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Basis of Presentation and Significant Accounting Policies (Details) - USD ($)
 12 Months Ended
May 23, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Reserve for future policy benefits   $ 596,000,000 $ 638,000,000    
Participating dividends to policyholders   24,000,000 29,000,000 $ 30,000,000  
Accumulated depreciation   2,300,000,000 2,100,000,000    
Depreciation expense   342,000,000 313,000,000 283,000,000  
Deposit Contracts, Liabilities   $ 99,000,000      
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      
Retroactive Reinsurance [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Paid loss and loss adjustment expenses   $ 1,300,000,000 1,100,000,000    
Adverse Development Cover Navigators Group [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Deferred Revenue   209,000,000      
Deferred Revenue, Additions   246,000,000 312,000,000 $ 16,000,000  
Adverse Development Cover Navigators Group [Member] | Other liabilities          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Deferred Revenue   $ 574,000,000 $ 328,000,000    
Property and Casualty Insurance Subsidiaries          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Participating Insurance, Percentage of Premium Income   7.00% 7.00% 9.00%  
Accounting Standards Update 2017-04 [Member] | Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest         $ 0
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest       $ 2,000,000  
Accounting Standards Update 2016-13 [Member] | Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest         (18,000,000)
Accounting Standards Update 2016-13 [Member] | Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment [Member] | Other liabilities          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest         $ 25,000,000
The Navigators Group, Inc. [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Business Acquisition, Share Price $ 70        
Business Combination, Consideration Transferred $ 2,137,000,000