Accounts Receivable Factoring (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Receivables [Abstract]
Accounts Receivable Sold	$ 6	$ 84
Cash Proceeds from Sale of Accounts Receivable	$ 6	$ 81

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:	instant