Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

+ Details

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

- Definition

The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39896-112707

+ Details

Name:	us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

+ Details

Name:	us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

+ Details

Name:	us-gaap_Revenues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	srt_ProductOrServiceAxis=wft_ProductionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ProductOrServiceAxis=wft_CompletionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ProductOrServiceAxis=wft_DrillingandEvaluationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ProductOrServiceAxis=wft_WellConstructionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ProductOrServiceAxis=wft_A606revenueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=wft_WesternHemisphereMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=wft_EasternHemisphereMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Revenues - Major Product Line (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Rental Revenues	$ 75		$ 270
Total Revenues	1,444	$ 1,460	4,315	$ 4,209
Production
Disaggregation of Revenue [Line Items]
Total Excluding Rental Revenues	382		1,157
Rental Revenues	1		1
Total Revenues	383		1,158
Completions
Disaggregation of Revenue [Line Items]
Total Excluding Rental Revenues	303		899
Rental Revenues	0		1
Total Revenues	303		900
Drilling and Evaluation
Disaggregation of Revenue [Line Items]
Total Excluding Rental Revenues	353		1,024
Rental Revenues	4		32
Total Revenues	357		1,056
Well Construction
Disaggregation of Revenue [Line Items]
Total Excluding Rental Revenues	331		965
Rental Revenues	70		236
Total Revenues	401		1,201
606 revenue [Member]
Disaggregation of Revenue [Line Items]
Total Excluding Rental Revenues	1,369		4,045
Western Hemisphere
Disaggregation of Revenue [Line Items]
Total Excluding Rental Revenues	705		2,089
Western Hemisphere \| Production
Disaggregation of Revenue [Line Items]
Total Excluding Rental Revenues	293		887
Western Hemisphere \| Completions
Disaggregation of Revenue [Line Items]
Total Excluding Rental Revenues	154		459
Western Hemisphere \| Drilling and Evaluation
Disaggregation of Revenue [Line Items]
Total Excluding Rental Revenues	152		449
Western Hemisphere \| Well Construction
Disaggregation of Revenue [Line Items]
Total Excluding Rental Revenues	106		294
Eastern Hemisphere
Disaggregation of Revenue [Line Items]
Total Excluding Rental Revenues	664		1,956
Eastern Hemisphere \| Production
Disaggregation of Revenue [Line Items]
Total Excluding Rental Revenues	89		270
Eastern Hemisphere \| Completions
Disaggregation of Revenue [Line Items]
Total Excluding Rental Revenues	149		440
Eastern Hemisphere \| Drilling and Evaluation
Disaggregation of Revenue [Line Items]
Total Excluding Rental Revenues	201		575
Eastern Hemisphere \| Well Construction
Disaggregation of Revenue [Line Items]
Total Excluding Rental Revenues	$ 225		$ 671