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Basis of Presentation and Significant Accounting Policies (Details) - USD ($)
 12 Months Ended
Jan. 01, 2018
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Excess tax benefit recognized in earnings     $ 15,000,000 $ 0 $ 0  
Stock-based compensation     (15,000,000) 0 0  
Reclassification from AOCI to retained earnings related to reduction in the federal tax rate   $ 105,000,000        
OCI before reclassifications     731,000,000 (13,000,000) (1,279,000,000)  
Equity securities, AFS   1,012,000,000 1,012,000,000 945,000,000    
Participating dividends to policyholders     35,000,000 15,000,000 17,000,000  
Maximum uncollateralized threshold for derivative counter party for single legal entity     10,000,000      
Accumulated depreciation   2,600,000,000 2,600,000,000 2,500,000,000    
Depreciation expense     197,000,000 186,000,000 164,000,000  
Annuity obligations   688,000,000 688,000,000 712,000,000    
Property and Casualty Insurance Products            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Net written premiums     $ 10,517,000,000 $ 10,568,000,000 $ 10,578,000,000  
Weighted average interest rate     3.06% 3.11% 3.24%  
Structured Settlements            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Weighted average interest rate     6.70% 6.69%    
Minimum | Other Intangible Assets            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Useful lives     1 year      
Maximum | Other Intangible Assets            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Useful lives     15 years      
Property and Casualty Insurance Products            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Net written premiums     $ 0.10 $ 0.09 $ 0.10  
Allowance for Doubtful Accounts            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Valuation allowances and reserves   $ 132,000,000 132,000,000 137,000,000 134,000,000 $ 131,000,000
Insurance Operating Costs            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Distribution costs     (188,000,000) (184,000,000) (190,000,000)  
Fee Income            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Distribution costs     188,000,000 184,000,000 190,000,000  
Equity securities, trading | Pro Forma            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Unrealized gains after-tax in net income     25,000,000      
Additional Paid-in Capital            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Excess tax benefit recognized in earnings     15,000,000      
Excess tax benefit recognized in additional paid in capital     0 5,000,000 27,000,000  
Accumulated Net Unrealized Investment Gain (Loss)            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
OCI before reclassifications     857,000,000 $ 83,000,000 $ (1,112,000,000)  
Discontinued Operations            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Reduction in estimated loss on sale related to reduction in the federal tax rate     $ (193,000,000)      
Subsequent Event | Accumulated Net Unrealized Investment Gain (Loss)            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
OCI before reclassifications $ 83,000,000