Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Performance bonds with various domestic and international institutions.

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Short-term Borrowings and Current Portion of Long-term Debt (Schedule of Short-term Debt) (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended
	Apr. 10, 2014	May 02, 2013	Mar. 31, 2015	Dec. 31, 2014
Short-term Debt [Line Items]
Total short-term borrowings			$ 1,158us-gaap_ShortTermBorrowings	$ 677us-gaap_ShortTermBorrowings
Current portion of long-term debt			396	50
Short-term borrowings and current portion of long-term debt			1,554us-gaap_DebtCurrent	727us-gaap_DebtCurrent
Performance bonds			278wft_PerformanceBonds
Commercial paper program [Member]
Short-term Debt [Line Items]
Total short-term borrowings			130	245
Revolving credit facility [Member]
Short-term Debt [Line Items]
Total short-term borrowings			625	0
364-day term loan facility [Member]
Short-term Debt [Line Items]
Total short-term borrowings				175
Letters of credit outstanding, amount			175
Debt instrument, term	364 days	364 days
Other short-term bank loans [Member]
Short-term Debt [Line Items]
Total short-term borrowings			$ 228	$ 257