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Business Acquisitions - Intangible Assets Recorded in Connection with the Acquisition (Details) - USD ($)
2 Months Ended 12 Months Ended
May 23, 2019
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Nov. 01, 2017
The Navigators Group, Inc. [Member]          
Business Acquisition [Line Items]          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles $ 499,000,000        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets 81,000,000        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill $ 580,000,000        
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 10 years        
The Navigators Group, Inc. [Member] | Lloyd's Syndicate Capacity [Member]          
Business Acquisition [Line Items]          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets $ 66,000,000        
The Navigators Group, Inc. [Member] | License [Member]          
Business Acquisition [Line Items]          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets 15,000,000        
The Navigators Group, Inc. [Member] | Value of in-force contracts [1]          
Business Acquisition [Line Items]          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles $ 180,000,000        
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 1 year        
Finite-lived Intangible Assets Acquired     $ 180    
The Navigators Group, Inc. [Member] | Distribution relationships [Member]          
Business Acquisition [Line Items]          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles $ 302,000,000        
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 15 years        
Finite-lived Intangible Assets Acquired     302    
The Navigators Group, Inc. [Member] | Trade Names [Member]          
Business Acquisition [Line Items]          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles $ 17,000,000        
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 10 years        
Finite-lived Intangible Assets Acquired     $ 17    
Aetna Group Insurance [Member]          
Business Acquisition [Line Items]          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles       $ 629,000,000 $ 629,000,000
Finite-lived Intangible Assets Acquired   $ 629,000,000      
Aetna Group Insurance [Member] | Value of in-force contracts [1]          
Business Acquisition [Line Items]          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   1 year      
Finite-lived Intangible Assets Acquired   $ 23,000,000      
Aetna Group Insurance [Member] | Customer relationships [2]          
Business Acquisition [Line Items]          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   15 years      
Finite-lived Intangible Assets Acquired   $ 590,000,000      
Aetna Group Insurance [Member] | Marketing agreement with Aetna          
Business Acquisition [Line Items]          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   15 years      
Finite-lived Intangible Assets Acquired   $ 16,000,000      
Aetna Group Insurance [Member] | Software and Software Development Costs [Member]          
Business Acquisition [Line Items]          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   5 years      
Aetna Group Insurance [Member] | Intangible Assets Arising from Insurance Contracts Acquired in Business Combination [Member]          
Business Acquisition [Line Items]          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   12 years