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Income Taxes (Schedule of Income Tax Benefit (Provision)) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Abstract]        
Unrecognized Tax Benefits $ 235us-gaap_UnrecognizedTaxBenefits $ 289us-gaap_UnrecognizedTaxBenefits $ 296us-gaap_UnrecognizedTaxBenefits $ 292us-gaap_UnrecognizedTaxBenefits
Deferred Tax Assets, Operating Loss Carryforwards 600us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 614us-gaap_DeferredTaxAssetsOperatingLossCarryforwards    
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount (20)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate (13)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate (23)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate  
Current Income Tax Expense (Benefit) 350us-gaap_CurrentIncomeTaxExpenseBenefit 177us-gaap_CurrentIncomeTaxExpenseBenefit 475us-gaap_CurrentIncomeTaxExpenseBenefit  
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount 70us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (89)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential 341us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential  
Tax on Divestitures 109wft_TaxonDivestitures 0wft_TaxonDivestitures 0wft_TaxonDivestitures  
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount 222us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 264us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 108us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance  
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals 235us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals 224us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals    
Deferred Tax Assets, Tax Credit Carryforwards 103us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 115us-gaap_DeferredTaxAssetsTaxCreditCarryforwards    
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits 70us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits 54us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits    
Deferred Tax Assets, Inventory 70us-gaap_DeferredTaxAssetsInventory 51us-gaap_DeferredTaxAssetsInventory    
Deferred Tax Assets, Other 108us-gaap_DeferredTaxAssetsOther 79us-gaap_DeferredTaxAssetsOther    
Deferred Tax Assets, Valuation Allowance 732us-gaap_DeferredTaxAssetsValuationAllowance 554us-gaap_DeferredTaxAssetsValuationAllowance    
Deferred Tax Assets, Net of Valuation Allowance 454us-gaap_DeferredTaxAssetsNet 583us-gaap_DeferredTaxAssetsNet    
Deferred Tax Liabilities, Property, Plant and Equipment 324us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 415us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment    
Deferred Tax Liabilities, Goodwill and Intangible Assets 206us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets 221us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets    
Deferred Tax Liabilities, Tax Deferred Income 22us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome 6us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome    
Deferred Tax Liabilities, Other 21us-gaap_DeferredTaxLiabilitiesOther 22us-gaap_DeferredTaxLiabilitiesOther    
Deferred Tax Liabilities, Gross 573us-gaap_DeferredIncomeTaxLiabilities 664us-gaap_DeferredIncomeTaxLiabilities    
Deferred Tax Assets, Net (119)us-gaap_DeferredTaxAssetsLiabilitiesNet (81)us-gaap_DeferredTaxAssetsLiabilitiesNet    
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions 23us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions 64us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions 8us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions  
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions 35us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions 12us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions 1us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions  
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions 2us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 31us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 29us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions  
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities 24us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities 60us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities 14us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities  
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations 9us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations 19us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations 19us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations  
Unrecognized Tax Benefits, Increase (Decrease) Resulting from Foreign Currency Translation (11)wft_UnrecognizedTaxBenefitsIncreaseDecreaseResultingfromForeignCurrencyTranslation (11)wft_UnrecognizedTaxBenefitsIncreaseDecreaseResultingfromForeignCurrencyTranslation 1wft_UnrecognizedTaxBenefitsIncreaseDecreaseResultingfromForeignCurrencyTranslation  
Effective Income Tax Rate Reconciliation, Tax Contingency, Amount (97)us-gaap_IncomeTaxReconciliationTaxContingencies (18)us-gaap_IncomeTaxReconciliationTaxContingencies 36us-gaap_IncomeTaxReconciliationTaxContingencies  
Total deferred benefit 66us-gaap_DeferredIncomeTaxExpenseBenefit 33us-gaap_DeferredIncomeTaxExpenseBenefit 13us-gaap_DeferredIncomeTaxExpenseBenefit  
Income tax benefit (provision) $ (284)us-gaap_IncomeTaxExpenseBenefit $ (144)us-gaap_IncomeTaxExpenseBenefit $ (462)us-gaap_IncomeTaxExpenseBenefit