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Guarantees and Contingent Liabilities (Details)
3 Months Ended
Jun. 17, 2015
Plaintiff
Mar. 31, 2016
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2016
USD ($)
claim
Mar. 31, 2016
USD ($)
Plaintiff
Mar. 31, 2016
USD ($)
employee
Mar. 31, 2016
USD ($)
defense
Dec. 31, 2015
USD ($)
Aug. 19, 2015
opinion
Guarantees:                  
Limitations or indemnifications of reinsurance agreements   $ 0 $ 0 $ 0 $ 0 $ 0 $ 0    
Proceedings:                  
Number of class action cases | claim       2          
Opinions, number | opinion                 3
Number of former employee agents plaintiffs seek benefits for | employee           6,300      
Loss contingency, number of plaintiffs 10       459 30      
Number of defenses | defense             2    
Reserves for asbestos claims   907,000,000 907,000,000 $ 907,000,000 $ 907,000,000 $ 907,000,000 $ 907,000,000 $ 960,000,000  
Reinsurance recoverables for asbestos claims   450,000,000 450,000,000 450,000,000 450,000,000 450,000,000 450,000,000 458,000,000  
Reserves for environmental claims   178,000,000 178,000,000 178,000,000 178,000,000 178,000,000 178,000,000 179,000,000  
Reinsurance recoverables for environmental claims   $ 43,000,000 $ 43,000,000 $ 43,000,000 $ 43,000,000 $ 43,000,000 $ 43,000,000 $ 43,000,000  
Percentage of net asbestos and environmental reserves that were for incurred but not reported estimated losses   58.00% 58.00% 58.00% 58.00% 58.00% 58.00% 57.00%  
Minimum                  
Proceedings:                  
Loss contingencies, reasonably possible pretax loss exposure in excess of the amount accrued     $ 0            
Maximum                  
Proceedings:                  
Loss contingencies, reasonably possible pretax loss exposure in excess of the amount accrued     875,000,000            
Residual guarantee                  
Guarantees:                  
Potential leased automobiles residual value   $ 48,000,000 48,000,000 $ 48,000,000 $ 48,000,000 $ 48,000,000 $ 48,000,000    
Guarantee obligations term, low end of range   1 year              
Guarantee obligations term, high end of range   4 years              
Maximum amount at risk pursuant to a guarantee   $ 4,000,000 $ 4,000,000 $ 4,000,000 $ 4,000,000 $ 4,000,000 $ 4,000,000    
Against Allstate                  
Proceedings:                  
Opinions, number | opinion                 2
In Favor of Allstate                  
Proceedings:                  
Opinions, number | opinion                 1
Signed Releases Knowingly and Voluntarily | Judicial Ruling                  
Proceedings:                  
Loss contingency, number of plaintiffs | Plaintiff 2                
Did Not Sign Releases Knowingly and Voluntarily | Judicial Ruling                  
Proceedings:                  
Loss contingency, number of plaintiffs | Plaintiff 8