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Variable Interest Entities Special Purpose Entities, including Variable Interest Entities - Summary of Assets and Liabilities (Details)
$ in Millions
Sep. 30, 2021
USD ($)
Entity
Dec. 31, 2020
USD ($)
Entity
Sep. 30, 2020
USD ($)
Debt Securities, Available-for-sale, Amortized Cost $ 2,147    
Fixed maturity securities, at fair value 2,285    
Restricted Cash 6 $ 13 $ 10
Derivative assets 78 93  
Other assets 114 114  
Total assets 12,228 13,220  
Interest Payable 555 517  
Long-term debt 2,215 2,739  
Derivative Liability 94 114  
Other Liabilities 108 106  
Liabilities 11,088 12,074  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 147 149  
Variable Interest Entity, Primary Beneficiary [Member]      
Fixed maturity securities, at fair value 3,317 3,354  
Restricted Cash 2 2 $ 2
Financing Receivable, after Allowance for Credit Loss 2,784 2,998  
Derivative assets 40 41  
Other assets 1 2  
Total assets 6,145 6,398  
Long-term debt 4,097 4,324  
Long-term Debt, at par less amortized discount 159 169  
Long-term debt 4,255 4,493  
Derivative Liability 1,830 1,835  
Liabilities 6,086 6,328  
Variable Interest Entity, Primary Beneficiary [Member] | Corporate Debt Securities [Member]      
Fixed maturity securities, at fair value 3,184 3,215  
Variable Interest Entity, Primary Beneficiary [Member] | Municipal Bonds [Member]      
Debt Securities, Available-for-sale, Amortized Cost 106 113  
Fixed maturity securities, at fair value 133 139  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 27 27  
Variable Interest Entity, Primary Beneficiary [Member] | Ambac UK [Member]      
Fixed maturity securities, at fair value 3,184 3,215  
Restricted Cash 1 1  
Financing Receivable, after Allowance for Credit Loss 2,784 2,998  
Derivative assets 40 41  
Other assets 0 0  
Total assets 6,010 6,255  
Long-term debt 4,097 4,324  
Long-term Debt, at par less amortized discount 0 0  
Long-term debt 4,097 4,324  
Derivative Liability 1,830 1,835  
Liabilities 5,927 6,159  
Variable Interest Entity, Primary Beneficiary [Member] | Ambac UK [Member] | Corporate Debt Securities [Member]      
Fixed maturity securities, at fair value 3,184 3,215  
Variable Interest Entity, Primary Beneficiary [Member] | Ambac UK [Member] | Municipal Bonds [Member]      
Fixed maturity securities, at fair value 0 0  
Variable Interest Entity, Primary Beneficiary [Member] | Ambac Assurance [Member]      
Fixed maturity securities, at fair value 133 139  
Restricted Cash 1 1  
Financing Receivable, after Allowance for Credit Loss 0 0  
Derivative assets 0 0  
Other assets 1 2  
Total assets 135 143  
Long-term debt 0 0  
Long-term Debt, at par less amortized discount 159 169  
Long-term debt 159 169  
Derivative Liability 0 0  
Liabilities 159 169  
Variable Interest Entity, Primary Beneficiary [Member] | Ambac Assurance [Member] | Corporate Debt Securities [Member]      
Fixed maturity securities, at fair value 0 0  
Variable Interest Entity, Primary Beneficiary [Member] | Ambac Assurance [Member] | Municipal Bonds [Member]      
Fixed maturity securities, at fair value $ 133 $ 139  
Consolidated Entities [Member]      
Number Of Consolidated Variable Interest Entities | Entity 6 6  
Consolidated Entities [Member] | Ambac UK [Member]      
Number Of Consolidated Variable Interest Entities | Entity 5 5  
Consolidated Entities [Member] | Ambac Assurance [Member]      
Number Of Consolidated Variable Interest Entities | Entity 1 1