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Schedule II - Condensed Financial Information of Registrant (Parent Company Only) - Condensed Statements of Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Cash flows from operating activities: |  |  |
Net income (loss) | $ (16) | $ (437) | $ (216)
Adjustments to reconcile net income loss to net cash used in operating activities: |  |  |
Accretion (Amortization) of Discounts and Premiums, Investments | (13) | (15) | (63)
Net realized investment gains | (7) | (22) | (81)
Decrease in current income taxes payable | (4) | 17 | 35
Share-based compensation | 14 | 11 | 12
Proceeds from Contributions from Affiliates | 6 |  |
Other, net | (35) | 59 | 79
Net cash used in operating activities | (131) | (175) | (311)
Cash flows from investing activities: |  |  |
Proceeds from matured bonds | 698 | 137 | 379
Purchases of bonds | (343) | (975) | (959)
Change in short-term investments | 98 | 158 | (218)
Proceeds from Sale and Maturity of Other Investments | 39 | 374 | 81
Payments for (Proceeds from) Other Investing Activities | (5) | 1 | (2)
Net cash provided by investing activities | 776 | 432 | 1,000
AMPS Proceeds | 0 | 0 | 19
Cash flows from financing activities: |  |  |
Net Cash Provided by (Used in) Financing Activities | (657) | (303) | (691)
Cash and cash equivalents at beginning of period | 20 | 24 |
Cash and cash equivalents end of period | 17 | 20 | 24
Cash paid during the period for: |  |  |
Income taxes | 15 | 11 | 21
Payments to Acquire Businesses, Net of Cash Acquired |  | (74) |
Ambac Financial Group, Inc Parent Company Only [Member] |  |  |
Cash flows from operating activities: |  |  |
Net income (loss) | (17) | (437) | (216)
Adjustments to reconcile net income loss to net cash used in operating activities: |  |  |
Equity in undistributed net (income) loss of non-debtor subsidiaries | 1 | 423 | 223
Accretion (Amortization) of Discounts and Premiums, Investments | (9) | (6) | (6)
Net realized investment gains | 5 | 1 | 2
Decrease in current income taxes payable | 1 | 30 | 15
Share-based compensation | 14 | 11 | 12
Decrease in other assets | (5) | (1) | (8)
Other, net | (6) | (10) | (6)
Net cash used in operating activities | (10) | 11 | 16
Cash flows from investing activities: |  |  |
Proceeds from matured bonds | 33 | 46 | 86
Purchases of bonds | (34) | (45) | (2)
Change in short-term investments | 105 | 89 | (125)
Proceeds from Sale and Maturity of Other Investments | (8) | 0 | 0
Net cash provided by investing activities | 95 | 16 | (22)
Capital Contribution to Subsidiaries | (92) | (29) | 0
AMPS Proceeds | 0 | 0 | 19
Cash flows from financing activities: |  |  |
Net Cash Provided by (Used in) Financing Activities | (92) | (29) | 0
Cash and Cash Equivalents, Period Increase (Decrease) | (6) | (2) | (6)
Cash and cash equivalents at beginning of period | 7 | 9 | 15
Cash and cash equivalents end of period | 1 | 7 | 9
Cash paid during the period for: |  |  |
Income taxes | 0 | 0 | $ 1
Payments to Acquire Businesses, Net of Cash Acquired |  | $ (74) |
Parent [Member] |  |  |
Adjustments to reconcile net income loss to net cash used in operating activities: |  |  |
Net realized investment gains | $ (4) |  |

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