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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