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Revenues - Schedule of Disaggregated by Revenue (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] |  |  |  |
Investment Income, Nonoperating | $ 35 | $ 22 | $ 53 | $ 40
Other income, net | 1 | 2 | 2 | 5
Total revenues | 1,285 | 1,178 | 2,689 | 2,435
Base Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 878 | 821 | 1,836 | 1,687
Fee Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 268 | 240 | 533 | 463
Other Supplemental Commissions Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 41 | 39 | 141 | 130
Profit-Sharing Contingent Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 45 | 36 | 88 | 82
Earned premium |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 17 | 18 | 36 | 28
Operating Segments |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues | 1,260 | 1,164 | 2,654 | 2,410
Operating Segments | Retail |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Investment Income, Nonoperating | 3 | 1 | 4 | 2
Other income, net | 0 | 1 | 1 | 2
Total revenues | 697 | 646 | 1,604 | 1,452
Operating Segments | Retail | Base Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 483 | 449 | 1,099 | 996
Operating Segments | Retail | Fee Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 173 | 156 | 350 | 312
Operating Segments | Retail | Other Supplemental Commissions Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 31 | 32 | 128 | 119
Operating Segments | Retail | Profit-Sharing Contingent Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 7 | 7 | 22 | 21
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 | 5 | 11 | 10
Other income, net | 1 | 1 | 1 | 2
Total revenues | 381 | 359 | 709 | 657
Operating Segments | Programs | Base Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 254 | 243 | 473 | 449
Operating Segments | Programs | Fee Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 66 | 61 | 131 | 110
Operating Segments | Programs | Other Supplemental Commissions Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 7 | 6 | 8 | 7
Operating Segments | Programs | Profit-Sharing Contingent Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 30 | 25 | 49 | 51
Operating Segments | Programs | Earned premium |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 17 | 18 | 36 | 28
Operating Segments | Wholesale Brokerage |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Investment Income, Nonoperating | 1 | 1 | 2 | 2
Other income, net | 0 | 0 | 0 | 0
Total revenues | 182 | 159 | 341 | 301
Operating Segments | Wholesale Brokerage | Base Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 141 | 129 | 264 | 242
Operating Segments | Wholesale Brokerage | Fee Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 29 | 24 | 53 | 43
Operating Segments | Wholesale Brokerage | Other Supplemental Commissions Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 3 | 1 | 5 | 4
Operating Segments | Wholesale Brokerage | Profit-Sharing Contingent Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 8 | 4 | 17 | 10
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 | 25 | 15 | 36 | 26
Other income, net | 0 | 0 | 0 | 1
Total revenues | 25 | 14 | 35 | 25
Other | Base Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 0 | (0) | 0 | 0
Other | Fee Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 0 | (1) | (1) | (2)
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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