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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Changes in Goodwill by Segment
The following table summarizes the changes in the carrying amount of goodwill for the years ended December 31, 2024 and 2023 (dollars in millions):
Advisory
Services		Global
Workplace
Solutions		Real Estate
Investments		Total
Balance as of December 31, 2022
Goodwill$3,283 $2,110 $595 $5,988 
Accumulated impairment losses(762)(175)(183)(1,120)
2,521 1,935 412 4,868 
Acquisitions91 93 3 187 
Foreign exchange movement9 57 8 74 
Balance as of December 31, 2023
Goodwill3,383 2,260 606 6,249 
Accumulated impairment losses(762)(175)(183)(1,120)
2,621 2,085 423 5,129 
Acquisitions8 589 — 597 
Foreign exchange movement(33)(60)(12)(105)
Balance as of December 31, 2024
Goodwill3,358 2,789 594 6,741 
Accumulated impairment losses(762)(175)(183)(1,120)
$2,596 $2,614 $411 $5,621 
Schedule of Indefinite-Lived Intangible Assets
Other intangible assets totaled $2.3 billion, net of accumulated amortization of $2.5 billion as of December 31, 2024, and $2.1 billion, net of accumulated amortization of $2.2 billion as of December 31, 2023 and are comprised of the following (dollars in millions):
December 31,
20242023
Gross
Carrying
Amount		Accumulated
Amortization		Gross
Carrying
Amount		Accumulated
Amortization
Unamortizable intangible assets:
Management contracts$58 $62 
Trademarks309 317 
367 379 
Amortizable intangible assets:
Customer relationships2,021 $(1,031)1,727 $(893)
Mortgage servicing rights1,134 (648)1,055 (556)
Trademarks/Trade names342 (177)315 (147)
Management contracts133 (133)122 (121)
Other795 (505)662 (462)
4,425 (2,494)3,881 (2,179)
Total intangible assets$4,792 $(2,494)$4,260 $(2,179)
Schedule of Finite-Lived Intangible Assets
Other intangible assets totaled $2.3 billion, net of accumulated amortization of $2.5 billion as of December 31, 2024, and $2.1 billion, net of accumulated amortization of $2.2 billion as of December 31, 2023 and are comprised of the following (dollars in millions):
December 31,
20242023
Gross
Carrying
Amount		Accumulated
Amortization		Gross
Carrying
Amount		Accumulated
Amortization
Unamortizable intangible assets:
Management contracts$58 $62 
Trademarks309 317 
367 379 
Amortizable intangible assets:
Customer relationships2,021 $(1,031)1,727 $(893)
Mortgage servicing rights1,134 (648)1,055 (556)
Trademarks/Trade names342 (177)315 (147)
Management contracts133 (133)122 (121)
Other795 (505)662 (462)
4,425 (2,494)3,881 (2,179)
Total intangible assets$4,792 $(2,494)$4,260 $(2,179)