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Financial Guarantee Insurance Contracts - Summary of Information Related to Policies Currently Included in Ambac's Loss Reserves or Subrogation Recoverable (Details)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
Policies
Dec. 31, 2020
USD ($)
Policies
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Loss Reserves Ceded To Reinsurers $ 29 $ 33 $ 36 $ 26
Ceded Loss And Loss Expenses Paid Not Yet Recovered $ 1 $ 1 $ 1  
Number of policies | Policies 213 232    
Remaining weighted-average contract period (in years) 14 years 14 years    
Gross insured contractual payments outstanding:        
Principal $ 6,538 $ 7,573    
Interest 3,057 3,443    
Total 9,595 11,016    
Gross undiscounted claim liability 2,136 2,395    
Discount, gross claim liability 317 303    
Gross claim liability before all subrogation and before reinsurance 1,819 2,092    
Less:        
Gross RMBS subrogation (1,733) (1,753)    
Discount, RMBS subrogation 2 3    
Discounted RMBS subrogation, before reinsurance (1,731) (1,751)    
Less:        
Gross other subrogation (651) (755)    
Discount, other subrogation 27 20    
Discounted other subrogation, before reinsurance (624) (735)    
Gross claim liability, net of all subrogation and discounts, before reinsurance (537) (394)    
Less: Unearned premium reserves (58) (72)    
Plus: Loss adjustment expenses reserves 46 68    
Claim liability reported on Balance Sheet, before reinsurance (549) (397)    
Reinsurance recoverable reported on Balance Sheet $ 29 $ 33    
I/SL [Member]        
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Number of policies | Policies 33 40    
Remaining weighted-average contract period (in years) 11 years 10 years    
Gross insured contractual payments outstanding:        
Principal $ 823 $ 842    
Interest 328 279    
Total 1,151 1,121    
Gross undiscounted claim liability 4 3    
Discount, gross claim liability 0 0    
Gross claim liability before all subrogation and before reinsurance 4 3    
Less:        
Gross RMBS subrogation 0 0    
Discount, RMBS subrogation 0 0    
Discounted RMBS subrogation, before reinsurance 0 0    
Less:        
Gross other subrogation 0 0    
Discount, other subrogation 0 0    
Discounted other subrogation, before reinsurance 0 0    
Gross claim liability, net of all subrogation and discounts, before reinsurance 4 3    
Less: Unearned premium reserves (2) (2)    
Plus: Loss adjustment expenses reserves 1 1    
Claim liability reported on Balance Sheet, before reinsurance 2 2    
Reinsurance recoverable reported on Balance Sheet $ 1 $ 0    
IA [Member]        
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Number of policies | Policies 15 25    
Remaining weighted-average contract period (in years) 12 years 18 years    
Gross insured contractual payments outstanding:        
Principal $ 764 $ 1,375    
Interest 800 1,011    
Total 1,564 2,386    
Gross undiscounted claim liability 13 49    
Discount, gross claim liability 0 2    
Gross claim liability before all subrogation and before reinsurance 12 47    
Less:        
Gross RMBS subrogation 0 0    
Discount, RMBS subrogation 0 0    
Discounted RMBS subrogation, before reinsurance 0 0    
Less:        
Gross other subrogation (6) 0    
Discount, other subrogation 0 0    
Discounted other subrogation, before reinsurance (6) 0    
Gross claim liability, net of all subrogation and discounts, before reinsurance 7 47    
Less: Unearned premium reserves (7) (16)    
Plus: Loss adjustment expenses reserves 0 2    
Claim liability reported on Balance Sheet, before reinsurance 0 32    
Reinsurance recoverable reported on Balance Sheet $ 1 $ 6    
II [Member]        
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Number of policies | Policies 13 15    
Remaining weighted-average contract period (in years) 14 years 8 years    
Gross insured contractual payments outstanding:        
Principal $ 694 $ 595    
Interest 417 484    
Total 1,111 1,079    
Gross undiscounted claim liability 56 40    
Discount, gross claim liability 3 1    
Gross claim liability before all subrogation and before reinsurance 53 40    
Less:        
Gross RMBS subrogation 0 0    
Discount, RMBS subrogation 0 0    
Discounted RMBS subrogation, before reinsurance 0 0    
Less:        
Gross other subrogation 0 0    
Discount, other subrogation 0 0    
Discounted other subrogation, before reinsurance 0 0    
Gross claim liability, net of all subrogation and discounts, before reinsurance 53 39    
Less: Unearned premium reserves (9) (5)    
Plus: Loss adjustment expenses reserves 1 1    
Claim liability reported on Balance Sheet, before reinsurance 45 35    
Reinsurance recoverable reported on Balance Sheet $ 12 $ 9    
III [Member]        
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Number of policies | Policies 15 15    
Remaining weighted-average contract period (in years) 15 years 16 years    
Gross insured contractual payments outstanding:        
Principal $ 1,349 $ 1,469    
Interest 177 215    
Total 1,525 1,685    
Gross undiscounted claim liability 550 541    
Discount, gross claim liability 115 85    
Gross claim liability before all subrogation and before reinsurance 435 456    
Less:        
Gross RMBS subrogation 0 0    
Discount, RMBS subrogation 0 0    
Discounted RMBS subrogation, before reinsurance 0 0    
Less:        
Gross other subrogation (34) (36)    
Discount, other subrogation 2 1    
Discounted other subrogation, before reinsurance (32) (35)    
Gross claim liability, net of all subrogation and discounts, before reinsurance 403 421    
Less: Unearned premium reserves (14) (17)    
Plus: Loss adjustment expenses reserves 5 5    
Claim liability reported on Balance Sheet, before reinsurance 393 409    
Reinsurance recoverable reported on Balance Sheet $ 24 $ 24    
IV [Member]        
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Number of policies | Policies 132 132    
Remaining weighted-average contract period (in years) 13 years 14 years    
Gross insured contractual payments outstanding:        
Principal $ 2,868 $ 3,246    
Interest 1,311 1,427    
Total 4,178 4,673    
Gross undiscounted claim liability 1,450 1,690    
Discount, gross claim liability 194 213    
Gross claim liability before all subrogation and before reinsurance 1,255 1,477    
Less:        
Gross RMBS subrogation (1,733) (1,753)    
Discount, RMBS subrogation 2 3    
Discounted RMBS subrogation, before reinsurance (1,731) (1,751)    
Less:        
Gross other subrogation (599) (706)    
Discount, other subrogation 23 18    
Discounted other subrogation, before reinsurance (576) (689)    
Gross claim liability, net of all subrogation and discounts, before reinsurance (1,052) (963)    
Less: Unearned premium reserves (25) (30)    
Plus: Loss adjustment expenses reserves 38 59    
Claim liability reported on Balance Sheet, before reinsurance (1,039) (933)    
Reinsurance recoverable reported on Balance Sheet $ (9) $ (6)    
V [Member]        
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Number of policies | Policies 5 5    
Remaining weighted-average contract period (in years) 7 years 7 years    
Gross insured contractual payments outstanding:        
Principal $ 40 $ 47    
Interest 24 26    
Total 64 72    
Gross undiscounted claim liability 64 72    
Discount, gross claim liability 4 3    
Gross claim liability before all subrogation and before reinsurance 60 69    
Less:        
Gross RMBS subrogation 0 0    
Discount, RMBS subrogation 0 0    
Discounted RMBS subrogation, before reinsurance 0 0    
Less:        
Gross other subrogation (12) (12)    
Discount, other subrogation 2 1    
Discounted other subrogation, before reinsurance (10) (11)    
Gross claim liability, net of all subrogation and discounts, before reinsurance 50 58    
Less: Unearned premium reserves (1) (1)    
Plus: Loss adjustment expenses reserves 0 0    
Claim liability reported on Balance Sheet, before reinsurance 49 57    
Reinsurance recoverable reported on Balance Sheet $ 0 $ 0