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Basis of Presentation and Significant Accounting Policies Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income Taxes Paid $ 11 $ 6 $ 15  
Restricted Cash 12 14 5  
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 274 61 23 $ 35
Decrease in long-term debt as a result of surplus notes exchanges 0 0 71  
Securities acquired in transactions related to Puerto Rico restructurings (1) 508 0  
Loans acquired through financial guarantee subrogation 0 20 0  
VIE long-term debt issued related to Puerto Rico restructurings 0 583 0  
Decrease in VIE loans as a result of de-consolidations 133 0 0  
Decrease in VIE long-term debt as a result of de-consolidations 133 0 0  
Increase in VIE long-term debt as a result of consolidations 89 0 0  
Non Cash Exchange of Puerto Rico Bonds 0 185 0  
Long-term Debt [Member]        
Interest Paid, Including Capitalized Interest, Operating and Investing Activities 50 283 80  
Variable Interest Entity, Primary Beneficiary [Member]        
Restricted Cash $ 246 $ 17 $ 2