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Commitments and Contingencies (Environmental) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Accrual for Environmental Loss Contingencies Disclosure [Abstract]    
Accrued liabilities for environmental matters $ 57us-gaap_AccrualForEnvironmentalLossContingencies $ 66us-gaap_AccrualForEnvironmentalLossContingencies
Superfund Sites [Member]    
Accrual for Environmental Loss Contingencies Disclosure [Abstract]    
Number of superfund sites 10hal_NumberOfSuperfundSites
/ us-gaap_EnvironmentalRemediationSiteAxis
= hal_SuperfundSitesMember		  
Accrual for site contingency $ 3us-gaap_AccrualForEnvironmentalLossContingenciesGross
/ us-gaap_EnvironmentalRemediationSiteAxis
= hal_SuperfundSitesMember