Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Allowance for credit loss	$ 69	$ 65
Amortized cost	7,359	7,707
Other invested assets fair value disclosure	27	30
Financial guaranty variable interest entities' assets	413	413
Assets of consolidated investment vehicles, fair value disclosure	5,067	5,363
Other assets, fair value disclosure	140	148
Financial guaranty variable interest entities' liabilities, with recourse	692	702
Financial guaranty variable interest entities' liabilities, without recourse	12	13
Liabilities of consolidated investment vehicles, fair value disclosure	$ 4,352	$ 4,431
Common stock par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	500,000,000	500,000,000
Common stock, shares issued (in shares)	59,274,112	59,013,040
Common stock, shares outstanding (in shares)	59,274,112	59,013,040
Accumulated other comprehensive income, tax provision	$ (69)	$ (84)