Fair Value Measurement - Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Assets of consolidated investment vehicles (includes $5,363 and $4,902, at fair value)	$ 5,493	$ 5,271
Other assets (includes $148 and $132, at fair value)	597	470
Long-term debt	(1,675)	(1,673)
Liabilities of CIVs	(4,625)	(4,436)
Other liabilities	(457)	(569)
Repurchase agreement liability	35	37
Carrying Amount
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Assets of consolidated investment vehicles (includes $5,363 and $4,902, at fair value)	46	171
Other assets (includes $148 and $132, at fair value)	92	134
Financial guaranty insurance contracts	(2,335)	(2,394)
Long-term debt	(1,675)	(1,673)
Liabilities of CIVs	(170)	(586)
Other liabilities	(43)	(45)
Estimated Fair Value
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Assets of consolidated investment vehicles (includes $5,363 and $4,902, at fair value)	46	171
Other assets (includes $148 and $132, at fair value)	93	135
Financial guaranty insurance contracts	(986)	(2,315)
Long-term debt	(1,477)	(1,832)
Liabilities of CIVs	(170)	(586)
Other liabilities	$ (43)	$ (45)