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Reinsurance - Credit Quality Information (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross $ 5,713    
Allowance for uncollectible reinsurance 52 $ 50 $ 48
Net Reinsurance Recoverables 5,596   5,527
Uncollectible reinsurance      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross   5,641 5,641
Allowance for uncollectible reinsurance 117 116 114
Net Reinsurance Recoverables   5,525 5,527
Mandatory and Voluntary Risk Pools [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 261    
Captives [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 328    
Other not rated companies [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 330    
AMBestRated [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 4,794    
AM Best, A++ Rating [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 1,232    
AM Best, A+ Rating [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 2,287    
AM Best, A Rating [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 519    
AM Best, A- Rating [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 44    
AM Best, B++ Rating [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 688    
AM Best, Below plus plus Rating [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 24    
Corporate Segment [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 319    
Allowance for uncollectible reinsurance 2 1 0
Net Reinsurance Recoverables 317    
Corporate Segment [Member] | Uncollectible reinsurance      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Allowance for uncollectible reinsurance 2   0
Corporate Segment [Member] | Mandatory and Voluntary Risk Pools [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 0    
Corporate Segment [Member] | Captives [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 0    
Corporate Segment [Member] | Other not rated companies [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 0    
Corporate Segment [Member] | AMBestRated [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 319    
Corporate Segment [Member] | AM Best, A++ Rating [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 0    
Corporate Segment [Member] | AM Best, A+ Rating [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 316    
Corporate Segment [Member] | AM Best, A Rating [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 0    
Corporate Segment [Member] | AM Best, A- Rating [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 0    
Corporate Segment [Member] | AM Best, B++ Rating [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 3    
Corporate Segment [Member] | AM Best, Below plus plus Rating [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 0    
Property, Liability and Casualty Insurance Product Line | Operating Segments [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 5,139    
Allowance for uncollectible reinsurance 49 48 48
Net Reinsurance Recoverables 5,025    
Property, Liability and Casualty Insurance Product Line | Operating Segments [Member] | Uncollectible reinsurance      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Allowance for uncollectible reinsurance 114   114
Property, Liability and Casualty Insurance Product Line | Operating Segments [Member] | Mandatory and Voluntary Risk Pools [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 261    
Property, Liability and Casualty Insurance Product Line | Operating Segments [Member] | Captives [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 328    
Property, Liability and Casualty Insurance Product Line | Operating Segments [Member] | Other not rated companies [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 322    
Property, Liability and Casualty Insurance Product Line | Operating Segments [Member] | AMBestRated [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 4,228    
Property, Liability and Casualty Insurance Product Line | Operating Segments [Member] | AM Best, A++ Rating [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 1,232    
Property, Liability and Casualty Insurance Product Line | Operating Segments [Member] | AM Best, A+ Rating [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 1,735    
Property, Liability and Casualty Insurance Product Line | Operating Segments [Member] | AM Best, A Rating [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 519    
Property, Liability and Casualty Insurance Product Line | Operating Segments [Member] | AM Best, A- Rating [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 34    
Property, Liability and Casualty Insurance Product Line | Operating Segments [Member] | AM Best, B++ Rating [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 685    
Property, Liability and Casualty Insurance Product Line | Operating Segments [Member] | AM Best, Below plus plus Rating [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 23    
Group Benefits [Member] | Operating Segments [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 255    
Allowance for uncollectible reinsurance 1 $ 1 0
Net Reinsurance Recoverables 254    
Group Benefits [Member] | Operating Segments [Member] | Uncollectible reinsurance      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Allowance for uncollectible reinsurance 1   $ 0
Group Benefits [Member] | Operating Segments [Member] | Mandatory and Voluntary Risk Pools [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 0    
Group Benefits [Member] | Operating Segments [Member] | Captives [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 0    
Group Benefits [Member] | Operating Segments [Member] | Other not rated companies [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 8    
Group Benefits [Member] | Operating Segments [Member] | AMBestRated [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 247    
Group Benefits [Member] | Operating Segments [Member] | AM Best, A++ Rating [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 0    
Group Benefits [Member] | Operating Segments [Member] | AM Best, A+ Rating [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 236    
Group Benefits [Member] | Operating Segments [Member] | AM Best, A Rating [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 0    
Group Benefits [Member] | Operating Segments [Member] | AM Best, A- Rating [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 10    
Group Benefits [Member] | Operating Segments [Member] | AM Best, B++ Rating [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross 0    
Group Benefits [Member] | Operating Segments [Member] | AM Best, Below plus plus Rating [Member]      
Reinsurance Recoverable, Credit Quality Indicator [Line Items]      
Reinsurance Recoverables, Gross $ 1