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Business Segment and Geographic Information (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]      
Assets 32,240us-gaap_Assets 29,223us-gaap_Assets  
Number of business segments 2hal_NumberOfBusinessSegments    
Shared assets      
Segment Reporting Information [Line Items]      
Assets 1,930us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_IntersegmentEliminationMember		 1,351us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_IntersegmentEliminationMember		  
Property, Plant and Equipment [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Concentration Risk, Percentage 46.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_PropertyPlantAndEquipmentMember
/ us-gaap_StatementGeographicalAxis
= country_US		 47.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_PropertyPlantAndEquipmentMember
/ us-gaap_StatementGeographicalAxis
= country_US		  
Sales Revenue, Net [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Concentration Risk, Percentage 51.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_StatementGeographicalAxis
= country_US		 49.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_StatementGeographicalAxis
= country_US		 53.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_StatementGeographicalAxis
= country_US