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Commitments And Contingencies Unsecured Creditors Litigation (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Mar. 31, 2017 | Jun. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2016
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Reserve for Unsecured Creditors Litigation |  | $ 0 | $ 0 |  |  | $ 0 | $ 10,000,000 |
Unsecured Creditors Litigation |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Loss Contingency, Damages Sought, Value Per Unit in Excess of Benchmark |  |  |  |  |  | 32.50 |  |
Loss Contingency, Damages Sought, Unit in Excess of Benchmark |  |  |  |  |  | 67.50 |  |
Litigation, Damages Benchmark, Fourth LLP Agreement | Unsecured Creditors Litigation |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Cumulative Distribution Threshold |  |  |  |  |  | 7,200,000,000 |  |
Reserve for Unsecured Creditors Litigation |  |  |  | $ 27,000,000 |  |  | $ 10,000,000 |
Unsecured Creditors litigation, amount of agreed settlement |  |  |  |  | $ (310,000,000) |  |  |
Payments for Legal Settlements | $ 310,000,000 |  |  |  |  |  |  |
Maximum [Member] | Unsecured Creditors Litigation |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Loss Contingency, Estimate of Possible Loss |  | $ 300,000,000 |  |  |  | $ 300,000,000 |  |
Other income (expense), net | Judicial Ruling [Member] | Unsecured Creditors Litigation |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Reserve for Unsecured Creditors Litigation |  |  |  |  |  |  |  | $ 300,000,000

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