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Schedule II - Condensed Financial Information of Registrant (Parent Company Only) - Condensed Balance Sheet (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Condensed Balance Sheet Statements, Captions [Line Items]        
Common stock, shares issued 46,477,068 45,865,081    
Treasury stock, shares 172,929 55,942    
Common Stock, Shares, Outstanding 46,304,139      
Assets:        
Debt Securities, Available-for-sale $ 2,265      
Short-term investments, at cost (approximates fair value) 2,140      
Other Investments 690 $ 595    
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0    
Investments, Total 2,955 3,544    
Other assets 68 68    
Total assets 12,303 13,220    
Liabilities:        
Total liabilities 11,187 12,074    
Stockholders' equity (deficit):        
Preferred Stock, Value, Issued 0 0    
Common stock 0 0    
Additional paid-in capital 257 242    
Accumulated other comprehensive income 58 79 $ 42  
Retained earnings 726 759    
Common stock held in treasury at cost (3) (1)    
Total Ambac Financial Group, Inc. stockholders’ equity 1,038 1,080    
Total liabilities, redeemable noncontrolling interest and stockholders’ equity 12,303 13,220    
Ambac Financial Group, Inc Parent Company Only [Member]        
Assets:        
Short-term investments, at cost (approximates fair value) 130 76    
Other Investments 11 54    
Debt Securities, Available-for-sale, Allowance for Credit Loss 3 2    
Investments, Total 254 349    
Cash 1 7    
Investment in subsidiaries 769 714    
Investment income due and accrued 1 0    
Other assets 17 13    
Total assets 1,041 1,082    
Taxes Payable, Current 1 0    
Liabilities:        
Accounts payable and other liabilities 2 2    
Total liabilities 3 3    
Stockholders' equity (deficit):        
Preferred Stock, Value, Issued 0 0    
Common stock 0 0    
Additional paid-in capital 257 242    
Accumulated other comprehensive income 58 79    
Retained earnings 726 759    
Common stock held in treasury at cost (3) (1)    
Total Ambac Financial Group, Inc. stockholders’ equity 1,038 1,080 $ 1,477 $ 1,592
Total liabilities, redeemable noncontrolling interest and stockholders’ equity 1,041 1,082    
Short-term Investments [Member]        
Assets:        
Debt Securities, Available-for-sale 414 492    
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0    
Short-term Investments [Member] | Ambac Financial Group, Inc Parent Company Only [Member]        
Assets:        
Short-term investments, at cost (approximates fair value) 124 229    
Fixed Income Securities [Member]        
Assets:        
Debt Securities, Available-for-sale 1,730 2,317    
Short-term investments, at cost (approximates fair value) 1,605 2,175    
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0    
Investment income due and accrued 10 10    
Fixed Income Securities [Member] | Ambac Financial Group, Inc Parent Company Only [Member]        
Assets:        
Debt Securities, Available-for-sale $ 119 $ 66