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The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

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Amount of liability recognized arising from contingent consideration in a business combination.

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Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled within one year or the normal operating cycle, if longer.

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Acquisitions - Narrative (Details) - USD ($)	Nov. 04, 2025	Jun. 30, 2026	Dec. 31, 2025	Jan. 16, 2025	Jan. 01, 2025	Feb. 23, 2024
Business Combination [Line Items]
Contingent consideration		$ 34,000,000	$ 65,000,000
Project Management \| Turner & Townsend
Business Combination [Line Items]
Equity method investments in unconsolidated subsidiaries, variations in ownership percentage					70.00%
5.500% senior notes due 2029 \| Senior notes
Business Combination [Line Items]
Aggregate principal amount						$ 500,000,000
Interest rate						5.50%
Pearce Services, LLC
Business Combination [Line Items]
Equity interest percentage	100.00%
Contingent consideration, current	$ 31,000,000
Deferred consideration, discount	101,000,000
Goodwill deductible amount		106,000,000
Pearce Services, LLC \| Deferred Consideration
Business Combination [Line Items]
Contingent consideration, current	115,000,000
Pearce Services, LLC \| Contingent Earnout Payment
Business Combination [Line Items]
Contingent consideration	115,000,000
Pearce Services, LLC \| 5.500% senior notes due 2029 \| Senior notes
Business Combination [Line Items]
Aggregate principal amount	$ 750,000,000
Interest rate	4.90%
Industrious
Business Combination [Line Items]
Equity interest percentage				60.00%
Goodwill deductible amount		440,000,000
Industrious \| Global Workplace Solutions
Business Combination [Line Items]
Equity interest percentage				100.00%
Turner & Townsend \| Project Management
Business Combination [Line Items]
Equity interest percentage					10.00%
Estimated based on discounted forecasted cash flows		$ 454,000,000	$ 433,000,000