Fair Value Measurement - Fair Value of Financial Instruments Not Carried at Fair Value (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Carrying amount and estimated fair value financial instruments
Assets of consolidated investment vehicles (includes $4,978 and $5,363, at fair value)	$ 5,055	$ 5,493
Assets held for sale	221	0
Other assets (includes $141 and $148, at fair value)	580	597
Long-term debt	(1,677)	(1,675)
Liabilities of Consolidated Investments Vehicles	(4,460)	(4,625)
Liabilities held for sale	(50)	0
Other liabilities	(456)	(457)
Carrying Amount
Carrying amount and estimated fair value financial instruments
Assets of consolidated investment vehicles (includes $4,978 and $5,363, at fair value)	47	46
Assets held for sale	10	0
Other assets (includes $141 and $148, at fair value)	130	92
Financial guaranty insurance contracts	(2,291)	(2,335)
Long-term debt	(1,677)	(1,675)
Liabilities of Consolidated Investments Vehicles	(114)	(170)
Liabilities held for sale	(36)	0
Other liabilities	(66)	(43)
Estimated Fair Value
Carrying amount and estimated fair value financial instruments
Assets of consolidated investment vehicles (includes $4,978 and $5,363, at fair value)	47	46
Assets held for sale	10	0
Other assets (includes $141 and $148, at fair value)	131	93
Financial guaranty insurance contracts	(1,901)	(986)
Long-term debt	(1,491)	(1,477)
Liabilities of Consolidated Investments Vehicles	(114)	(170)
Liabilities held for sale	(36)	0
Other liabilities	$ (66)	$ (43)