SEGMENT REPORTING - Earnings (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Segment Revenues	$ 4,815	$ 4,260	$ 3,977
Total segment compensation and benefits	(1,674)	(1,570)	(1,491)
Total segment facilities, technology and professional fees	(335)	(370)	(357)
Total segment travel and other operating expenses	(310)	(184)	(152)
Segment Earnings	2,496	2,136	1,977
Operating Segments
Segment Reporting Information [Line Items]
Segment Revenues	4,815	4,260	3,977
Total segment compensation and benefits	(1,674)	(1,570)	(1,491)
Total segment facilities, technology and professional fees	(335)	(370)	(357)
Total segment travel and other operating expenses	(310)	(184)	(152)
Segment Earnings	2,496	2,136	1,977
Operating Segments \| Infrastructure
Segment Reporting Information [Line Items]
Segment Revenues	967	907	950
Total segment compensation and benefits	(255)	(235)	(223)
Total segment facilities, technology and professional fees	(51)	(64)	(69)
Total segment travel and other operating expenses	(41)	(7)	(4)
Segment Earnings	620	601	654
Operating Segments \| Renewable power and transition
Segment Reporting Information [Line Items]
Segment Revenues	682	513	483
Total segment compensation and benefits	(168)	(132)	(116)
Total segment facilities, technology and professional fees	(28)	(26)	(23)
Total segment travel and other operating expenses	(35)	(9)	(8)
Segment Earnings	451	346	336
Operating Segments \| Private equity
Segment Reporting Information [Line Items]
Segment Revenues	450	470	475
Total segment compensation and benefits	(244)	(235)	(229)
Total segment facilities, technology and professional fees	(57)	(51)	(49)
Total segment travel and other operating expenses	(28)	(23)	(20)
Segment Earnings	121	161	177
Operating Segments \| Real estate
Segment Reporting Information [Line Items]
Segment Revenues	1,083	968	920
Total segment compensation and benefits	(364)	(340)	(360)
Total segment facilities, technology and professional fees	(75)	(93)	(98)
Total segment travel and other operating expenses	(41)	(28)	(34)
Segment Earnings	603	507	428
Operating Segments \| Credit
Segment Reporting Information [Line Items]
Segment Revenues	1,633	1,402	1,149
Total segment compensation and benefits	(643)	(628)	(563)
Total segment facilities, technology and professional fees	(124)	(136)	(118)
Total segment travel and other operating expenses	(165)	(117)	(86)
Segment Earnings	$ 701	$ 521	$ 382