Loss per Share (Weighted Average Shares Outstanding) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Net Loss Attributable to Weatherford	$ (966)	$ (481)
Weighted Average Shares Outstanding, Basic and Diluted (in shares)	70	1,003
Loss Per Share, Basic & Diluted (in dollars per share)	$ (13.80)	$ (0.48)