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Acquisitions (Details) - USD ($)
9 Months Ended
Jan. 01, 2021
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Feb. 12, 2019
Business Acquisition [Line Items]          
Goodwill   $ 2,544,000,000   $ 2,545,000,000  
Proceeds from issuance of long-term debt   0 $ 491,000,000    
Stock repurchase program   $ 3,000,000,000.00      
iCracked          
Business Acquisition [Line Items]          
Goodwill         $ 17,000,000
Forecast | National General          
Business Acquisition [Line Items]          
Consideration transferred $ 4,000,000,000        
Share price, cash (in USD per share) $ 32.00        
Share price, dividend (in USD per share) 2.50        
Share price (in USD per share) $ 34.50        
Cash to acquire businesses $ 2,200,000,000        
Proceeds from issuance of long-term debt $ 1,500,000,000