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Revenue - Schedule of Components of Interest and Other Income (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Disaggregation of Revenue [Line Items]        
Book-of-business settlements $ 3 $ 2 $ 5 $ 4
Interest income 40 44 79 87
Other income 3 0 5 1
Total interest and other income 46 46 89 92
HWC [Member]        
Disaggregation of Revenue [Line Items]        
Book-of-business settlements 0 0 2 0
Interest income 7 9 14 18
Other income 1 0 1 0
Total interest and other income 8 9 17 18
R&B [Member]        
Disaggregation of Revenue [Line Items]        
Book-of-business settlements 3 2 3 4
Interest income 23 29 45 57
Other income 2 0 4 1
Total interest and other income 28 31 52 62
Corporate Segment [Member]        
Disaggregation of Revenue [Line Items]        
Book-of-business settlements 0 0 0 0
Interest income 10 6 20 12
Other income 0 0 0 0
Total interest and other income [1] $ 10 $ 6 $ 20 $ 12
[1] Reimbursable expenses and other, as well as Corporate revenue, are excluded from segment revenue, but included in total revenue on the condensed consolidated statements of comprehensive income. Amounts included in Corporate revenue may include eliminations, adjustments to reserves and impacts from hedged revenue transactions.