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Basis of Presentation and Significant Accounting Policies Supplemental Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2020
Schedule of Cash Flow Supplemental Information [Line Items] |
Schedule of Supplemental Cash Flow Information [Table Text Block] | Supplemental Disclosure of Cash Flow Information
Year Ended December 31, |  | 2020 |  | 2019 |  | 2018
Cash paid during the period for: |  |  |  |  |  |
Income taxes |  | $ | 11 |  |  | $ | 21 |  |  | $ | 35 |
Interest on long-term debt |  | 107 |  |  | 143 |  |  | 232 |
Non-cash investing and financing activities: |  |  |  |  |  |
Increase in long-term debt in exchange for AMPS |  | — |  |  | — |  |  | 187 |
Exchange of investments in Puerto Rico COFINA bonds for new bonds issued in the Plan of Adjustment |  | — |  |  | 510 |  |  | — |
Decrease in long-term debt as a result of an exchange for investment securities |  | — |  |  | — |  |  | — |
Rehabilitation exit transaction discharge of all Deferred Amounts and cancellation of certain senior surplus notes |  | — |  |  | — |  |  | 1,919 |
December 31, |  | 2020 |  | 2019 |  | 2018
Reconciliation of cash, cash equivalents, and restricted cash reported within the Consolidated Balance Sheets to the Consolidated Statements of Cash Flow: |  |  |  |  |  |
Cash and cash equivalents |  | $ | 20 |  |  | $ | 24 |  |  | $ | 63 |
Restricted cash |  | 13 |  |  | 55 |  |  | 19 |
Variable Interest Entity Restricted cash |  | 2 |  |  | 2 |  |  | 1 |
Total cash, cash equivalents, and restricted cash shown on the Consolidated Statements of Cash Flows |  | 35 |  |  | 81 |  |  | 83 |
Cash Flow, Supplemental Disclosures [Text Block] | Supplemental information related to leases is as follows:
Year Ended December 31, |  | 2020 |  | 2019
Cash paid for amounts included in the measurement of operating lease liabilities |  | $ | 4 |  |  | $ | 6 |
Right-of-use assets obtained in exchange for operating lease liabilities (non-cash) (1) |  | — |  |  | 30 |
(1) Includes right-of-use assets of $14 for the year ended December 31, 2019 for leases which existed prior to the New Lease Standard implementation date of January 1, 2019.

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- Definition [Line Items] for Schedule of Cash Flow Supplemental Information [Table] + References No definition available. + Details
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- Definition The entire disclosure for supplemental cash flow activities, including cash, noncash, and part noncash transactions, for the period. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -URI http://asc.fasb.org/topic&trid=2134446 + Details
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- Definition Tabular disclosure of supplemental cash flow information for the periods presented. + References No definition available. + Details
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