Earnings per Share Emergence from Bankruptcy (Details) - Restructuring Support Agreement	Sep. 11, 2019
Percent of common stock exchanged for existing equity	1.00%
Percent of common stock exchanged for warrants	10.00%

Plan Of Reorganization, Pro Rata Share Of Subscription Rights, Note Holders, Percent

No definition available.

Name:	wft_PlanOfReorganizationProRataShareOfSubscriptionRightsNoteHoldersPercent
Namespace Prefix:	wft_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant