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Reserve for Unpaid Losses and Loss Adjustment Expenses - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Liability for Claims and Claims Adjustment Expense [Line Items]            
Current accident year benefit from discounting property and casualty reserves     $ 12 $ 15 $ 27  
Group Insurance Policies            
Liability for Claims and Claims Adjustment Expense [Line Items]            
Prior accident year development     (324) (185) (162)  
Reinsurance and Other Recoverables $ 239 $ 209 239 209 208 $ 218
Liability for Unpaid Claims and Claims Adjustment Expense, Net 8,206 8,303 8,206 $ 8,303 $ 5,564 $ 5,671
Scenario, Adjustment [Member]            
Liability for Claims and Claims Adjustment Expense [Line Items]            
Reinsurance and Other Recoverables 90   $ 90      
Minimum | Group Insurance Policies            
Liability for Claims and Claims Adjustment Expense [Line Items]            
Range of discount rates     2.10% 2.10% 3.00%  
Maximum | Group Insurance Policies            
Liability for Claims and Claims Adjustment Expense [Line Items]            
Range of discount rates     8.00% 8.00% 8.00%  
Property and Casualty Insurance Products            
Liability for Claims and Claims Adjustment Expense [Line Items]            
Reinsurance and Other Recoverables 4,232   $ 4,232      
Liability for Unpaid Claims and Claims Adjustment Expense, Net 20,352   $ 20,352      
Property and Casualty Insurance Products | Minimum            
Liability for Claims and Claims Adjustment Expense [Line Items]            
Range of discount rates     1.77% 1.77% 1.77%  
Property and Casualty Insurance Products | Maximum            
Liability for Claims and Claims Adjustment Expense [Line Items]            
Range of discount rates     14.15% 14.15% 14.15%  
Catastrophes            
Liability for Claims and Claims Adjustment Expense [Line Items]            
Prior accident year development     $ (49) $ (16) $ (7)  
Catastrophes | Scenario, Adjustment [Member]            
Liability for Claims and Claims Adjustment Expense [Line Items]            
Prior accident year development     133      
Catastrophes | Scenario, Plan [Member]            
Liability for Claims and Claims Adjustment Expense [Line Items]            
Liability for Unpaid Claims and Claims Adjustment Expense, Net 850   850      
Asbestos and Environmental            
Liability for Claims and Claims Adjustment Expense [Line Items]            
Adverse development from comprehensive annual review 238 $ 285        
Reinsurance recoverable during period 238     285    
Reinsurance and Other Recoverables 1,032   1,032      
Liability for Unpaid Claims and Claims Adjustment Expense, Net 1,254   1,254      
Group long-term disability | Group Insurance Policies            
Liability for Claims and Claims Adjustment Expense [Line Items]            
Prior accident year development     230 125 90  
Reinsurance and Other Recoverables 235   235      
Liability for Unpaid Claims and Claims Adjustment Expense, Net 6,767   6,767      
Group life and accident, excluding premium waiver | Group Insurance Policies            
Liability for Claims and Claims Adjustment Expense [Line Items]            
Prior accident year development     90 $ 60 $ 75  
Reinsurance and Other Recoverables 2   2      
Liability for Unpaid Claims and Claims Adjustment Expense, Net $ 575   $ 575