Fair Value Measurement - Fair Value of Financial Instruments Not Carried at Fair Value (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Carrying amount and estimated fair value financial instruments
Assets of consolidated investment vehicles (includes $5,067 and $5,363, at fair value)	$ 5,118	$ 5,493
Assets held for sale	227	0
Other assets (includes $140 and $148, at fair value)	557	597
Long-term debt	(1,676)	(1,675)
Liabilities of Consolidated Investments Vehicles	(4,458)	(4,625)
Liabilities held for sale	51	0
Other Liabilities	(402)	(457)
Carrying Amount
Carrying amount and estimated fair value financial instruments
Assets of consolidated investment vehicles (includes $5,067 and $5,363, at fair value)	64	46
Assets held for sale	10	0
Other assets (includes $140 and $148, at fair value)	101	92
Financial guaranty insurance contracts	(2,296)	(2,335)
Long-term debt	(1,676)	(1,675)
Liabilities of Consolidated Investments Vehicles	(102)	(170)
Liabilities held for sale	36	0
Other Liabilities	(33)	(43)
Estimated Fair Value
Carrying amount and estimated fair value financial instruments
Assets of consolidated investment vehicles (includes $5,067 and $5,363, at fair value)	64	46
Assets held for sale	10	0
Other assets (includes $140 and $148, at fair value)	102	93
Financial guaranty insurance contracts	(1,083)	(986)
Long-term debt	(1,497)	(1,477)
Liabilities of Consolidated Investments Vehicles	(102)	(170)
Liabilities held for sale	36	0
Other Liabilities	$ (33)	$ (43)