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Acquisitions and Disposition - Narrative (Details) - USD ($)
3 Months Ended
Jan. 26, 2021
Jan. 04, 2021
Mar. 31, 2021
Dec. 31, 2020
Nov. 19, 2020
Dec. 31, 2019
Feb. 12, 2019
Business Acquisition [Line Items]              
Long-term debt       $ 7,825,000,000   $ 6,631,000,000  
Goodwill       $ 2,544,000,000   $ 2,545,000,000  
Forecast              
Business Acquisition [Line Items]              
Loss on disposition     $ 3,000,000,000        
Subsequent Event              
Business Acquisition [Line Items]              
Proceeds from affiliates $ 2,800,000,000            
Senior Notes Due 2025 at 0.750 Percent              
Business Acquisition [Line Items]              
Long-term debt         $ 600,000,000    
Note stated interest rate (as a percent)       0.75% 0.75%    
Senior Notes Due 2030 at 1.45 Percent              
Business Acquisition [Line Items]              
Long-term debt         $ 600,000,000    
Note stated interest rate (as a percent)       1.45% 1.45%    
National General | Subsequent Event              
Business Acquisition [Line Items]              
Consideration transferred   $ 4,000,000,000          
Share price, cash (in shares)   $ 32.00          
Share price, dividend (in USD per share)   2.50          
Share price (in USD per share)   $ 34.50          
iCracked              
Business Acquisition [Line Items]              
Goodwill             $ 17,000,000