Business Combinations - Indefinite-Lived Intangible Assets Acquired as Part of Business Combination (Details) - Several Individually Immaterial Acquisitions $ in Millions	9 Months Ended
Sep. 30, 2026 USD ($)
Business Combination [Line Items]
Total Other identifiable intangibles	$ 233
Customer relationships
Business Combination [Line Items]
Total Other identifiable intangibles	160
Backlog
Business Combination [Line Items]
Total Other identifiable intangibles	8
Software and related assets
Business Combination [Line Items]
Total Other identifiable intangibles	32
Trade names and related assets
Business Combination [Line Items]
Total Other identifiable intangibles	28
Non-compete agreements
Business Combination [Line Items]
Total Other identifiable intangibles	3
Databases
Business Combination [Line Items]
Total Other identifiable intangibles	$ 2
Minimum \| Customer relationships
Business Combination [Line Items]
Amortization Period	10 years
Minimum \| Backlog
Business Combination [Line Items]
Amortization Period	1 year
Minimum \| Software and related assets
Business Combination [Line Items]
Amortization Period	3 years
Minimum \| Trade names and related assets
Business Combination [Line Items]
Amortization Period	2 years
Maximum \| Customer relationships
Business Combination [Line Items]
Amortization Period	15 years
Maximum \| Backlog
Business Combination [Line Items]
Amortization Period	4 years
Maximum \| Software and related assets
Business Combination [Line Items]
Amortization Period	9 years
Maximum \| Trade names and related assets
Business Combination [Line Items]
Amortization Period	12 years
Maximum \| Non-compete agreements
Business Combination [Line Items]
Amortization Period	3 years
Maximum \| Databases
Business Combination [Line Items]
Amortization Period	3 years

Weighted-average period of amortization for finite-lived intangible asset acquired in business combination, asset acquisition, and from joint venture formation, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Excludes goodwill and capitalized cost for software to be sold, leased, or marketed.

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Amount of identifiable finite-lived intangible asset acquired in business combination and recognized at acquisition date.

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