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Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2016
Tax provision	$ 0us-gaap_IncomeTaxExpenseBenefit	$ 27us-gaap_IncomeTaxExpenseBenefit
Income (Loss) Before Income Taxes	(107)	(5)
Restructuring Charges	41us-gaap_RestructuringCharges	70us-gaap_RestructuringCharges
Devaluation of Venezuelan Bolivar	(26)	0
Discrete income before tax		116wft_DiscreteIncomeLossBeforeTax
Scenario, Forecast [Member]
Uncertain tax positions, estimated for next twelve months			$ (14)

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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