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Parent Company - Condensed Statements of Operations and Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Condensed Income Statements, Captions [Line Items] |  |  |
Net investment income | $ 340 | $ 365 | $ 269
Net realized investment gains (losses) | 9 | (14) | (56)
Total revenues | 872 | 1,373 | 723
Other expenses | 159 | 217 | 167
Total expenses | 446 | 733 | 536
Income (loss) before income taxes and equity in earnings (losses) of investees | 426 | 640 | 187
Equity in earnings (losses) of investees | 62 | 28 | (39)
Net income (loss) attributable to Assured Guaranty Ltd. | 376 | 739 | 124
Other comprehensive income (loss) | (26) | 156 | (815)
Comprehensive income (loss) attributable to Assured Guaranty Ltd. | 350 | 895 | (691)
Assured Guaranty Ltd. (Parent) |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |
Net investment income | 2 | 1 | 3
Net realized investment gains (losses) | 0 | (1) | (4)
Total revenues | 2 | 0 | (1)
Other expenses | 42 | 45 | 45
Total expenses | 42 | 45 | 45
Income (loss) before income taxes and equity in earnings (losses) of investees | (40) | (45) | (46)
Equity in earnings (losses) of investees | 416 | 784 | 170
Net income (loss) attributable to Assured Guaranty Ltd. | 376 | 739 | 124
Other comprehensive income (loss) | (26) | 156 | (815)
Comprehensive income (loss) attributable to Assured Guaranty Ltd. | $ 350 | $ 895 | $ (691)

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