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Business Acquisitions - Fair Value of Assets Acquired and Liabilities Assumed at the Acquisition Date (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
May 23, 2019
Dec. 31, 2018
Business Acquisition [Line Items]          
Goodwill   $ 1,911 $ 1,913   $ 1,290
Goodwill, Purchase Accounting Adjustments   (2)      
The Navigators Group, Inc. [Member]          
Business Acquisition [Line Items]          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents   3,851   $ 3,848  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premiums Receivable   498   492  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Reinsurance Recoverables   1,097   1,100  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Prepaid Reinsurance Premiums   238   238  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   580   580  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment   83   83  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets   102   99  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets   6,449   6,440  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Unpaid Losses and Loss Adjustment Expenses   2,823   2,823  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue   1,219   1,219  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt   284   284  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities   47   48  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other   576   568  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities   4,949   4,942  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net   1,500   1,498  
Goodwill   621   623  
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net   $ 2,121   $ 2,121  
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Cash and Cash Equivalents $ 3        
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Premiums Receivable 6        
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Reinsurance Recoverables (3)        
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Prepaid Reinsurance Premiums 0        
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles 0        
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment 0        
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Assets 3        
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Total Assets 9        
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Unpaid Loss and Loss Adjustment Expenses 0        
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Liability for Future Policy Benefits 0        
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Long-term Debt 0        
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Deferred Income Taxes (1)        
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Liabilities 8        
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Total Liabilities 7        
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Assets and Liabilities, Net 2        
Goodwill, Purchase Accounting Adjustments (2)        
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Assets Liabilities and Goodwill, Net $ 0