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Commitments And Contingencies Unsecured Creditors Litigation (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss Contingency Accrual, Provision |  |  |  | $ 0 | $ 10 | $ 300
Unsecured Creditors Litigation |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss Contingency Accrual, Provision |  |  |  |  | $ 10 |
Litigation Settlement, Amount Awarded to Other Party |  | $ 310 |  |  |  |
Payments for Legal Settlements | $ 310 |  |  |  |  |
Judicial Ruling | Unsecured Creditors Litigation |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Per share loss contingency accrual provision |  |  |  |  |  | $ 1.10
Litigation, Damages Benchmark, Fourth LLP Agreement | Unsecured Creditors Litigation |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss Contingency Accrual, Provision |  |  | $ 27 |  |  |
Other income (expense), net | Judicial Ruling | Unsecured Creditors Litigation |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss Contingency Accrual, Provision |  |  |  |  |  | $ 300

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