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Basis of Presentation and Significant Accounting Policies Supplemental Cash Flow Information (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Taxes Paid | $ 15 | $ 11 | $ 21 |
Cash and cash equivalents | 17 | 20 | 24 |
Restricted Cash | 5 | 13 | 55 |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 23 | 35 | 81 | $ 83
Reduction in Long-term Debt Through Long-term Debt Exchange | 71 |  |  |
Long-term Debt [Member] |  |  |  |
Interest Paid, Including Capitalized Interest, Operating and Investing Activities | 80 | 107 | 143 |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |
Restricted Cash | $ 2 | $ 2 | $ 2 |

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