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Contracts with Customers - Summary of Changes in Deferred Revenue Balances (Detail)
$ in Millions
 3 Months Ended
Mar. 31, 2026
USD ($)
Change in Contract with Customer, Liability [Roll Forward]  
Deferred revenue beginning balance $ 892
Incremental deferred revenue 379
Revenue recognized during the three-month period ended March 31, 2026 included in deferred revenue at December 31, 2025 (272)
Net change in collected billings/deposits received from customers (20)
Impact of change in foreign exchange rates 0
Deferred revenue recognized from business acquisitions 7
Deferred revenue ending balance 986
Brokerage  
Change in Contract with Customer, Liability [Roll Forward]  
Deferred revenue beginning balance 693
Incremental deferred revenue 353
Revenue recognized during the three-month period ended March 31, 2026 included in deferred revenue at December 31, 2025 (248)
Net change in collected billings/deposits received from customers (26)
Impact of change in foreign exchange rates (1)
Deferred revenue recognized from business acquisitions 7
Deferred revenue ending balance 778
Risk Management  
Change in Contract with Customer, Liability [Roll Forward]  
Deferred revenue beginning balance 199
Incremental deferred revenue 26
Revenue recognized during the three-month period ended March 31, 2026 included in deferred revenue at December 31, 2025 (24)
Net change in collected billings/deposits received from customers 6
Impact of change in foreign exchange rates 1
Deferred revenue recognized from business acquisitions 0
Deferred revenue ending balance $ 208