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Acquisitions - Summary of Preliminary Estimate of Trademark Acquired (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Nov. 01, 2021
Business Acquisition [Line Items]
Gross Carrying Amount	$ 379	$ 372
Turner & Townsend | Customer relationships
Business Acquisition [Line Items]
Amount Assigned at Acquisition Date			$ 754
Turner & Townsend | Customer relationships | Minimum
Business Acquisition [Line Items]
Amortization Period	5 years
Turner & Townsend | Customer relationships | Maximum
Business Acquisition [Line Items]
Amortization Period	11 years
Turner & Townsend | Backlog
Business Acquisition [Line Items]
Amount Assigned at Acquisition Date			75
Turner & Townsend | Backlog | Minimum
Business Acquisition [Line Items]
Amortization Period	2 years
Turner & Townsend | Backlog | Maximum
Business Acquisition [Line Items]
Amortization Period	4 years
Turner & Townsend | Trademark
Business Acquisition [Line Items]
Trademark, Amount Assigned at Acquisition Date			$ 276

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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