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Commitments And Contingencies Environmental Remediation Schedule (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]    
Current environmental liabilities $ 2us-gaap_AccruedEnvironmentalLossContingenciesCurrent $ 2us-gaap_AccruedEnvironmentalLossContingenciesCurrent
Noncurrent environmental liabilities 7us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent 8us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent
Total enviromental liabilities $ 9us-gaap_AccrualForEnvironmentalLossContingencies $ 10us-gaap_AccrualForEnvironmentalLossContingencies