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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

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