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Basis of Presentation and Significant Accounting Policies Supplemental Cash Flow information (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Reduction in Long-term Debt Through Long-term Debt Exchange | $ 71 |  |  |
Income Taxes Paid | 8 | $ 2 |  |
Cash and cash equivalents | 23 | 58 | $ 20 |
Restricted Cash | 16 | 31 | 13 |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 42 | 91 | 35 | $ 81
Long-term Debt [Member] |  |  |  |
Interest Paid, Including Capitalized Interest, Operating and Investing Activities | 25 | 31 |  |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |
Restricted Cash | $ 2 | $ 2 | $ 2 |

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