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Parent Company - Condensed Statements of Operations and Comprehensive Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Condensed Income Statements, Captions [Line Items]      
Net investment income $ 269 $ 269 $ 297
Net realized investment gains (losses) (56) 15 18
Total revenues 723 848 1,115
Other expenses 167 179 197
Total expenses 536 465 729
Income (loss) before income taxes and equity in earnings (losses) of investees 187 383 386
Equity in earnings (losses) of investees (39) 94 27
Net income (loss) attributable to Assured Guaranty Ltd. 124 389 362
Other comprehensive income (loss) (815) (198) 156
Comprehensive income (loss) attributable to Assured Guaranty Ltd. (691) 191 518
Assured Guaranty Ltd. (Parent)      
Condensed Income Statements, Captions [Line Items]      
Net investment income 3 1 0
Net realized investment gains (losses) (4) 0 0
Total revenues (1) 1 0
Other expenses 45 35 34
Total expenses 45 35 34
Income (loss) before income taxes and equity in earnings (losses) of investees (46) (34) (34)
Equity in earnings (losses) of investees 170 423 396
Net income (loss) attributable to Assured Guaranty Ltd. 124 389 362
Other comprehensive income (loss) (815) (198) 156
Comprehensive income (loss) attributable to Assured Guaranty Ltd. $ (691) $ 191 $ 518