Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator for loss per share, basic
Net loss attributable to controlling interest	$ (497)	$ (208)	$ (889)	$ (379)
Denominator for loss per share, basic
Weighted-average shares outstanding	614.0	611.0	614.0	611.0
Effect of share-based awards and other equity instruments	1.0	1.0	1.0	1.0
Weighted-average shares for per share calculation, basic	615.0	612.0	615.0	612.0
Loss per share, basic (in dollars per share)	$ (0.81)	$ (0.34)	$ (1.45)	$ (0.62)
Numerator for loss per share, diluted
Net loss attributable to controlling interest	$ (497)	$ (208)	$ (889)	$ (379)
Denominator for loss per share, diluted
Weighted-average shares outstanding	614.0	611.0	614.0	611.0
Effect of share-based awards and other equity instruments	1.0	1.0	1.0	1.0
Weighted-average shares for per share calculation, diluted	615.0	612.0	615.0	612.0
Loss per share, diluted (in dollars per share)	$ (0.81)	$ (0.34)	$ (1.45)	$ (0.62)
Share-based awards
Anti-dilutive securities
Securities excluded from earnings per share calculation (in shares)	14.8	12.6	13.0	12.2
0.50% Exchangeable Bonds due January 2023
Anti-dilutive securities
Securities excluded from earnings per share calculation (in shares)	84.0	84.0	84.0	84.0

This element represents the weighted average total number of shares issued throughout the period including the first (beginning balance outstanding) and last (ending balance outstanding) day of the period before considering any reductions (for instance, shares held in treasury) to arrive at the weighted average number of shares outstanding. Weighted average relates to the portion of time within a reporting period that common shares have been issued and outstanding to the total time in that period. Such concept is used in determining the weighted average number of shares outstanding for purposes of calculating earnings per share (diluted).

No definition available.