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Debt (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Apr. 23, 2013
Debt Instrument [Line Items]      
Long-term Debt, Percentage Bearing Fixed Interest, Amount $ 7,800,000,000us-gaap_LongtermDebtPercentageBearingFixedInterestAmount $ 7,816,000,000us-gaap_LongtermDebtPercentageBearingFixedInterestAmount  
Long-term debt 7,840,000,000us-gaap_LongTermDebtNoncurrent 7,816,000,000us-gaap_LongTermDebtNoncurrent  
Long-term Debt and Capital Lease Obligations, Including Current Maturities 7,854,000,000us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities 7,816,000,000us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities  
Debt instrument call feature description We may redeem all of our senior notes from time to time or all of the notes of each series at any time at the applicable redemption prices, plus accrued and unpaid interest.    
Line of Credit Facility, Expiration Date Apr. 23, 2018    
Long-term Debt, Current Maturities 14,000,000us-gaap_LongTermDebtCurrent 0us-gaap_LongTermDebtCurrent  
Long-term Debt, Maturities, Repayments of Principal in Year Two 610,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo    
Long-term Debt, Maturities, Repayments of Principal in Year Three 52,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree    
Long-term Debt, Maturities, Repayments of Principal in Year Four 806,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour    
Long-term Debt, Maturities Repayments of Principal in Year Five 1,000,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive    
Line of Credit Facility, Remaining Borrowing Capacity 3,000,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity    
Revolving Credit Facility      
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity     3,000,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Senior notes due August 2023      
Debt Instrument [Line Items]      
Long-term debt 1,098,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueAugust2023Member		 1,098,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueAugust2023Member		  
Maturity date August 2023    
Interest rate (in hundredths) 3.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueAugust2023Member		    
Senior notes due September 2019      
Debt Instrument [Line Items]      
Long-term debt 998,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueSeptember2019Member		 997,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueSeptember2019Member		  
Maturity date September 2019 September 2019  
Interest rate (in hundredths) 6.15%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueSeptember2019Member		 6.15%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueSeptember2019Member		  
Senior notes due September 2039      
Debt Instrument [Line Items]      
Long-term debt 995,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueSeptember2039Member		 995,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueSeptember2039Member		  
Maturity date September 2039 September 2039  
Interest rate (in hundredths) 7.45%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueSeptember2039Member		 7.45%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueSeptember2039Member		  
Senior notes due August 2043      
Debt Instrument [Line Items]      
Long-term debt 898,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueAugust2043Member		 898,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueAugust2043Member		  
Maturity date August 2043    
Interest rate (in hundredths) 4.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueAugust2043Member		    
Senior notes due September 2038      
Debt Instrument [Line Items]      
Long-term debt 800,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= hal_SeniorNotesDue2038Member		 800,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= hal_SeniorNotesDue2038Member		  
Maturity date September 2038 September 2038  
Interest rate (in hundredths) 6.70%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hal_SeniorNotesDue2038Member		 6.70%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hal_SeniorNotesDue2038Member		  
Senior notes due August 2016      
Debt Instrument [Line Items]      
Long-term debt 600,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueAugust2016Member		 600,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueAugust2016Member		  
Maturity date August 2016    
Interest rate (in hundredths) 1.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueAugust2016Member		    
Senior notes due November 2021      
Debt Instrument [Line Items]      
Long-term debt 499,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueNovember2021Member		 498,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueNovember2021Member		  
Maturity date November 2021 November 2021  
Interest rate (in hundredths) 3.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueNovember2021Member		 3.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueNovember2021Member		  
Senior notes due November 2041      
Debt Instrument [Line Items]      
Long-term debt 498,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueNovember2041Member		 498,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueNovember2041Member		  
Maturity date November 2041 November 2041  
Interest rate (in hundredths) 4.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueNovember2041Member		 4.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueNovember2041Member		  
Senior notes due August 2018      
Debt Instrument [Line Items]      
Long-term debt 400,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueAugust2018Member		 400,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueAugust2018Member		  
Maturity date August 2018    
Interest rate (in hundredths) 2.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueAugust2018Member		    
Senior notes due September 2018      
Debt Instrument [Line Items]      
Long-term debt 400,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueSeptember2018Member		 400,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueSeptember2018Member		  
Maturity date September 2018 September 2018  
Interest rate (in hundredths) 5.90%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueSeptember2018Member		 5.90%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueSeptember2018Member		  
Senior debentures due August 2096      
Debt Instrument [Line Items]      
Long-term debt 293,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueAugust2096Member		 293,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueAugust2096Member		  
Maturity date August 2096 August 2096  
Interest rate (in hundredths) 7.60%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueAugust2096Member		 7.60%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueAugust2096Member		  
Debt instruments non-call feature description may not be redeemed prior to maturity    
Senior debentures due February 2021      
Debt Instrument [Line Items]      
Long-term debt 184,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueFebruary2021Member		 184,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueFebruary2021Member		  
Maturity date February 2021 February 2021  
Interest rate (in hundredths) 8.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueFebruary2021Member		 8.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueFebruary2021Member		  
Senior notes due February 2027 [Member] [Domain]      
Debt Instrument [Line Items]      
Long-term debt 104,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueFebruary2027MemberDomain		 104,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueFebruary2027MemberDomain		  
Maturity date February 2027    
Interest rate (in hundredths) 6.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueFebruary2027MemberDomain		    
Senior notes due May 2017 [Member] [Domain] [Member]      
Debt Instrument [Line Items]      
Long-term debt 45,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueMay2017Member		 45,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueMay2017Member		  
Maturity date May 2017    
Interest rate (in hundredths) 7.53%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hal_SeniornotesdueMay2017Member		    
Other Debt Obligations [Member]      
Debt Instrument [Line Items]      
Long-term debt $ 42,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= us-gaap_OtherDebtSecuritiesMember		 $ 6,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= us-gaap_OtherDebtSecuritiesMember