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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
 3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
Policies
Dec. 31, 2020
USD ($)
Policies
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Loss Reserves Ceded To Reinsurers $ 33 $ 33 $ 35 $ 26
Ceded Loss And Loss Expenses Paid Not Yet Recovered $ 0 $ 1 $ 1  
Number of policies | Policies 229 232    
Remaining weighted-average contract period (in years) 15 years 14 years    
Gross insured contractual payments outstanding:        
Principal $ 7,087 $ 7,573    
Interest 3,413 3,443    
Total 10,500 11,016    
Gross undiscounted claim liability 2,245 2,395    
Discount, gross claim liability 372 303    
Gross claim liability before all subrogation and before reinsurance 1,872 2,092    
Less:        
Gross RMBS subrogation (1,749) (1,753)    
Discount, RMBS subrogation 2 3    
Discounted RMBS subrogation, before reinsurance (1,748) (1,751)    
Less:        
Gross other subrogation (559) (755)    
Discount, other subrogation 30 20    
Discounted other subrogation, before reinsurance (530) (735)    
Gross claim liability, net of all subrogation and discounts, before reinsurance (405) (394)    
Less: Unearned premium reserves (67) (72)    
Plus: Loss adjustment expenses reserves 57 68    
Claim liability reported on Balance Sheet, before reinsurance (414) (397)    
Reinsurance recoverable reported on Balance Sheet $ 33 $ 33    
I/SL [Member]        
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Number of policies | Policies 36 40    
Remaining weighted-average contract period (in years) 10 years 10 years    
Gross insured contractual payments outstanding:        
Principal $ 738 $ 842    
Interest 255 279    
Total 994 1,121    
Gross undiscounted claim liability 3 3    
Discount, gross claim liability 0 0    
Gross claim liability before all subrogation and before reinsurance 3 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 3 3    
Less: Unearned premium reserves (2) (2)    
Plus: Loss adjustment expenses reserves 2 1    
Claim liability reported on Balance Sheet, before reinsurance 2 2    
Reinsurance recoverable reported on Balance Sheet $ 0 $ 0    
IA [Member]        
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Number of policies | Policies 25 25    
Remaining weighted-average contract period (in years) 18 years 18 years    
Gross insured contractual payments outstanding:        
Principal $ 1,158 $ 1,375    
Interest 1,078 1,011    
Total 2,236 2,386    
Gross undiscounted claim liability 49 49    
Discount, gross claim liability 4 2    
Gross claim liability before all subrogation and before reinsurance 46 47    
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 46 47    
Less: Unearned premium reserves (14) (16)    
Plus: Loss adjustment expenses reserves 0 2    
Claim liability reported on Balance Sheet, before reinsurance 32 32    
Reinsurance recoverable reported on Balance Sheet $ 7 $ 6    
II [Member]        
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Number of policies | Policies 17 15    
Remaining weighted-average contract period (in years) 8 years 8 years    
Gross insured contractual payments outstanding:        
Principal $ 599 $ 595    
Interest 479 484    
Total 1,078 1,079    
Gross undiscounted claim liability 41 40    
Discount, gross claim liability 1 1    
Gross claim liability before all subrogation and before reinsurance 40 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 40 39    
Less: Unearned premium reserves (5) (5)    
Plus: Loss adjustment expenses reserves 1 1    
Claim liability reported on Balance Sheet, before reinsurance 36 35    
Reinsurance recoverable reported on Balance Sheet $ 10 $ 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) 16 years 16 years    
Gross insured contractual payments outstanding:        
Principal $ 1,421 $ 1,469    
Interest 199 215    
Total 1,620 1,685    
Gross undiscounted claim liability 581 541    
Discount, gross claim liability 138 85    
Gross claim liability before all subrogation and before reinsurance 443 456    
Less:        
Gross RMBS subrogation 0 0    
Discount, RMBS subrogation 0 0    
Discounted RMBS subrogation, before reinsurance 0 0    
Less:        
Gross other subrogation (36) (36)    
Discount, other subrogation 2 1    
Discounted other subrogation, before reinsurance (34) (35)    
Gross claim liability, net of all subrogation and discounts, before reinsurance 409 421    
Less: Unearned premium reserves (16) (17)    
Plus: Loss adjustment expenses reserves 5 5    
Claim liability reported on Balance Sheet, before reinsurance 398 409    
Reinsurance recoverable reported on Balance Sheet $ 24 $ 24    
IV [Member]        
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Number of policies | Policies 131 132    
Remaining weighted-average contract period (in years) 13 years 14 years    
Gross insured contractual payments outstanding:        
Principal $ 3,124 $ 3,246    
Interest 1,376 1,427    
Total 4,500 4,673    
Gross undiscounted claim liability 1,498 1,690    
Discount, gross claim liability 224 213    
Gross claim liability before all subrogation and before reinsurance 1,274 1,477    
Less:        
Gross RMBS subrogation (1,749) (1,753)    
Discount, RMBS subrogation 2 3    
Discounted RMBS subrogation, before reinsurance (1,748) (1,751)    
Less:        
Gross other subrogation (510) (706)    
Discount, other subrogation 25 18    
Discounted other subrogation, before reinsurance (485) (689)    
Gross claim liability, net of all subrogation and discounts, before reinsurance (959) (963)    
Less: Unearned premium reserves (29) (30)    
Plus: Loss adjustment expenses reserves 49 59    
Claim liability reported on Balance Sheet, before reinsurance (938) (933)    
Reinsurance recoverable reported on Balance Sheet $ (8) $ (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 $ 47 $ 47    
Interest 25 26    
Total 72 72    
Gross undiscounted claim liability 72 72    
Discount, gross claim liability 5 3    
Gross claim liability before all subrogation and before reinsurance 67 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 56 58    
Less: Unearned premium reserves (1) (1)    
Plus: Loss adjustment expenses reserves 0 0    
Claim liability reported on Balance Sheet, before reinsurance 56 57    
Reinsurance recoverable reported on Balance Sheet $ 0 $ 0