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Financial Instruments and Risk Management (Credit Risk) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Concentration Risk [Line Items]    
Number of debt instruments with related interest rate swaps 3hal_NumberOfDebtInstrumentsWithRelatedInterestRateSwaps  
Longterm Debt Percentage Bearing Fixed Interest Amount After Swaps 6,300,000,000hal_LongtermDebtPercentageBearingFixedInterestAmountAfterSwaps  
Maximum term of currency derivative instruments (in years) 1 year  
Long-term Debt, Percentage Bearing Fixed Interest, Amount 7,800,000,000us-gaap_LongtermDebtPercentageBearingFixedInterestAmount 7,816,000,000us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
Geographic Concentration Risk | Accounts Receivable | United States    
Concentration Risk [Line Items]    
Concentration Risk, Percentage (in hundredths)   34.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ hal_GeographicLocationAxis
= country_US
United States | Accounts Receivable    
Concentration Risk [Line Items]    
Concentration Risk, Percentage (in hundredths) 39.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_StatementGeographicalAxis
= country_US		  
VENEZUELA | Accounts Receivable    
Concentration Risk [Line Items]    
Concentration Risk, Percentage (in hundredths) 9.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_StatementGeographicalAxis
= country_VE		 8.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_StatementGeographicalAxis
= country_VE