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Business Combinations - Indefinite-Lived Intangible Assets Acquired as Part of Business Combination (Details) - Several Individually Immaterial Acquisitions - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Business Combination
Total Other identifiable intangibles	$ 777	$ 313
Client relationships
Business Combination
Total Other identifiable intangibles	596	257
Non-compete agreements
Business Combination
Total Other identifiable intangibles	2	7
Software and related assets
Business Combination
Total Other identifiable intangibles	121	10
Trademarks, trade names and other
Business Combination
Total Other identifiable intangibles	$ 7	6
Backlog
Business Combination
Amortization Period	4 years
Total Other identifiable intangibles	$ 45	28
Databases
Business Combination
Total Other identifiable intangibles	$ 6	$ 5
Minimum \| Client relationships
Business Combination
Amortization Period	9 years
Minimum \| Non-compete agreements
Business Combination
Amortization Period	2 years
Minimum \| Software and related assets
Business Combination
Amortization Period	2 years
Minimum \| Trademarks, trade names and other
Business Combination
Amortization Period	3 years
Minimum \| Backlog
Business Combination
Amortization Period	1 year
Minimum \| Databases
Business Combination
Amortization Period
Maximum \| Client relationships
Business Combination
Amortization Period	17 years
Maximum \| Non-compete agreements
Business Combination
Amortization Period	5 years
Maximum \| Software and related assets
Business Combination
Amortization Period	9 years
Maximum \| Trademarks, trade names and other
Business Combination
Amortization Period	5 years
Maximum \| Databases
Business Combination
Amortization Period	2 years