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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)
12 Months Ended
Dec. 31, 2022
USD ($)
Policies
Dec. 31, 2021
USD ($)
Policies
Jul. 08, 2022
USD ($)
Mar. 15, 2022
USD ($)
Dec. 31, 2020
USD ($)
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]          
Number of policies | Policies 162 205      
Remaining weighted-average contract period (in years) 13 years 14 years      
Gross insured contractual payments outstanding:          
Principal $ 4,047,000,000 $ 6,302,000,000      
Interest 1,750,000,000 2,984,000,000      
Total 5,797,000,000 9,286,000,000      
Gross undiscounted claim liability 1,279,000,000 2,095,000,000      
Discount, gross claim liability 496,000,000 303,000,000      
Gross claim liability before all subrogation and before reinsurance 783,000,000 1,792,000,000      
Less:          
Gross RMBS subrogation (140,000,000) (1,737,000,000)      
Discount, RMBS subrogation 0 7,000,000      
Schedule Of Insured Financial Obligations With Credit Deterioration Reductions Of Gross Claim Liability Rmbs Subrogation (140,000,000) (1,730,000,000)      
Less:          
Gross other subrogation (233,000,000) (633,000,000)      
Discount, other subrogation 54,000,000 28,000,000      
Discounted other subrogation, before reinsurance (179,000,000) (605,000,000)      
Gross claim liability, net of all subrogation and discounts, before reinsurance 464,000,000 (543,000,000)      
Less: Unearned premium reserves (28,000,000) (56,000,000)      
Plus: Loss adjustment expenses reserves 8,000,000 45,000,000      
Claim liability reported on Balance Sheet, before reinsurance   (554,000,000)      
Reinsurance recoverable reported on Balance Sheet 33,000,000 23,000,000      
Ceded Loss And Loss Expenses Paid Not Yet Recovered   0     $ 0
Loss Reserves Ceded To Reinsurers   $ 24,000,000      
Public Finance Puerto Rico Net Par Outstanding 244,000,000        
Cash Shared by PRHTA Creditors Under the PRHTA/CCDA/PSA 389,000,000        
Percent of Creditor Clawback of SUT, Subject to Lifetime Cap     69.00%    
Lifetime Cap of Creditor Clawback of SUT     $ 3,698,000,000    
New PRHTA Bonds to be Issued     1,245,000,000    
AAC Insured GO / PBA Bonds Satisfied or Eliminated       $ 94  
Percent of Par of AACs Outstanding AAC-Insured PRIFA Eliminated       39.00%  
Percent of Par of AACs Outstanding AAC-Insured CCDA Eliminated       19.00%  
Amount of AAC-Insured Par of PRIFA and CCDA Eliminated       $ 172,000,000  
PRHTA 1968 Bonds          
Less:          
New PRHTA Bonds to be Issued     646,400,000    
PRHTA 1998 Bonds          
Less:          
New PRHTA Bonds to be Issued     $ 598,600,000    
Financial Guarantee          
Less:          
Claim liability reported on Balance Sheet, before reinsurance 444,000,000        
Ceded Loss And Loss Expenses Paid Not Yet Recovered 0        
Loss Reserves Ceded To Reinsurers $ 33,000,000        
Loss Reserves [Member]          
Less:          
Weighted average risk-free rate used to discount loss reserves 3.90% 1.20%      
Surveillance Category One [Member]          
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]          
Number of policies | Policies 37 34      
Remaining weighted-average contract period (in years) 7 years 9 years      
Gross insured contractual payments outstanding:          
Principal $ 709,000,000 $ 904,000,000      
Interest 526,000,000 589,000,000      
Total 1,235,000,000 1,493,000,000      
Gross undiscounted claim liability 4,000,000 5,000,000      
Discount, gross claim liability 1,000,000 0      
Gross claim liability before all subrogation and before reinsurance 3,000,000 5,000,000      
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 (14,000,000) 0      
Discount, other subrogation 2,000,000 0      
Discounted other subrogation, before reinsurance (12,000,000) 0      
Gross claim liability, net of all subrogation and discounts, before reinsurance (9,000,000) 5,000,000      
Less: Unearned premium reserves (2,000,000) (3,000,000)      
Plus: Loss adjustment expenses reserves 1,000,000 1,000,000      
Claim liability reported on Balance Sheet, before reinsurance (10,000,000) 3,000,000      
Reinsurance recoverable reported on Balance Sheet $ 1,000,000 $ 1,000,000      
IA [Member]          
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]          
Number of policies | Policies 6 15      
Remaining weighted-average contract period (in years) 19 years 12 years      
Gross insured contractual payments outstanding:          
Principal $ 200,000,000 $ 840,000,000      
Interest 198,000,000 612,000,000      
Total 399,000,000 1,452,000,000      
Gross undiscounted claim liability 4,000,000 16,000,000      
Discount, gross claim liability 1,000,000 1,000,000      
Gross claim liability before all subrogation and before reinsurance 3,000,000 15,000,000      
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 (4,000,000) (5,000,000)      
Discount, other subrogation 0 0      
Discounted other subrogation, before reinsurance (3,000,000) (5,000,000)      
Gross claim liability, net of all subrogation and discounts, before reinsurance 0 10,000,000      
Less: Unearned premium reserves (2,000,000) (10,000,000)      
Plus: Loss adjustment expenses reserves 1,000,000 0      
Claim liability reported on Balance Sheet, before reinsurance (2,000,000) 1,000,000      
Reinsurance recoverable reported on Balance Sheet $ 0 $ 1,000,000      
II [Member]          
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]          
Number of policies | Policies 9 7      
Remaining weighted-average contract period (in years) 14 years 14 years      
Gross insured contractual payments outstanding:          
Principal $ 459,000,000 $ 459,000,000      
Interest 286,000,000 308,000,000      
Total 745,000,000 767,000,000      
Gross undiscounted claim liability 43,000,000 45,000,000      
Discount, gross claim liability 7,000,000 3,000,000      
Gross claim liability before all subrogation and before reinsurance 36,000,000 42,000,000      
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 36,000,000 42,000,000      
Less: Unearned premium reserves (5,000,000) (5,000,000)      
Plus: Loss adjustment expenses reserves 0 0      
Claim liability reported on Balance Sheet, before reinsurance 32,000,000 38,000,000      
Reinsurance recoverable reported on Balance Sheet $ 8,000,000 $ 10,000,000      
III [Member]          
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]          
Number of policies | Policies 12 14      
Remaining weighted-average contract period (in years) 14 years 15 years      
Gross insured contractual payments outstanding:          
Principal $ 1,000,000,000 $ 1,300,000,000      
Interest 156,000,000 169,000,000      
Total 1,156,000,000 1,469,000,000      
Gross undiscounted claim liability 446,000,000 544,000,000      
Discount, gross claim liability 162,000,000 109,000,000      
Gross claim liability before all subrogation and before reinsurance 284,000,000 435,000,000      
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 (31,000,000) (33,000,000)      
Discount, other subrogation 5,000,000 2,000,000      
Discounted other subrogation, before reinsurance (26,000,000) (31,000,000)      
Gross claim liability, net of all subrogation and discounts, before reinsurance 258,000,000 404,000,000      
Less: Unearned premium reserves (8,000,000) (14,000,000)      
Plus: Loss adjustment expenses reserves 2,000,000 4,000,000      
Claim liability reported on Balance Sheet, before reinsurance 252,000,000 394,000,000      
Reinsurance recoverable reported on Balance Sheet $ 21,000,000 $ 22,000,000      
IV [Member]          
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]          
Number of policies | Policies 93 130      
Remaining weighted-average contract period (in years) 12 years 13 years      
Gross insured contractual payments outstanding:          
Principal $ 1,646,000,000 $ 2,759,000,000      
Interest 565,000,000 1,284,000,000      
Total 2,210,000,000 4,043,000,000      
Gross undiscounted claim liability 729,000,000 1,423,000,000      
Discount, gross claim liability 316,000,000 185,000,000      
Gross claim liability before all subrogation and before reinsurance 413,000,000 1,238,000,000      
Less:          
Gross RMBS subrogation (140,000,000) (1,737,000,000)      
Discount, RMBS subrogation 0 7,000,000      
Schedule Of Insured Financial Obligations With Credit Deterioration Reductions Of Gross Claim Liability Rmbs Subrogation (140,000,000) (1,730,000,000)      
Less:          
Gross other subrogation (172,000,000) (583,000,000)      
Discount, other subrogation 42,000,000 24,000,000      
Discounted other subrogation, before reinsurance (130,000,000) (559,000,000)      
Gross claim liability, net of all subrogation and discounts, before reinsurance 143,000,000 (1,051,000,000)      
Less: Unearned premium reserves (10,000,000) (24,000,000)      
Plus: Loss adjustment expenses reserves 4,000,000 40,000,000      
Claim liability reported on Balance Sheet, before reinsurance 137,000,000 (1,036,000,000)      
Reinsurance recoverable reported on Balance Sheet $ 3,000,000 $ (11,000,000)      
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 $ 34,000,000 $ 40,000,000      
Interest 19,000,000 22,000,000      
Total 53,000,000 62,000,000      
Gross undiscounted claim liability 53,000,000 62,000,000      
Discount, gross claim liability 9,000,000 4,000,000      
Gross claim liability before all subrogation and before reinsurance 43,000,000 57,000,000      
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 (12,000,000) (12,000,000)      
Discount, other subrogation 4,000,000 2,000,000      
Discounted other subrogation, before reinsurance (8,000,000) (10,000,000)      
Gross claim liability, net of all subrogation and discounts, before reinsurance 35,000,000 47,000,000      
Less: Unearned premium reserves (1,000,000) (1,000,000)      
Plus: Loss adjustment expenses reserves 0 0      
Claim liability reported on Balance Sheet, before reinsurance 34,000,000 46,000,000      
Reinsurance recoverable reported on Balance Sheet $ 0 $ 0