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Share-Based Payments (Narrative) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Jan. 10, 2024
Mar. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Tax benefit realized for exercises of stock options     $ 2,000,000 $ 8,000,000 $ 12,000,000
Tax benefit realized upon vesting of restricted stock shares, restricted stock units, and performance shares     77,000,000 75,000,000 30,000,000
Cash used to settle performance units       1,000,000 1,000,000
Total Compensation Cost Recognized     254,000,000 208,000,000 268,000,000
Assurance IQ          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Tax benefit realized for exercises of stock options     1,000,000 4,000,000 4,000,000
Total Compensation Cost Recognized     $ 3,000,000 12,000,000 16,000,000
Omnibus Incentive Plan          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Authorized shares remain available for grant including previously authorized but unissued shares under the Option Plan     12,768,038    
Employee stock options          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Maximum term of stock option granted (in years)     10 years    
Vesting period     3 years    
The total intrinsic value of stock options exercised     $ 8,000,000 33,000,000 48,000,000
Granted (in shares)     0    
Total Compensation Cost Recognized     $ 0 $ 1,000,000 2,000,000
Employee stock options | Assurance IQ          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Maximum term of stock option granted (in years)     10 years    
Vesting period     3 years    
Weighed Average grant date fair value of stock options granted (in dollars per share)     $ 0 $ 0  
The total intrinsic value of stock options exercised     $ 3,000,000 $ 15,000,000 15,000,000
Unrecognized Compensation Cost     $ 1,000,000    
Weighted Average Recognition Period (in years)     1 month 17 days    
Granted (in shares)     0    
Total Compensation Cost Recognized     $ 2,000,000 10,000,000 14,000,000
Employee Restricted Stock Restricted Units And Performance Shares          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
The fair market value of share awards released     360,000,000 366,000,000 155,000,000
Unrecognized Compensation Cost     $ 186,000,000    
Weighted Average Recognition Period (in years)     1 year 8 months 26 days    
Employee Restricted Stock Restricted Units And Performance Shares | Assurance IQ          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
The fair market value of share awards released     $ 1,000,000 $ 2,000,000 $ 3,000,000
Unrecognized Compensation Cost     $ 1,000,000    
Weighted Average Recognition Period (in years)     4 months 24 days    
Employee restricted stock units          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Granted (in dollars per share)     $ 102.64 $ 119.71 $ 81.82
Granted (in shares)     2,192,898    
Total Compensation Cost Recognized     $ 200,000,000 $ 189,000,000 $ 178,000,000
Employee restricted stock units | Assurance IQ          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Granted (in dollars per share)     $ 0.00 $ 0 $ 0
Granted (in shares)     0    
Total Compensation Cost Recognized     $ 1,000,000 $ 2,000,000 $ 2,000,000
Employee performance shares and performance units          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Granted (in dollars per share)     $ 103.27 $ 121.29 $ 81.43
Granted (in shares)     749,174    
Total Compensation Cost Recognized     $ 54,000,000 $ 18,000,000 $ 88,000,000
Employee performance shares and performance units | Subsequent Event | Forecast          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Granted (in shares)   600,000      
Total Compensation Cost Recognized $ 66,000,000 $ 64,000,000      
Employee performance shares and performance units | Assurance IQ          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Tax benefit realized upon vesting of restricted stock shares, restricted stock units, and performance shares     1,000,000 1,000,000 1,000,000
Total Compensation Cost Recognized     $ 0 $ 0 $ 0