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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