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Equity Level 4 Statutory Net Income (Loss) and Statutory Surplus (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Feb. 22, 2017
Statutory Accounting Practices [Line Items]          
Payments of Ordinary Dividends, Common Stock   $ 334 $ 316 $ 282  
Statutory Net Income (Loss)          
Statutory Net Income (Loss)   861 2,025 1,643  
Statutory surplus          
Statutory Capital and surplus   $ 14,283 $ 15,154    
Statutory Accounting Practices, Risk Based Capital Requirements Compliance Assertion   All of the Company's operating insurance subsidiaries had RBC ratios in excess of the minimum levels required by the applicable insurance regulations. On an aggregate basis, the Company's U.S. property and casualty insurance companies' RBC ratio was in excess of 200% of its Company Action Level as of December 31, 2016 and 2015. The RBC ratios for the Company's principal life insurance operating subsidiaries were all in excess of 400% of their Company Action Levels as of December 31, 2016 and 2015 All of the Company's operating insurance subsidiaries had RBC ratios in excess of the minimum levels required by the applicable insurance regulations. On an aggregate basis, the Company's U.S. property and casualty insurance companies' RBC ratio was in excess of 200% of its Company Action Level as of December 31, 2016 and 2015. The RBC ratios for the Company's principal life insurance operating subsidiaries were all in excess of 400% of their Company Action Levels as of December 31, 2015.    
Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries   $ 16,000      
U.S. life insurance subsidiaries, includes domestic captive insurance subsidiaries          
Statutory Net Income (Loss)          
Statutory Net Income (Loss)   557 $ 539 415  
Statutory surplus          
Statutory Capital and surplus   6,022 6,591    
Property and casualty insurance subsidiaries          
Statutory Net Income (Loss)          
Statutory Net Income (Loss)   304 1,486 $ 1,228  
Statutory surplus          
Statutory Capital and surplus   $ 8,261 $ 8,563    
International Life Insurance Subsidiaries [Member]          
Statutory surplus          
Statutory Accounting Practices, Risk Based Capital Requirements Compliance Assertion   All of the Company's international insurance subsidiaries have solvency margins in excess of the minimum levels required by the applicable regulatory authorities.      
Scenario, Forecast [Member] | Property and casualty insurance subsidiaries          
Statutory surplus          
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval         $ 1,500
Scenario, Forecast [Member] | Hartford Life Insurance Company [Member]          
Statutory Accounting Practices [Line Items]          
Statutory Accounting Practices, Dividends Paid with Approval of Regulatory Agency $ 300        
Statutory surplus          
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval         1,000
Scenario, Forecast [Member] | Hartford Life and Accident Insurance Company [Member]          
Statutory surplus          
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval         $ 207