v3.24.2.u1
Variable Interest Entities Special Purpose Entities, including Variable Interest Entities - Summary of Assets and Liabilities (Details)
$ in Millions
Jun. 30, 2024
USD ($)
Entity
Dec. 31, 2023
USD ($)
Entity
Jun. 30, 2023
USD ($)
Debt Securities, Available-for-sale, Amortized Cost $ 2,078 $ 2,197  
Fixed maturity securities, at fair value 2,043    
Restricted Cash 11 12 $ 10
Derivative assets 18 26  
Other assets 163 129  
Total assets 8,184 8,428 8,132
Interest Payable 500 475  
Long-term debt 515 508  
Derivative Liability 26 35  
Other Liabilities 203 199  
Liabilities 6,748 6,997  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 45 40  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 78 71  
Variable Interest Entity, Primary Beneficiary [Member]      
Fixed maturity securities, at fair value 2,101 2,167  
Restricted Cash 62 246 $ 266
Financing Receivable, after Allowance for Credit Loss 1,567 1,663  
Derivative assets 208 226  
Other assets 95 92  
Total assets 4,033 4,394  
Long-term debt 2,599 2,710  
Long-term Debt, at par less amortized discount 253 258  
Long-term debt 2,853 2,967  
Derivative Liability 1,136 1,197  
Other Liabilities 7 5  
Liabilities 4,048 4,404  
Estimated Future Premium Payments Maximum Discounted Rate 52 235  
Variable Interest Entity, Primary Beneficiary [Member] | Corporate Debt Securities [Member]      
Fixed maturity securities, at fair value 2,010 2,072  
Variable Interest Entity, Primary Beneficiary [Member] | Municipal Bonds [Member]      
Debt Securities, Available-for-sale, Amortized Cost 85 88  
Fixed maturity securities, at fair value 91 95  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 6 7  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0 0  
Variable Interest Entity, Primary Beneficiary [Member] | Ambac UK [Member]      
Fixed maturity securities, at fair value 2,010 2,072  
Restricted Cash 61 245  
Financing Receivable, after Allowance for Credit Loss 1,567 1,663  
Derivative assets 208 226  
Other assets 93 90  
Total assets 3,939 4,296  
Long-term debt 2,599 2,710  
Long-term Debt, at par less amortized discount 97 99  
Long-term debt 2,696 2,808  
Derivative Liability 1,136 1,197  
Cash collateral payable 52    
Other Liabilities 6 4  
Liabilities 3,890 4,244  
Estimated Future Premium Payments Maximum Discounted Rate   235  
Variable Interest Entity, Primary Beneficiary [Member] | Ambac UK [Member] | Corporate Debt Securities [Member]      
Fixed maturity securities, at fair value 2,010 2,072  
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 91 95  
Restricted Cash 1 1  
Financing Receivable, after Allowance for Credit Loss 0 0  
Derivative assets 0 0  
Other assets 2 2  
Total assets 94 98  
Long-term debt 0 0  
Long-term Debt, at par less amortized discount 156 159  
Long-term debt 156 159  
Derivative Liability 0 0  
Other Liabilities 1 1  
Liabilities 157 160  
Estimated Future Premium Payments Maximum Discounted Rate 0 0  
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 $ 91 $ 95  
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 4 4  
Consolidated Entities [Member] | Ambac Assurance [Member]      
Number Of Consolidated Variable Interest Entities | Entity 2 2