Other Intangible Assets (Schedule of Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Amount	$ 1,184	$ 1,369
Finite-Lived Intangible Assets Held For Sale		(60)
Amortization	(733)	(743)
Impairment	(11)
Assets	440	566
Acquired technology [Member]
Finite-Lived Intangible Assets [Line Items]
Amount	420	417
Finite-Lived Intangible Assets Held For Sale		(4)
Amortization	(287)	(238)
Impairment	0
Assets	133	175
Licenses [Member]
Finite-Lived Intangible Assets [Line Items]
Amount	242	261
Finite-Lived Intangible Assets Held For Sale		(1)
Amortization	(169)	(161)
Impairment	0
Assets	73	99
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Amount	232	271
Finite-Lived Intangible Assets Held For Sale		(4)
Amortization	(117)	(129)
Impairment	0
Assets	115	138
Customer relationships and contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Amount	205	329
Finite-Lived Intangible Assets Held For Sale		(46)
Amortization	(122)	(163)
Impairment	(5)
Assets	78	120
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Amount	85	91
Finite-Lived Intangible Assets Held For Sale		(5)
Amortization	(38)	(52)
Impairment	(6)
Assets	$ 41	$ 34

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph ((a)(1),(b))

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

+ Details

Name:	us-gaap_IntangibleAssetsNetExcludingGoodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Finite-Lived Intangible Assets, Accumulated Impairment Loss

+ References

No definition available.

+ Details

Name:	wft_FiniteLivedIntangibleAssetsAccumulatedImpairmentLoss
Namespace Prefix:	wft_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Finite-Lived Intangible Assets Held For Sale

+ References

No definition available.

+ Details

Name:	wft_FiniteLivedIntangibleAssetsHeldForSale
Namespace Prefix:	wft_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_DevelopedTechnologyRightsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_LicensingAgreementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_OtherIntangibleAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_PatentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=wft_CustomerRelationshipsandContractsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: