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Commitments And Contingencies Environmental Matters (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Environmental Exit Cost [Line Items]    
Accrual for Environmental Loss Contingencies $ 6 $ 4
Accrued Environmental Loss Contingencies, Noncurrent 5 3
Accrued Liabilities    
Environmental Exit Cost [Line Items]    
Accrued Environmental Loss Contingencies, Current 1 1
Other Long-Term Liabilities    
Environmental Exit Cost [Line Items]    
Accrued Environmental Loss Contingencies, Noncurrent $ 5 3
Liabilities Held for Sale | Discontinued Operations    
Environmental Exit Cost [Line Items]    
Accrual for Environmental Loss Contingencies   $ 6