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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, 2021
Dec. 31, 2020
Dec. 31, 2019
May 23, 2019
Business Acquisition [Line Items]          
Goodwill   $ 1,911 $ 1,911 $ 1,913  
Goodwill, Purchase Accounting Adjustments   $ 0 (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