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Commitments And Contingencies Unsecured Creditors Litigation (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended		12 Months Ended
	Jul. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Loss Contingencies [Line Items]
Loss Contingency Accrual, Provision				$ 0	$ 10	$ 300
Unsecured Creditors Litigation
Loss Contingencies [Line Items]
Loss Contingency Accrual, Provision					$ 10
Litigation Settlement, Amount Awarded to Other Party		$ 310
Payments for Legal Settlements	$ 310
Judicial Ruling | Unsecured Creditors Litigation
Loss Contingencies [Line Items]
Per share loss contingency accrual provision						$ 1.10
Litigation, Damages Benchmark, Fourth LLP Agreement | Unsecured Creditors Litigation
Loss Contingencies [Line Items]
Loss Contingency Accrual, Provision			$ 27
Other income (expense), net | Judicial Ruling | Unsecured Creditors Litigation
Loss Contingencies [Line Items]
Loss Contingency Accrual, Provision						$ 300

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Per share amount charged against net income, increasing loss contingency liability.

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Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
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