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Financial Guarantee Insurance Contracts - Summary of Information Related to Policies Currently Included in Ambac's Loss Reserves or Subrogation Recoverable (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
Policies
Dec. 31, 2020
USD ($)
Policies
Dec. 31, 2019
USD ($)
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]      
Number of policies | Policies 205 232  
Remaining weighted-average contract period (in years) 14 years 14 years  
Gross insured contractual payments outstanding:      
Principal $ 6,302 $ 7,573  
Interest 2,984 3,443  
Total 9,286 11,016  
Gross undiscounted claim liability 2,095 2,395  
Discount, gross claim liability 303 303  
Gross claim liability before all subrogation and before reinsurance 1,792 2,092  
Less:      
Gross RMBS subrogation (1,737) (1,753)  
Discount, RMBS subrogation 7 3  
Schedule Of Insured Financial Obligations With Credit Deterioration Reductions Of Gross Claim Liability Rmbs Subrogation (1,730) (1,751)  
Less:      
Gross other subrogation (633) (755)  
Discount, other subrogation 28 20  
Discounted other subrogation, before reinsurance (605) (735)  
Gross claim liability, net of all subrogation and discounts, before reinsurance (543) (394)  
Less: Unearned premium reserves (56) (72)  
Plus: Loss adjustment expenses reserves 45 68  
Claim liability reported on Balance Sheet, before reinsurance (522) (397)  
Reinsurance recoverable reported on Balance Sheet 23 33  
Ceded Loss And Loss Expenses Paid Not Yet Recovered   1 $ 0
Loss Reserves Ceded To Reinsurers   $ 33  
Financial Guarantee      
Less:      
Claim liability reported on Balance Sheet, before reinsurance (554)    
Ceded Loss And Loss Expenses Paid Not Yet Recovered 0    
Loss Reserves Ceded To Reinsurers $ 24    
Loss Reserves [Member]      
Less:      
Weighted average risk-free rate used to discount loss reserves 1.20% 1.10%  
Surveillance Category One [Member]      
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]      
Number of policies | Policies 34 40  
Remaining weighted-average contract period (in years) 9 years 10 years  
Gross insured contractual payments outstanding:      
Principal $ 904 $ 842  
Interest 589 279  
Total 1,493 1,121  
Gross undiscounted claim liability 5 3  
Discount, gross claim liability 0 0  
Gross claim liability before all subrogation and before reinsurance 5 3  
Less:      
Gross RMBS subrogation 0 0  
Discount, RMBS subrogation 0 0  
Schedule Of Insured Financial Obligations With Credit Deterioration Reductions Of Gross Claim Liability Rmbs Subrogation 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 5 3  
Less: Unearned premium reserves (3) (2)  
Plus: Loss adjustment expenses reserves 1 1  
Claim liability reported on Balance Sheet, before reinsurance 3 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 $ 840 $ 1,375  
Interest 612 1,011  
Total 1,452 2,386  
Gross undiscounted claim liability 16 49  
Discount, gross claim liability 1 2  
Gross claim liability before all subrogation and before reinsurance 15 47  
Less:      
Gross RMBS subrogation 0 0  
Discount, RMBS subrogation 0 0  
Schedule Of Insured Financial Obligations With Credit Deterioration Reductions Of Gross Claim Liability Rmbs Subrogation 0 0  
Less:      
Gross other subrogation (5) 0  
Discount, other subrogation 0 0  
Discounted other subrogation, before reinsurance (5) 0  
Gross claim liability, net of all subrogation and discounts, before reinsurance 10 47  
Less: Unearned premium reserves (10) (16)  
Plus: Loss adjustment expenses reserves 0 2  
Claim liability reported on Balance Sheet, before reinsurance 1 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 7 15  
Remaining weighted-average contract period (in years) 14 years 8 years  
Gross insured contractual payments outstanding:      
Principal $ 459 $ 595  
Interest 308 484  
Total 767 1,079  
Gross undiscounted claim liability 45 40  
Discount, gross claim liability 3 1  
Gross claim liability before all subrogation and before reinsurance 42 40  
Less:      
Gross RMBS subrogation 0 0  
Discount, RMBS subrogation 0 0  
Schedule Of Insured Financial Obligations With Credit Deterioration Reductions Of Gross Claim Liability Rmbs Subrogation 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 42 39  
Less: Unearned premium reserves (5) (5)  
Plus: Loss adjustment expenses reserves 0 1  
Claim liability reported on Balance Sheet, before reinsurance 38 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 14 15  
Remaining weighted-average contract period (in years) 15 years 16 years  
Gross insured contractual payments outstanding:      
Principal $ 1,300 $ 1,469  
Interest 169 215  
Total 1,469 1,685  
Gross undiscounted claim liability 544 541  
Discount, gross claim liability 109 85  
Gross claim liability before all subrogation and before reinsurance 435 456  
Less:      
Gross RMBS subrogation 0 0  
Discount, RMBS subrogation 0 0  
Schedule Of Insured Financial Obligations With Credit Deterioration Reductions Of Gross Claim Liability Rmbs Subrogation 0 0  
Less:      
Gross other subrogation (33) (36)  
Discount, other subrogation 2 1  
Discounted other subrogation, before reinsurance (31) (35)  
Gross claim liability, net of all subrogation and discounts, before reinsurance 404 421  
Less: Unearned premium reserves (14) (17)  
Plus: Loss adjustment expenses reserves 4 5  
Claim liability reported on Balance Sheet, before reinsurance 394 409  
Reinsurance recoverable reported on Balance Sheet $ 22 $ 24  
IV [Member]      
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]      
Number of policies | Policies 130 132  
Remaining weighted-average contract period (in years) 13 years 14 years  
Gross insured contractual payments outstanding:      
Principal $ 2,759 $ 3,246  
Interest 1,284 1,427  
Total 4,043 4,673  
Gross undiscounted claim liability 1,423 1,690  
Discount, gross claim liability 185 213  
Gross claim liability before all subrogation and before reinsurance 1,238 1,477  
Less:      
Gross RMBS subrogation (1,737) (1,753)  
Discount, RMBS subrogation 7 3  
Schedule Of Insured Financial Obligations With Credit Deterioration Reductions Of Gross Claim Liability Rmbs Subrogation (1,730) (1,751)  
Less:      
Gross other subrogation (583) (706)  
Discount, other subrogation 24 18  
Discounted other subrogation, before reinsurance (559) (689)  
Gross claim liability, net of all subrogation and discounts, before reinsurance (1,051) (963)  
Less: Unearned premium reserves (24) (30)  
Plus: Loss adjustment expenses reserves 40 59  
Claim liability reported on Balance Sheet, before reinsurance (1,036) (933)  
Reinsurance recoverable reported on Balance Sheet $ (11) $ (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 22 26  
Total 62 72  
Gross undiscounted claim liability 62 72  
Discount, gross claim liability 4 3  
Gross claim liability before all subrogation and before reinsurance 57 69  
Less:      
Gross RMBS subrogation 0 0  
Discount, RMBS subrogation 0 0  
Schedule Of Insured Financial Obligations With Credit Deterioration Reductions Of Gross Claim Liability Rmbs Subrogation 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 47 58  
Less: Unearned premium reserves (1) (1)  
Plus: Loss adjustment expenses reserves 0 0  
Claim liability reported on Balance Sheet, before reinsurance 46 57  
Reinsurance recoverable reported on Balance Sheet $ 0 $ 0