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Commitments And Contingencies Environmental Matters (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Environmental Exit Cost [Line Items]    
Accrual for Environmental Loss Contingencies $ 4  
Accrued Environmental Loss Contingencies, Noncurrent 3 $ 4
Accrued Liabilities    
Environmental Exit Cost [Line Items]    
Accrued Environmental Loss Contingencies, Current 1  
Other Long-Term Liabilities    
Environmental Exit Cost [Line Items]    
Accrual for Environmental Loss Contingencies   $ 4
Accrued Environmental Loss Contingencies, Noncurrent $ 3