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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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- Definition

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