Accounts Receivable Factoring (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Receivables [Abstract]
Accounts Receivable Sold	$ 17	$ 78	$ 23	$ 162
Cash Proceeds from Sale of Accounts Receivable	$ 15	$ 71	$ 21	$ 152

Amount of receivables sold under an accounts receivable sales program.

No definition available.

Name:	wft_TransferofAccountsReceivableAccountedforasSalesCarryingValue
Namespace Prefix:	wft_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration