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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
 6 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
Policies
Dec. 31, 2019
USD ($)
Policies
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Loss Reserves Ceded To Reinsurers $ 35 $ 26 $ 27 $ 23
Ceded Loss And Loss Expenses Paid Not Yet Recovered $ 1 $ 0 $ 0  
Number of policies | Policies 247 221    
Remaining weighted-average contract period (in years) 15 years 15 years    
Gross insured contractual payments outstanding:        
Principal $ 7,824 $ 6,168    
Interest 3,753 3,029    
Total 11,577 9,197    
Gross undiscounted claim liability 2,454 2,434    
Discount, gross claim liability 257 541    
Gross claim liability before all subrogation and before reinsurance 2,198 1,893    
Less:        
Gross RMBS subrogation (1,761) (1,777)    
Discount, RMBS subrogation 4 49    
Discounted RMBS subrogation, before reinsurance (1,757) (1,727)    
Less:        
Gross other subrogation (836) (720)    
Discount, other subrogation 20 53    
Discounted other subrogation, before reinsurance (816) (666)    
Gross claim liability, net of all subrogation and discounts, before reinsurance (376) (501)    
Less: Unearned premium reserves (82) (54)    
Plus: Loss adjustment expenses reserves 57 73    
Claim liability reported on Balance Sheet, before reinsurance (401) (482)    
Reinsurance recoverable reported on Balance Sheet $ 36 $ 26    
I/SL [Member]        
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Number of policies | Policies 49 34    
Remaining weighted-average contract period (in years) 10 years 8 years    
Gross insured contractual payments outstanding:        
Principal $ 973 $ 668    
Interest 314 340    
Total 1,287 1,007    
Gross undiscounted claim liability 4 2    
Discount, gross claim liability 0 0    
Gross claim liability before all subrogation and before reinsurance 4 2    
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 2    
Less: Unearned premium reserves (3) (1)    
Plus: Loss adjustment expenses reserves 0 1    
Claim liability reported on Balance Sheet, before reinsurance 1 1    
Reinsurance recoverable reported on Balance Sheet $ 0 $ 0    
IA [Member]        
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Number of policies | Policies 29 18    
Remaining weighted-average contract period (in years) 19 years 21 years    
Gross insured contractual payments outstanding:        
Principal $ 1,159 $ 510    
Interest 1,112 507    
Total 2,271 1,016    
Gross undiscounted claim liability 56 44    
Discount, gross claim liability 2 5    
Gross claim liability before all subrogation and before reinsurance 54 39    
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 54 39    
Less: Unearned premium reserves (22) (9)    
Plus: Loss adjustment expenses reserves 1 1    
Claim liability reported on Balance Sheet, before reinsurance 32 30    
Reinsurance recoverable reported on Balance Sheet $ 6 $ 6    
II [Member]        
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Number of policies | Policies 15 11    
Remaining weighted-average contract period (in years) 9 years 9 years    
Gross insured contractual payments outstanding:        
Principal $ 621 $ 277    
Interest 506 128    
Total 1,126 404    
Gross undiscounted claim liability 42 21    
Discount, gross claim liability 1 1    
Gross claim liability before all subrogation and before reinsurance 41 20    
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 41 20    
Less: Unearned premium reserves (5) (1)    
Plus: Loss adjustment expenses reserves 1 1    
Claim liability reported on Balance Sheet, before reinsurance 37 20    
Reinsurance recoverable reported on Balance Sheet $ 9 $ 7    
III [Member]        
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Number of policies | Policies 16 16    
Remaining weighted-average contract period (in years) 16 years 17 years    
Gross insured contractual payments outstanding:        
Principal $ 1,503 $ 857    
Interest 275 366    
Total 1,778 1,223    
Gross undiscounted claim liability 527 541    
Discount, gross claim liability 70 152    
Gross claim liability before all subrogation and before reinsurance 457 389    
Less:        
Gross RMBS subrogation 0 0    
Discount, RMBS subrogation 0 0    
Discounted RMBS subrogation, before reinsurance 0 0    
Less:        
Gross other subrogation (38) (41)    
Discount, other subrogation 1 4    
Discounted other subrogation, before reinsurance (37) (37)    
Gross claim liability, net of all subrogation and discounts, before reinsurance 420 353    
Less: Unearned premium reserves (18) (7)    
Plus: Loss adjustment expenses reserves 4 4    
Claim liability reported on Balance Sheet, before reinsurance 406 349    
Reinsurance recoverable reported on Balance Sheet $ 27 $ 24    
IV [Member]        
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Number of policies | Policies 135 139    
Remaining weighted-average contract period (in years) 15 years 14 years    
Gross insured contractual payments outstanding:        
Principal $ 3,536 $ 3,819    
Interest 1,538 1,678    
Total 5,074 5,498    
Gross undiscounted claim liability 1,784 1,778    
Discount, gross claim liability 184 381    
Gross claim liability before all subrogation and before reinsurance 1,601 1,397    
Less:        
Gross RMBS subrogation (1,761) (1,777)    
Discount, RMBS subrogation 4 49    
Discounted RMBS subrogation, before reinsurance (1,757) (1,727)    
Less:        
Gross other subrogation (785) (666)    
Discount, other subrogation 18 47    
Discounted other subrogation, before reinsurance (768) (620)    
Gross claim liability, net of all subrogation and discounts, before reinsurance (924) (950)    
Less: Unearned premium reserves (33) (35)    
Plus: Loss adjustment expenses reserves 51 67    
Claim liability reported on Balance Sheet, before reinsurance (907) (918)    
Reinsurance recoverable reported on Balance Sheet $ (6) $ (10)    
V [Member]        
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Number of policies | Policies 3 3    
Remaining weighted-average contract period (in years) 3 years 3 years    
Gross insured contractual payments outstanding:        
Principal $ 32 $ 37    
Interest 10 11    
Total 41 48    
Gross undiscounted claim liability 41 48    
Discount, gross claim liability 0 2    
Gross claim liability before all subrogation and before reinsurance 41 46    
Less:        
Gross RMBS subrogation 0 0    
Discount, RMBS subrogation 0 0    
Discounted RMBS subrogation, before reinsurance 0 0    
Less:        
Gross other subrogation (13) (13)    
Discount, other subrogation 1 3    
Discounted other subrogation, before reinsurance (11) (10)    
Gross claim liability, net of all subrogation and discounts, before reinsurance 30 36    
Less: Unearned premium reserves 0 0    
Plus: Loss adjustment expenses reserves 0 0    
Claim liability reported on Balance Sheet, before reinsurance 30 36    
Reinsurance recoverable reported on Balance Sheet $ 0 $ 0