Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 113	$ 97
Change in net unrealized gains (losses) on:
Investments with no credit impairment, net of tax provision (benefit) of $(5) and $14	(29)	89
Investments with credit impairment, net of tax provision (benefit) of $0 and $1	1	5
Change in net unrealized gains (losses) on investments	(28)	94
Change in instrument-specific credit risk on financial guaranty variable interest entities’ liabilities with recourse, net of tax provision (benefit)	(1)	(1)
Other, net of tax provision (benefit)	1	2
Other comprehensive income (loss)	(28)	95
Comprehensive income (loss)	85	192
Less: Comprehensive income (loss) attributable to noncontrolling interests	4	16
Comprehensive income (loss) attributable to Assured Guaranty Ltd.	$ 81	$ 176