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Basis of Presentation and Significant Accounting Policies Supplemental Cash Flow Information (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Aug. 03, 2018
Income Taxes Paid | $ 11 | $ 21 | $ 35 |
AMPS Exchange Carrying Value of Surplus Notes Issued |  |  |  | $ 187
Non Cash Exchange of Puerto Rico Bonds |  | 510 |  |
Non Cash Impact of Rehabilitation Exit Transaction |  |  | 1,919 |
Cash and cash equivalents | 20 | 24 | 63 |
Restricted Cash | 13 | 55 | 19 |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 35 | 81 | 83 |
Long-term Debt [Member] |  |  |  |
Interest Paid, Including Capitalized Interest, Operating and Investing Activities | $ 107 | $ 143 | $ 232 |

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