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Parent Company - Condensed Statement of Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Net income | $ 376 | $ 739 | $ 124
Equity in earnings (losses) of investees | (62) | (28) | 39
Net realized investment gains (losses) | (9) | 14 | 56
Net cash flows provided by (used in) operating activities | 47 | 461 | (2,479)
Maturities and paydowns | 853 | 746 | 682
Sales | 0 | 4 | 0
Maturities and paydowns | 5 | 36 | 36
Net sales (purchases) of short-term investments with original maturities of less than three months | 437 | (872) | 439
Net cash flows provided by (used in) investing activities | 780 | 286 | 1,740
Dividends paid | (68) | (67) | (64)
Repurchases of common shares | (502) | (199) | (500)
Payments related to tax withholding for share-based compensation | (30) | (20) | (14)
Other | 2 | 1 | 8
Net cash flows provided by (used in) financing activities | (983) | (670) | 612
Increase (decrease) in cash and cash equivalents and restricted cash | (158) | 79 | (135)
Cash and cash equivalents and restricted cash at beginning of period | 286 | 207 | 342
Cash and cash equivalents and restricted cash at end of period | 128 | 286 | 207
Cash | 121 | 97 | 107
Restricted cash (included in other assets) | 5 | 0 | 1
Cash and cash equivalents and restricted cash at the end of period | 128 | 286 | 207
Assured Guaranty Ltd. (Parent) |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Net income | 376 | 739 | 124
Equity in earnings (losses) of investees | (416) | (784) | (170)
Net realized investment gains (losses) | 0 | 1 | 4
Cash dividends from subsidiaries | 637 | 306 | 437
Other | 28 | 36 | 32
Net cash flows provided by (used in) operating activities | 625 | 298 | 427
Maturities and paydowns | 3 | 0 | 0
Sales | 0 | 4 | 52
Maturities and paydowns | 0 | 0 | 5
Net sales (purchases) of short-term investments with original maturities of less than three months | (29) | (18) | 92
Net cash flows provided by (used in) investing activities | (26) | (14) | 149
Dividends paid | (68) | (67) | (64)
Repurchases of common shares | (502) | (199) | (500)
Payments related to tax withholding for share-based compensation | (30) | (20) | (14)
Other | 2 | 2 | 2
Net cash flows provided by (used in) financing activities | (598) | (284) | (576)
Increase (decrease) in cash and cash equivalents and restricted cash | 1 | 0 | 0
Cash and cash equivalents and restricted cash at beginning of period | 0 | 0 | 0
Cash and cash equivalents and restricted cash at end of period | 1 | 0 | 0
Cash | 0 | 0 | 0
Restricted cash (included in other assets) | 1 | 0 | 0
Cash and cash equivalents and restricted cash at the end of period | $ 1 | $ 0 | $ 0

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