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Shareholders' Equity And Net Income Per Share Other (Details) - USD ($) |  |  | 1 Months Ended | 9 Months Ended | 11 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 04, 2017 | Nov. 22, 2017 | Jul. 31, 2017 | Sep. 30, 2018 | Nov. 22, 2011
Shareholders' Equity and Net Income Per Share [Line Items] |  |  |  |  |
Initial Offering Period |  |  |  |  | November 22, 2011
Distribution Date | Dec. 04, 2017 |  |  |  |
Record Date |  | Nov. 22, 2017 |  |  |
Unsecured Creditors Litigation |  |  |  |  |
Shareholders' Equity and Net Income Per Share [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 |
Unsecured Creditors Litigation | Litigation, Damages Benchmark, Fourth LLP Agreement |  |  |  |  |
Shareholders' Equity and Net Income Per Share [Line Items] |  |  |  |  |
Cumulative Distribution Threshold |  |  |  | 7,200,000,000 |
Payments for Legal Settlements |  |  | $ 310,000,000 |  |
Maximum [Member] | Unsecured Creditors Litigation |  |  |  |  |
Shareholders' Equity and Net Income Per Share [Line Items] |  |  |  |  |
Loss Contingency, Estimate of Possible Loss |  |  |  | $ 300,000,000 |

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