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Leases (Tables) | 12 Months Ended
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Dec. 31, 2021
Lessor, Operating Lease, Payments to be Received, Maturity [Table Text Block] | Future undiscounted lease payments to be received are as follows:
As of December 31, 2021 |  | Operating Leases
2022 |  | $ | 1 |
2023 |  | 1 |
2024 |  | 1 |
2025 |  | 1 |
2026 |  | 1 |
Thereafter |  | 4 |
Total lease receipts |  | $ | 10 |
Lease, Cost [Table Text Block] | The components of lease costs, net of sub-lessor income, is as follows:
Year Ended December 31, |  |  |  | 2021 |  | 2020
Operating lease cost |  |  |  | $ | 5 |  |  | $ | 4 |
Variable lease cost |  |  |  | — |  |  | — |
Sublease income |  |  |  | (1) |  |  | (1) |
Total lease cost |  |  |  | $ | 4 |  |  | $ | 4 |
Ambac is required to make variable lease payments under certain leases which primarily relates to variable costs of the lessor, such as taxes, insurance, maintenance and electricity. Supplemental information related to leases is as follows:
Year Ended December 31, |  | 2021 |  | 2020
Cash paid for amounts included in the measurement of operating lease liabilities |  | $ | 5 |  |  | $ | 4 |
Right-of-use assets obtained in exchange for operating lease liabilities (non-cash) |  | — |  |  | — |
Supplemental balance sheet information related to leases is as follows:
December 31, |  | 2021 |  | 2020
Operating leases: |  |  |  |
Operating lease right of use assets |  | $ | 23 |  |  | $ | 25 |
Operating lease liabilities |  | 28 |  |  | 30 |
Weighted average remaining lease term: |  |  |  |
Operating leases |  | 7.7 years |  | 8.7 years
Weighted average discount rate: |  |  |  |
Operating leases |  | 7.7 | % |  | 7.7 | %
Cash Flow, Supplemental Disclosures [Text Block] | Supplemental information related to leases is as follows:
Year Ended December 31, |  | 2021 |  | 2020
Cash paid for amounts included in the measurement of operating lease liabilities |  | $ | 5 |  |  | $ | 4 |
Right-of-use assets obtained in exchange for operating lease liabilities (non-cash) |  | — |  |  | — |
Lessee, Operating Lease, Liability, Maturity [Table Text Block] | Future undiscounted lease payments, gross of sublease receipts, to be made are as follows:
As of December 31, 2021 |  | Operating Leases
2022 |  | $ | 5 |
2023 |  | 5 |
2024 |  | 5 |
2025 |  | 5 |
2026 |  | 4 |
Thereafter |  | 14 |
Total lease payments |  | 37 |
Less: imputed interest |  | (9) |
Total |  | $ | 28 |
Schedule of Supplemental Cash Flow Information [Table Text Block] | Supplemental Disclosure of Cash Flow Information
Year Ended December 31, |  | 2021 |  | 2020 |  | 2019
Cash paid during the period for: |  |  |  |  |  |
Income taxes |  | $ | 15 |  |  | $ | 11 |  |  | $ | 21 |
Interest on long-term debt |  | 80 |  |  | 107 |  |  | 143 |
Non-cash investing and financing activities: |  |  |  |  |  |
Decrease in long-term debt as a result of surplus notes exchanges |  | 71 |  |  | — |  |  | — |
December 31, |  | 2021 |  | 2020 |  | 2019
Reconciliation of cash, cash equivalents, and restricted cash reported within the Consolidated Balance Sheets to the Consolidated Statements of Cash Flow: |  |  |  |  |  |
Cash and cash equivalents |  | $ | 17 |  |  | $ | 20 |  |  | $ | 24 |
Restricted cash |  | 5 |  |  | 13 |  |  | 55 |
Variable Interest Entity Restricted cash |  | 2 |  |  | 2 |  |  | 2 |
Total cash, cash equivalents, and restricted cash shown on the Consolidated Statements of Cash Flows |  | 23 |  |  | 35 |  |  | 81 |

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- Definition The entire disclosure for supplemental cash flow activities, including cash, noncash, and part noncash transactions, for the period. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -URI http://asc.fasb.org/topic&trid=2134446 + Details
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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 + Details
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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918701-209980 + Details
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- Definition Tabular disclosure of maturity of undiscounted cash flows to be received by lessor on annual basis for operating lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=124258985&loc=SL77919396-209981 + Details
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