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v3.25.2

Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities - Summary of Significant Non-Cash Investing and Financing Activities (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Significant non-cash investing and financing activities |  |
Other payable issued for agency acquisitions and purchased customer accounts | $ 10 | $ 7
Estimated acquisition earn-out payables issued for agency acquisitions | $ 17 | $ 19

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- Definition Recorded Earn-out Payable + References No definition available. + Details
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Namespace Prefix: | bro_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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