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Basis of Presentation and Significant Accounting Policies Supplemental Cash Flow Information (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Taxes Paid | $ 6 | $ 15 | $ 11 |
Restricted Cash | 14 | 5 | 13 |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 61 | 23 | 35 | $ 81
Decrease in long-term debt as a result of surplus notes exchanges |  | 71 |  |
Securities acquired in transactions related to Puerto Rico restructurings | 508 |  |  |
Loans acquired through financial guarantee subrogation | 20 |  |  |
VIE long-term debt issued related to Puerto Rico restructurings | 583 |  |  |
Long-term Debt [Member] |  |  |  |
Interest Paid, Including Capitalized Interest, Operating and Investing Activities | 283 | 80 | 107 |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |
Restricted Cash | $ 17 | $ 2 | $ 2 |

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