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Business Combinations - Additional Information (Detail)
$ in Millions
 3 Months Ended
Aug. 18, 2025
USD ($)
segment
Mar. 31, 2026
USD ($)
acquisition
Mar. 31, 2025
USD ($)
acquisition
Business Combination [Line Items]      
Accretion of the discount on acquisition   $ 14 $ 13
Income (expense) related to net adjustments to estimated fair value of liability for earnout obligations   $ (3) $ (3)
Number of companies acquired | acquisition   51 28
Aggregate amount of maximum earnout obligations related to acquisitions   $ 1,385  
Aggregate amount of maximum earnout obligations related to acquisitions, recorded in consolidated balance sheet   651  
Aggregate amount of earnout obligation expected settlement in cash or stock at option   511  
Aggregate amount of earnout obligation expected settlement in cash   140  
Goodwill   201  
Expiration lists   162  
Non-compete agreements   13  
Total revenues   4,765 $ 3,740
Expiration Lists      
Business Combination [Line Items]      
Business acquisition not deductible for income tax purposes   137  
Non-Compete Agreements      
Business Combination [Line Items]      
Business acquisition not deductible for income tax purposes   13  
Brokerage      
Business Combination [Line Items]      
Write-off of amortizable intangible assets   1 $ 41
Brokerage Management      
Business Combination [Line Items]      
Goodwill   201  
Expiration lists   162  
Non-compete agreements   $ 13  
Minimum      
Business Combination [Line Items]      
Business combination, earnout payable evaluation period   2 years  
Minimum | Expiration Lists      
Business Combination [Line Items]      
Estimated useful lives of intangibles assets, years   2 years  
Minimum | Non-Compete Agreements      
Business Combination [Line Items]      
Estimated useful lives of intangibles assets, years   2 years  
Minimum | Trade Names      
Business Combination [Line Items]      
Estimated useful lives of intangibles assets, years   2 years  
Maximum      
Business Combination [Line Items]      
Business combination, earnout payable evaluation period   3 years  
Maximum | Expiration Lists      
Business Combination [Line Items]      
Estimated useful lives of intangibles assets, years   15 years  
Maximum | Non-Compete Agreements      
Business Combination [Line Items]      
Estimated useful lives of intangibles assets, years   6 years  
Maximum | Trade Names      
Business Combination [Line Items]      
Estimated useful lives of intangibles assets, years   15 years  
AssuredPartners, Inc      
Business Combination [Line Items]      
Gross consideration $ 13,800    
Number of employees | segment 10,900    
Business combination, initial accounting incomplete, adjustment of goodwill   $ 220  
AssuredPartners, Inc | Expiration Lists      
Business Combination [Line Items]      
Business combination, initial accounting incomplete, adjustment of intangible assets   (222)  
AssuredPartners, Inc | Trade Names      
Business Combination [Line Items]      
Business combination, initial accounting incomplete, adjustment of intangible assets   2  
Business Acquisition      
Business Combination [Line Items]      
Expiration lists   162  
Non-compete agreements   13  
Deferred tax liability   47  
Annualized revenue of business acquisitions   59  
Total revenues   7  
Net earnings   (3)  
Net earnings before interest, income taxes, depreciation, amortization and change in estimated acquisition earnout payables   $ 0  
2026 Acquisitions | Valuation, Market Approach | Measurement Input, Discount Rate | Minimum      
Business Combination [Line Items]      
Measurement input   0.050  
2026 Acquisitions | Valuation, Market Approach | Measurement Input, Discount Rate | Maximum      
Business Combination [Line Items]      
Measurement input   0.150  
2026 Acquisitions | Valuation, Income Approach | Measurement Input, Discount Rate      
Business Combination [Line Items]      
Measurement input   0.090  
2025 Acquisitions | Valuation, Market Approach | Measurement Input, Long-term Revenue Growth Rate | Minimum      
Business Combination [Line Items]      
Measurement input   0.030  
2025 Acquisitions | Valuation, Income Approach | Minimum      
Business Combination [Line Items]      
Attrition rate   5.00%  
2025 Acquisitions | Valuation, Income Approach | Maximum      
Business Combination [Line Items]      
Attrition rate   10.00%  
2025 Acquisitions | Valuation, Income Approach | Measurement Input, Long-term Revenue Growth Rate | Minimum      
Business Combination [Line Items]      
Measurement input   0.090  
2025 Acquisitions | Valuation, Income Approach | Measurement Input, Long-term Revenue Growth Rate | Maximum      
Business Combination [Line Items]      
Measurement input   0.100