Fair Value Measurement - Fair Value of Financial Instruments Not Carried at Fair Value (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Carrying amount and estimated fair value financial instruments
Assets of consolidated investment vehicles (includes $318 and $5,363, at fair value)	$ 330	$ 5,493
Other assets (includes $112 and $148, at fair value)	549	597
Long-term debt	(1,693)	(1,675)
Liabilities of CIVs	(4)	(4,625)
Other liabilities	(393)	(457)
Carrying Amount
Carrying amount and estimated fair value financial instruments
Assets of consolidated investment vehicles (includes $318 and $5,363, at fair value)	21	46
Other assets (includes $112 and $148, at fair value)	106	92
Financial guaranty insurance contracts	(2,280)	(2,335)
Long-term debt	(1,693)	(1,675)
Liabilities of CIVs	(4)	(170)
Other liabilities	(17)	(43)
Estimated Fair Value
Carrying amount and estimated fair value financial instruments
Assets of consolidated investment vehicles (includes $318 and $5,363, at fair value)	21	46
Other assets (includes $112 and $148, at fair value)	107	93
Financial guaranty insurance contracts	(1,712)	(986)
Long-term debt	(1,477)	(1,477)
Liabilities of CIVs	(4)	(170)
Other liabilities	$ (17)	$ (43)