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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

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