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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