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Commitments and Contingencies - Accrued Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Loss Contingencies    
Current $ 1us-gaap_AccruedEnvironmentalLossContingenciesCurrent $ 1us-gaap_AccruedEnvironmentalLossContingenciesCurrent
Non-current 2us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent 3us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent
Total environmental liabilities $ 3us-gaap_AccrualForEnvironmentalLossContingencies $ 4us-gaap_AccrualForEnvironmentalLossContingencies