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Revenues - Schedule of Disaggregated by Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Disaggregation Of Revenue [Line Items] |  |  |  |
Investment Income, Nonoperating | $ 31 | $ 17 | $ 71 | $ 34
Other income, net | 0 | 2 | 6 | 4
Total revenues | 1,186 | 1,068 | 3,622 | 3,231
Base Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 822 | 721 | 2,505 | 2,176
Fee Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 251 | 258 | 716 | 748
Other Supplemental Commissions Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 32 | 31 | 162 | 147
Profit-Sharing Contingent Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 27 | 27 | 110 | 88
Earned premium |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 23 | 12 | 52 | 34
Operating Segments | Retail |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Investment Income, Nonoperating | 2 | 0 | 3 | 0
Other income, net | 0 | 2 | 3 | 4
Total revenues | 641 | 602 | 2,093 | 1,926
Operating Segments | Retail | Base Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 444 | 412 | 1,440 | 1,297
Operating Segments | Retail | Fee Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 158 | 150 | 469 | 446
Operating Segments | Retail | Other Supplemental Commissions Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 29 | 29 | 148 | 139
Operating Segments | Retail | Profit-Sharing Contingent Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 8 | 9 | 30 | 40
Operating Segments | Retail | Earned premium |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 0 | 0 | 0 | 0
Operating Segments | Programs |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Investment Income, Nonoperating | 6 | 4 | 17 | 7
Other income, net | 0 | 0 | 2 | 0
Total revenues | 353 | 305 | 1,010 | 870
Operating Segments | Programs | Base Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 249 | 189 | 696 | 543
Operating Segments | Programs | Fee Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 67 | 87 | 177 | 246
Operating Segments | Programs | Other Supplemental Commissions Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 1 | 1 | 8 | 5
Operating Segments | Programs | Profit-Sharing Contingent Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 7 | 12 | 58 | 35
Operating Segments | Programs | Earned premium |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 23 | 12 | 52 | 34
Operating Segments | Wholesale Brokerage |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Investment Income, Nonoperating | 2 | 1 | 4 | 1
Other income, net | 0 | 0 | 0 | 0
Total revenues | 171 | 150 | 472 | 412
Operating Segments | Wholesale Brokerage | Base Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 129 | 121 | 369 | 336
Operating Segments | Wholesale Brokerage | Fee Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 26 | 21 | 71 | 59
Operating Segments | Wholesale Brokerage | Other Supplemental Commissions Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 2 | 1 | 6 | 3
Operating Segments | Wholesale Brokerage | Profit-Sharing Contingent Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 12 | 6 | 22 | 13
Operating Segments | Wholesale Brokerage | Earned premium |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 0 | 0 | 0 | 0
Other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Investment Income, Nonoperating | 21 | 12 | 47 | 26
Other income, net | 0 | 0 | 1 | 0
Total revenues | 21 | 11 | 47 | 23
Other | Base Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 0 | (1) | 0 | 0
Other | Fee Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 0 | 0 | (1) | (3)
Other | Other Supplemental Commissions Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 0 | 0 | 0 | 0
Other | Profit-Sharing Contingent Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 0 | 0 | 0 | 0
Other | Earned premium |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | $ 0 | $ 0 | $ 0 | $ 0

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