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Employment Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2019
Postemployment Benefits [Abstract] |
Schedule of Expected Benefit Payments [Table Text Block] | The following table sets forth projected benefit payments from Ambac’s postretirement plan over the next ten years for current retirees:
2020 |  | $ | — |
2021 |  | — |
2022 |  | — |
2023 |  | — |
2024 |  | 1 |
2025-2029 |  | 3 |
Total |  | $ | 5 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable [Table Text Block] | The amount of stock-based compensation expense and corresponding after-tax expense are as follows:
Year Ended December 31, | 2019 |  | 2018 |  | 2017
Stock options | $ | — |  |  | $ | — |  |  | $ | — |
Restricted stock units | 4 |  |  | 6 |  |  | 2 |
Performance awards (1) (2) | 8 |  |  | 6 |  |  | 3 |
Total stock-based compensation | $ | 12 |  |  | $ | 12 |  |  | $ | 4 |
Total stock-based compensation (after-tax) | $ | 12 |  |  | $ | 12 |  |  | $ | 4 |
(1) | Represents expense related to performance stock unit portion of performance awards. Certain performance awards are in the form of cash. Cash based compensation expense related to performance awards granted to US employees was $0, $1 and $2 for the years ended December 31, 2019, 2018 and 2017, respectively.
(2) A performance award issued to Ambac's former Chief Executive Officer in the form of performance stock units was expensed during 2018.
Share-based Payment Arrangement, Option, Activity [Table Text Block] | A summary of stock option activity for 2019 is as follows:
| Shares |  | Weighted Average Exercise Price |  | Aggregate Intrinsic Value |  | Weighted Average Remaining Contractual Life (in years)
Outstanding at beginning of period | 16,667 |  |  | $ | 20.63 |  |  |  |  |
Granted | — |  |  | — |  |  |  |  |
Exercised | — |  |  | — |  |  |  |  |
Forfeited or expired | — |  |  | — |  |  |  |  |
Outstanding at end of period | 16,667 |  |  | $ | 20.63 |  |  | $ | — |  |  | 0.97
Exercisable | 16,667 |  |  | $ | 20.63 |  |  | $ | — |  |  | 0.97
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] | A summary of RSU activity for 2019 is as follows:
| Shares |  | Weighted Average Grant Date Fair Value
Outstanding at beginning of period | 645,028 |  |  | $ | 17.17 |
Granted | 248,861 |  |  | 19.75 |
Delivered or returned to plan (1) | (189,832 | ) |  | 16.76 |
Forfeited | (1,478 | ) |  | 20.11 |
Outstanding at end of period | 702,579 |  |  | $ | 18.19 |
(1) | When restricted stock unit awards issued by Ambac become taxable compensation to employees, shares may be withheld to cover the employee’s withholding taxes. For the year ended December 31, 2019, Ambac purchased 72,977 of shares from employees that settled restricted stock units to meet the required tax withholdings.
Schedule of Nonvested Performance-based Units Activity [Table Text Block] | A summary of PSU activity for 2019 is as follows:
| Shares |  | Weighted Average Grant Date Fair Value
Outstanding at beginning of period | 516,999 |  |  | $ | 17.02 |
Granted (1) | 230,391 |  |  | 19.17 |
Delivered (2) | (166,353 | ) |  | 15.52 |
Forfeited (1) | (8,151 | ) |  | 18.11 |
Performance adjustment (3) | 77,326 |  |  | 15.52 |
Outstanding at end of period | 650,212 |  |  | $ | 17.98 |
(1) | Represents performance share units at 100% of units granted for LTIP Awards.
(2) | Reflects the number of performance shares attributable to the performance goals attained over the completed performance period and for which service conditions have been met. When performance stock unit awards issued by Ambac become taxable compensation to employees, shares may be withheld to cover the employee’s withholding taxes. For the year ended December 31, 2019, Ambac purchased 64,086 of shares from employees that settled performance based restricted stock units to meet the required tax withholdings.
(3) Represents the increase (decrease) in shares issued for awards granted in 2016 based upon the attainment of performance metrics at the end of the performance period.

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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for exercisable or convertible options that are fully vested and expected to vest. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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