Loss per Share (Weighted Average Shares Outstanding) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net Loss Attributable to Weatherford	$ (174)	$ (821)	$ (1,721)	$ (1,618)
Weighted Average Shares Outstanding, Basic and Diluted (in shares)	70	1,004	70	1,004
Loss Per Share, Basic & Diluted (in dollars per share)	$ (2.48)	$ (0.82)	$ (24.58)	$ (1.61)