Accounts Receivable Factoring (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Receivables [Abstract]
Accounts Receivable Sold	$ 11	$ 37	$ 34	$ 199
Cash Proceeds from Sale of Accounts Receivable	$ 10	$ 34	$ 30	$ 186

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