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Reinsurance - Reinsurance Recoverable, Allowance for Credit Loss (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward]        
Beginning allowance for uncollectible reinsurance $ (52) $ (48)    
Reinsurance Recoverable, Credit Loss Expense (Reversal) (1) (3)    
Reinsurance Recoverable, Allowance for Credit Loss, Recovery (1) (1)    
Ending allowance for uncollectible reinsurance (54) (54)    
Operating Segments [Member] | Property, Liability and Casualty Insurance Product Line        
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward]        
Beginning allowance for uncollectible reinsurance (49) (48)    
Reinsurance Recoverable, Credit Loss Expense (Reversal) (1) (2)    
Reinsurance Recoverable, Allowance for Credit Loss, Recovery (1) (1)    
Ending allowance for uncollectible reinsurance (51) (51)    
Operating Segments [Member] | Group Benefits [Member]        
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward]        
Beginning allowance for uncollectible reinsurance (1) 0    
Reinsurance Recoverable, Credit Loss Expense (Reversal) 0 0    
Reinsurance Recoverable, Allowance for Credit Loss, Recovery 0 0    
Ending allowance for uncollectible reinsurance (1) (1)    
Corporate, Non-Segment [Member]        
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward]        
Beginning allowance for uncollectible reinsurance (2) 0    
Reinsurance Recoverable, Credit Loss Expense (Reversal) 0 (1)    
Reinsurance Recoverable, Allowance for Credit Loss, Recovery 0 0    
Ending allowance for uncollectible reinsurance (2) (2)    
Uncollectible reinsurance        
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward]        
Beginning allowance for uncollectible reinsurance (117) (114)    
Ending allowance for uncollectible reinsurance (111) (111)    
Uncollectible reinsurance | Operating Segments [Member] | Property, Liability and Casualty Insurance Product Line        
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward]        
Beginning allowance for uncollectible reinsurance (114) (114)    
Ending allowance for uncollectible reinsurance (108) (108)    
Uncollectible reinsurance | Operating Segments [Member] | Group Benefits [Member]        
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward]        
Beginning allowance for uncollectible reinsurance (1) 0    
Ending allowance for uncollectible reinsurance (1) (1)    
Uncollectible reinsurance | Corporate, Non-Segment [Member]        
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward]        
Beginning allowance for uncollectible reinsurance (2) 0    
Ending allowance for uncollectible reinsurance (2) (2)    
Disputes [Member]        
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward]        
Beginning allowance for uncollectible reinsurance (65) (66)    
Ending allowance for uncollectible reinsurance (57) (57)    
Disputes [Member] | Operating Segments [Member] | Property, Liability and Casualty Insurance Product Line        
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward]        
Beginning allowance for uncollectible reinsurance (65) (66)    
Ending allowance for uncollectible reinsurance (57) (57)    
Disputes [Member] | Operating Segments [Member] | Group Benefits [Member]        
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward]        
Beginning allowance for uncollectible reinsurance 0 0    
Ending allowance for uncollectible reinsurance 0 0    
Disputes [Member] | Corporate, Non-Segment [Member]        
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward]        
Beginning allowance for uncollectible reinsurance 0 0    
Ending allowance for uncollectible reinsurance 0 0    
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]        
Reinsurance Recoverable, Past Due [Line Items]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest     $ 0 $ (2)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Operating Segments [Member] | Property, Liability and Casualty Insurance Product Line        
Reinsurance Recoverable, Past Due [Line Items]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest     0 0
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Operating Segments [Member] | Group Benefits [Member]        
Reinsurance Recoverable, Past Due [Line Items]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest     0 (1)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Corporate, Non-Segment [Member]        
Reinsurance Recoverable, Past Due [Line Items]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest     $ 0 $ (1)
Cumulative Effect, Period of Adoption, Adjusted Balance [Member]        
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward]        
Beginning allowance for uncollectible reinsurance (52) (50)    
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Operating Segments [Member] | Property, Liability and Casualty Insurance Product Line        
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward]        
Beginning allowance for uncollectible reinsurance (49) (48)    
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Operating Segments [Member] | Group Benefits [Member]        
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward]        
Beginning allowance for uncollectible reinsurance (1) (1)    
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Corporate, Non-Segment [Member]        
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward]        
Beginning allowance for uncollectible reinsurance $ (2) $ (1)