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Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Statement of Comprehensive Income [Abstract]        
Net income (loss) $ 114 $ 176 $ 405 $ 370
Change in net unrealized gains (losses) on:        
Investments with no credit impairment, net of tax provision (benefit) of $12, $25, $29 and $16 37 152 174 111
Investments with credit impairment, net of tax provision (benefit) of $3, $3, $7 and $4 9 10 29 18
Change in net unrealized gains (losses) on investments 46 162 203 129
Change in instrument-specific credit risk on financial guaranty variable interest entities’ liabilities with recourse, net of tax provision (benefit) 1 (1) 1 (1)
Other, net of tax provision (benefit) 1 0 2 0
Other comprehensive income (loss) 48 161 206 128
Comprehensive income (loss) 162 337 611 498
Less: Comprehensive income (loss) attributable to noncontrolling interests 9 5 21 12
Comprehensive income (loss) attributable to Assured Guaranty Ltd. $ 153 $ 332 $ 590 $ 486