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Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Numerator for loss per share, basic
Net loss attributable to controlling interest	$ (392)	$ (171)
Denominator for loss per share, basic
Weighted-average shares outstanding	613.0	610.0
Effect of share-based awards and other equity instruments	1.0	1.0
Weighted-average shares for per share calculation, basic	614.0	611.0
Loss per share, basic (in dollars per share)	$ (0.64)	$ (0.28)
Numerator for loss per share, diluted
Net loss attributable to controlling interest	$ (392)	$ (171)
Denominator for loss per share, diluted
Weighted-average shares outstanding	613.0	610.0
Effect of share-based awards and other equity instruments	1.0	1.0
Weighted-average shares for per share calculation, diluted	614.0	611.0
Loss per share, diluted (in dollars per share)	$ (0.64)	$ (0.28)
Share-based awards
Anti-dilutive securities
Securities excluded from earnings per share calculation (in shares)	11.1	12.1
0.50% Exchangeable Bonds due January 2023
Anti-dilutive securities
Securities excluded from earnings per share calculation (in shares)	84.0	84.0

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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