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Short-term Borrowings and Current Portion of Long-term Debt (Narrative) (Details) (USD $)	0 Months Ended		3 Months Ended
	Apr. 10, 2014	May 02, 2013	Mar. 31, 2015	Apr. 09, 2015
Short-term Debt [Line Items]
Credit agreement, maximum capacity			$ 1,500,000,000
Performance bonds			278,000,000wft_PerformanceBonds
Revolving credit facility [Member]
Short-term Debt [Line Items]
Credit agreement, maximum capacity			2,250,000,000
Commercial paper program and letters of credit [Member]
Short-term Debt [Line Items]
Credit agreement, maximum capacity			2,250,000,000
Committed letters of credit [Member]
Short-term Debt [Line Items]
Letters of credit outstanding, amount			28,000,000
364-day term loan facility [Member]
Short-term Debt [Line Items]
Credit agreement, maximum capacity	400,000,000
Letters of credit outstanding, amount			175,000,000
Debt instrument, term	364 days	364 days
Domestic and foreign facility [Member]
Short-term Debt [Line Items]
Short term borrowings			228,000,000
Uncommitted letters of credit [Member]
Short-term Debt [Line Items]
Letters of credit outstanding, amount			573,000,000
Maximum [Member] \| Revolving credit facility [Member]
Short-term Debt [Line Items]
Ratio of indebtedness to net capital percent required			0.6
Bi-Lateral Revolver Debt [Member] \| Domestic and foreign facility [Member]
Short-term Debt [Line Items]
Short term borrowings			180,000,000
London Interbank Offered Rate (LIBOR) [Member] \| Domestic and foreign facility [Member]
Short-term Debt [Line Items]
Interest rate at period end			1.57%
Extinguishment of Debt Senior Notes [Member] \| Senior Notes, 5.50% due 2016 [Member]
Short-term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			5.50%
Extinguishment of Debt Senior Notes [Member] \| Senior Notes, 4.50% due 2022 [Member]
Short-term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			4.50%
Extinguishment of Debt Senior Notes [Member] \| Senior Notes, 5.95 Percent due 2012 [Member]
Short-term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			5.95%
Extinguishment of Debt Senior Notes [Member] \| Senior Notes, 6.50% due 2036 [Member]
Short-term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			6.50%
Extinguishment of Debt Senior Notes [Member] \| Senior Notes, 6.75% due 2040 [Member]
Short-term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			6.75%
364-day term loan facility [Member] \| Subsequent Event [Member] \| 364-day term loan facility [Member]
Short-term Debt [Line Items]
Letters of credit outstanding, amount				175,000,000
Extinguishment of Debt Senior Notes [Member] \| Extinguishment of Debt Senior Notes [Member]
Short-term Debt [Line Items]
Long-term Debt			160,000,000
Gain (Loss) on Repurchase of Debt Instrument			$ 12,000,000