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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, 2019
USD ($)
Policies
Dec. 31, 2018
USD ($)
Policies
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]    
Number of policies | Policies 221 231
Remaining weighted-average contract period (in years) 15 years 16 years
Gross insured contractual payments outstanding:    
Principal $ 6,168 $ 9,403
Interest 3,029 10,583
Total 9,197 19,986
Gross undiscounted claim liability 2,434 3,448
Discount, gross claim liability 541 1,092
Gross claim liability before all subrogation and before reinsurance 1,893 2,356
Less:    
Gross RMBS subrogation (1,777) (1,810)
Discount, RMBS subrogation 49 39
Schedule Of Insured Financial Obligations With Credit Deterioration Reductions Of Gross Claim Liability Rmbs Subrogation (1,727) (1,771)
Less:    
Gross other subrogation (720) (785)
Discount, other subrogation 53 133
Discounted other subrogation, before reinsurance (666) (652)
Gross claim liability, net of all subrogation and discounts, before reinsurance (501) (66)
Less: Unearned premium reserves (54) (107)
Plus: Loss adjustment expenses reserves 73 66
Claim liability reported on Balance Sheet, before reinsurance (482) (107)
Reinsurance recoverable reported on Balance Sheet $ 26 $ 23
Surveillance Category One [Member]    
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]    
Number of policies | Policies 34 21
Remaining weighted-average contract period (in years) 8 years 9 years
Gross insured contractual payments outstanding:    
Principal $ 668 $ 917
Interest 340 488
Total 1,007 1,404
Gross undiscounted claim liability 2 4
Discount, gross claim liability 0 0
Gross claim liability before all subrogation and before reinsurance 2 4
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 2 4
Less: Unearned premium reserves (1) (1)
Plus: Loss adjustment expenses reserves 1 1
Claim liability reported on Balance Sheet, before reinsurance 1 4
Reinsurance recoverable reported on Balance Sheet $ 0 $ 0
IA [Member]    
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]    
Number of policies | Policies 18 28
Remaining weighted-average contract period (in years) 21 years 19 years
Gross insured contractual payments outstanding:    
Principal $ 510 $ 708
Interest 507 632
Total 1,016 1,340
Gross undiscounted claim liability 44 64
Discount, gross claim liability 5 13
Gross claim liability before all subrogation and before reinsurance 39 51
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 (11)
Discount, other subrogation 0 7
Discounted other subrogation, before reinsurance 0 (3)
Gross claim liability, net of all subrogation and discounts, before reinsurance 39 47
Less: Unearned premium reserves (9) (10)
Plus: Loss adjustment expenses reserves 1 4
Claim liability reported on Balance Sheet, before reinsurance 30 41
Reinsurance recoverable reported on Balance Sheet $ 6 $ 7
II [Member]    
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]    
Number of policies | Policies 11 18
Remaining weighted-average contract period (in years) 9 years 9 years
Gross insured contractual payments outstanding:    
Principal $ 277 $ 623
Interest 128 293
Total 404 916
Gross undiscounted claim liability 21 36
Discount, gross claim liability 1 3
Gross claim liability before all subrogation and before reinsurance 20 33
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 20 33
Less: Unearned premium reserves (1) (5)
Plus: Loss adjustment expenses reserves 1 3
Claim liability reported on Balance Sheet, before reinsurance 20 30
Reinsurance recoverable reported on Balance Sheet $ 7 $ 4
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) 17 years 22 years
Gross insured contractual payments outstanding:    
Principal $ 857 $ 1,705
Interest 366 6,979
Total 1,223 8,685
Gross undiscounted claim liability 541 992
Discount, gross claim liability 152 434
Gross claim liability before all subrogation and before reinsurance 389 558
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 (41) (137)
Discount, other subrogation 4 67
Discounted other subrogation, before reinsurance (37) (70)
Gross claim liability, net of all subrogation and discounts, before reinsurance 353 489
Less: Unearned premium reserves (7) (36)
Plus: Loss adjustment expenses reserves 4 (6)
Claim liability reported on Balance Sheet, before reinsurance 349 446
Reinsurance recoverable reported on Balance Sheet $ 24 $ 26
IV [Member]    
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]    
Number of policies | Policies 139 145
Remaining weighted-average contract period (in years) 14 years 14 years
Gross insured contractual payments outstanding:    
Principal $ 3,819 $ 5,407
Interest 1,678 2,178
Total 5,498 7,585
Gross undiscounted claim liability 1,778 2,296
Discount, gross claim liability 381 638
Gross claim liability before all subrogation and before reinsurance 1,397 1,658
Less:    
Gross RMBS subrogation (1,777) (1,810)
Discount, RMBS subrogation 49 39
Schedule Of Insured Financial Obligations With Credit Deterioration Reductions Of Gross Claim Liability Rmbs Subrogation (1,727) (1,771)
Less:    
Gross other subrogation (666) (625)
Discount, other subrogation 47 55
Discounted other subrogation, before reinsurance (620) (570)
Gross claim liability, net of all subrogation and discounts, before reinsurance (950) (682)
Less: Unearned premium reserves (35) (54)
Plus: Loss adjustment expenses reserves 67 63
Claim liability reported on Balance Sheet, before reinsurance (918) (672)
Reinsurance recoverable reported on Balance Sheet $ (10) $ (15)
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 $ 37 $ 43
Interest 11 13
Total 48 57
Gross undiscounted claim liability 48 57
Discount, gross claim liability 2 4
Gross claim liability before all subrogation and before reinsurance 46 52
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 (13) (13)
Discount, other subrogation 3 4
Discounted other subrogation, before reinsurance (10) (9)
Gross claim liability, net of all subrogation and discounts, before reinsurance 36 43
Less: Unearned premium reserves 0 0
Plus: Loss adjustment expenses reserves 0 0
Claim liability reported on Balance Sheet, before reinsurance 36 43
Reinsurance recoverable reported on Balance Sheet $ 0 $ 0