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Commitments and Contingencies (Environmental) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Accrual for Environmental Loss Contingencies Disclosure [Abstract]    
Accrual for Environmental Loss Contingencies $ 58us-gaap_AccrualForEnvironmentalLossContingencies $ 57us-gaap_AccrualForEnvironmentalLossContingencies
Superfund Sites [Member]    
Accrual for Environmental Loss Contingencies Disclosure [Abstract]    
Accrual for site contingency $ 1us-gaap_AccrualForEnvironmentalLossContingenciesGross
/ us-gaap_EnvironmentalRemediationSiteAxis
= hal_SuperfundSitesMember		  
Number of superfund sites 8hal_NumberOfSuperfundSites
/ us-gaap_EnvironmentalRemediationSiteAxis
= hal_SuperfundSitesMember