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Employment Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2020
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:
2021$— 
2022— 
2023— 
2024— 
20251 
2025-20293 
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,
202020192018
Stock options
$— $— $— 
Restricted stock units
3 4 6 
Performance awards 8 8 6 
Total stock-based compensation
$11 $12 $12 
Total stock-based compensation (after-tax)
$11 $12 $12 
Share-based Payment Arrangement, Option, Activity [Table Text Block] A summary of stock option activity for 2020 is as follows:
SharesWeighted
Average
Exercise
Price		Aggregate
Intrinsic
Value		Weighted
Average
Remaining
Contractual
Life
(in years)
Outstanding at beginning of period16,667 $20.63 
Granted
— — 
Exercised
— — 
Forfeited or expired
(16,667)20.63 
Outstanding at end of period
— $— $— 0.00
Exercisable
— $— $— 0.00
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]
A summary of RSU activity for 2020 is as follows:
Shares
Weighted Average
Grant Date
Fair Value
Outstanding at beginning of period702,579 $18.19 
Granted297,517 17.36 
Delivered or returned to plan (1)
(224,829)17.59 
Forfeited(1,610)19.19 
Outstanding at end of period773,657 $18.04 
(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, 2020, Ambac purchased 85,654 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 2020 is as follows:
Shares
Weighted Average
Grant Date
Fair Value
Outstanding at beginning of period650,212 $17.98 
Granted (1)
331,184 19.99 
Delivered (2)
(184,896)22.35 
Forfeited(6,071)18.00 
Performance adjustment (3)
54,085 22.35 
Outstanding at end of period844,514 $18.09 
(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, 2020, Ambac purchased 70,340 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 2017 based upon the attainment of performance metrics at the end of the performance period.