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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 | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Significant non-cash investing and financing activities |  |
Other payable issued for agency acquisitions and purchased customer accounts | $ 2 | $ 0
Estimated acquisition earn-out payables issued for agency acquisitions | $ 9 | $ 20

X
- Definition Other payable issued for agency acquisitions and purchased customer accounts. + References No definition available. + Details
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Period Type: | duration

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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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