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Share-Based Payments (Weighted Average Remaining Contractual Term and Aggregate Intrinsic Value of Stock Options Outstanding, Vested and Expected to Vest, and Exercisable) (Details) - Employee stock options
$ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Outstanding, Weighted Average Remaining Contractual Term 3 years 7 months 2 days
Exercisable, Weighted Average Remaining Contractual Term 3 years 7 months 2 days
Outstanding, Aggregate Intrinsic Value $ 17
Exercisable, Aggregate Intrinsic Value $ 17
Assurance IQ  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Outstanding, Weighted Average Remaining Contractual Term 4 years 10 months 13 days
Exercisable, Weighted Average Remaining Contractual Term 4 years 10 months 6 days
Outstanding, Aggregate Intrinsic Value $ 2
Exercisable, Aggregate Intrinsic Value $ 2