock [Line Items]      
Statutory Accounting Practices, Dividends Paid with Approval of Regulatory Agency   440  
Consolidated Property and Casualty Insurance Entity [Member] | Subsidiaries [Member]      
Class of Stock [Line Items]      
Statutory Accounting Practices, Dividends Paid with Approval of Regulatory Agency   $ 1,200  
Consolidated Property and Casualty Insurance Entity [Member] | Scenario, Forecast [Member]      
Class of Stock [Line Items]      
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval     $ 850