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Basis of Presentation and Significant Accounting Policies Supplemental Cash Flow information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Reduction in Long-term Debt Through Long-term Debt Exchange | $ 0 | $ 0 |  | $ 71 |
Exchange of investments in Puerto Rico bonds for new securities issued in the restructuring transactions | 185 |  |  |  |
Income Taxes Paid |  | 5 | $ 10 |  |
Cash and cash equivalents | 32 | 32 | 13 | 17 |
Restricted Cash | 5 | 5 | 17 | 5 |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 39 | 39 | 32 | 23 | $ 35
Long-term Debt [Member] |  |  |  |  |
Interest Paid, Including Capitalized Interest, Operating and Investing Activities |  | 32 | 49 |  |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |
Restricted Cash | $ 2 | $ 2 | $ 2 | $ 2 |

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