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Revenues - Schedule of Disaggregated by Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disaggregation Of Revenue [Line Items] |  |  |
Investment Income, Nonoperating | $ 93 | $ 52 | $ 7
Other income, net | 7 | 6 | 3
Total revenues | 4,805 | 4,257 | 3,573
Base Commission Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 3,282 | 2,868 | 2,377
Fee Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 992 | 995 | 912
Other Supplemental Commissions Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 188 | 178 | 159
Profit-Sharing Contingent Commission Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 166 | 130 | 89
Earned premium |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 77 | 28 | 26
Operating Segments |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenues | 4,745 | 4,222 | 3,568
Operating Segments | Retail |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Investment Income, Nonoperating | 6 | 1 | 0
Other income, net | 3 | 4 | 3
Total revenues | 2,729 | 2,508 | 2,157
Operating Segments | Retail | Base Commission Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 1,874 | 1,692 | 1,421
Operating Segments | Retail | Fee Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 631 | 597 | 546
Operating Segments | Retail | Other Supplemental Commissions Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 171 | 164 | 138
Operating Segments | Retail | Profit-Sharing Contingent Commission Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 44 | 50 | 49
Operating Segments | Retail | Earned premium |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 0 | 0 | 0
Operating Segments | Programs |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Investment Income, Nonoperating | 23 | 12 | 1
Other income, net | 2 | 1 | 0
Total revenues | 1,400 | 1,173 | 958
Operating Segments | Programs | Base Commission Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 924 | 736 | 589
Operating Segments | Programs | Fee Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 270 | 322 | 298
Operating Segments | Programs | Other Supplemental Commissions Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 9 | 9 | 16
Operating Segments | Programs | Profit-Sharing Contingent Commission Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 95 | 65 | 28
Operating Segments | Programs | Earned premium |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 77 | 28 | 26
Operating Segments | Wholesale Brokerage |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Investment Income, Nonoperating | 6 | 2 | 0
Other income, net | 0 | 0 | 0
Total revenues | 616 | 541 | 453
Operating Segments | Wholesale Brokerage | Base Commission Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 483 | 440 | 367
Operating Segments | Wholesale Brokerage | Fee Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 92 | 78 | 69
Operating Segments | Wholesale Brokerage | Other Supplemental Commissions Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 8 | 6 | 5
Operating Segments | Wholesale Brokerage | Profit-Sharing Contingent Commission Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 27 | 15 | 12
Operating Segments | Wholesale Brokerage | Earned premium |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 0 | 0 | 0
Other |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Investment Income, Nonoperating | 58 | 37 | 6
Other income, net | 2 | 1 | 0
Total revenues | 60 | 35 | 5
Other | Base Commission Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 1 | 0 | 0
Other | Fee Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | (1) | (2) | (1)
Other | Other Supplemental Commissions Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 0 | 1 | 0
Other | Profit-Sharing Contingent Commission Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 0 | 0 | 0
Other | Earned premium |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | $ 0 | $ 0 | $ 0

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