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Revenues - Schedule of Disaggregated by Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Disaggregation Of Revenue [Line Items]    
Investment Income, Nonoperating $ 18 $ 18
Other income, net 1 3
Total revenues 1,404 1,258
Base Commission Revenue    
Disaggregation Of Revenue [Line Items]    
Fees and Commissions, Other 958 864
Fee Revenue    
Disaggregation Of Revenue [Line Items]    
Fees and Commissions, Other 265 227
Other Supplemental Commissions Revenue    
Disaggregation Of Revenue [Line Items]    
Fees and Commissions, Other 100 90
Profit-Sharing Contingent Commission Revenue    
Disaggregation Of Revenue [Line Items]    
Fees and Commissions, Other 43 46
Earned premium    
Disaggregation Of Revenue [Line Items]    
Fees and Commissions, Other 19 10
Operating Segments    
Disaggregation Of Revenue [Line Items]    
Total revenues 1,394 1,246
Operating Segments | Retail    
Disaggregation Of Revenue [Line Items]    
Investment Income, Nonoperating 2 1
Other income, net 0 2
Total revenues 907 806
Operating Segments | Retail | Base Commission Revenue    
Disaggregation Of Revenue [Line Items]    
Fees and Commissions, Other 617 547
Operating Segments | Retail | Fee Revenue    
Disaggregation Of Revenue [Line Items]    
Fees and Commissions, Other 177 156
Operating Segments | Retail | Other Supplemental Commissions Revenue    
Disaggregation Of Revenue [Line Items]    
Fees and Commissions, Other 97 86
Operating Segments | Retail | Profit-Sharing Contingent Commission Revenue    
Disaggregation Of Revenue [Line Items]    
Fees and Commissions, Other 14 14
Operating Segments | Retail | Earned premium    
Disaggregation Of Revenue [Line Items]    
Fees and Commissions, Other 0 0
Operating Segments | Programs    
Disaggregation Of Revenue [Line Items]    
Investment Income, Nonoperating 4 5
Other income, net 1 1
Total revenues 328 298
Operating Segments | Programs | Base Commission Revenue    
Disaggregation Of Revenue [Line Items]    
Fees and Commissions, Other 218 206
Operating Segments | Programs | Fee Revenue    
Disaggregation Of Revenue [Line Items]    
Fees and Commissions, Other 65 49
Operating Segments | Programs | Other Supplemental Commissions Revenue    
Disaggregation Of Revenue [Line Items]    
Fees and Commissions, Other 1 1
Operating Segments | Programs | Profit-Sharing Contingent Commission Revenue    
Disaggregation Of Revenue [Line Items]    
Fees and Commissions, Other 20 26
Operating Segments | Programs | Earned premium    
Disaggregation Of Revenue [Line Items]    
Fees and Commissions, Other 19 10
Operating Segments | Wholesale Brokerage    
Disaggregation Of Revenue [Line Items]    
Investment Income, Nonoperating 1 1
Other income, net 0 0
Total revenues 159 142
Operating Segments | Wholesale Brokerage | Base Commission Revenue    
Disaggregation Of Revenue [Line Items]    
Fees and Commissions, Other 123 111
Operating Segments | Wholesale Brokerage | Fee Revenue    
Disaggregation Of Revenue [Line Items]    
Fees and Commissions, Other 24 21
Operating Segments | Wholesale Brokerage | Other Supplemental Commissions Revenue    
Disaggregation Of Revenue [Line Items]    
Fees and Commissions, Other 2 3
Operating Segments | Wholesale Brokerage | Profit-Sharing Contingent Commission Revenue    
Disaggregation Of Revenue [Line Items]    
Fees and Commissions, Other 9 6
Operating Segments | Wholesale Brokerage | Earned premium    
Disaggregation Of Revenue [Line Items]    
Fees and Commissions, Other 0 0
Other    
Disaggregation Of Revenue [Line Items]    
Investment Income, Nonoperating 11 11
Other income, net 0 0
Total revenues 10 12
Other | Base Commission Revenue    
Disaggregation Of Revenue [Line Items]    
Fees and Commissions, Other 0 0
Other | Fee Revenue    
Disaggregation Of Revenue [Line Items]    
Fees and Commissions, Other (1) 1
Other | Other Supplemental Commissions Revenue    
Disaggregation Of Revenue [Line Items]    
Fees and Commissions, Other 0 0
Other | Profit-Sharing Contingent Commission Revenue    
Disaggregation Of Revenue [Line Items]    
Fees and Commissions, Other 0 0
Other | Earned premium    
Disaggregation Of Revenue [Line Items]    
Fees and Commissions, Other $ 0 $ 0