Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Allowance for credit loss	$ 65	$ 42
Amortized Cost	7,707	7,822
Other invested assets, fair value disclosure	30	31
Financial Guaranty variable interest entities assets	413	260
Assets of consolidated investment vehicles, fair value disclosure	5,363	4,902
Other assets, fair value disclosure	148	132
Financial guaranty variable interest entities' liabilities, with recourse	702	269
Financial guaranty variable interest entities' liabilities, without recourse	13	20
Liabilities of consolidated investment vehicles, fair value disclosure	$ 4,431	$ 3,849
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)	59,013,040	67,518,424
Common stock, shares outstanding (in shares)	59,013,040	67,518,424
Accumulated other comprehensive income, tax provision	$ (84)	$ 60