Loss Per Share (Basic and Diluted) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Numerator for loss per share, basic and diluted
Net loss attributable to controlling interest	$ (592)	$ (567)	$ (1,255)
Denominator for loss per share, basic and diluted
Weighted-average shares outstanding (in shares)	636.0	614.0	611.0
Effect of share-based awards (in shares)	1.0	1.0	1.0
Weighted-average shares for per share calculation, basic (in shares)	637.0	615.0	612.0
Weighted-average shares for per share calculation, diluted (in shares)	637.0	615.0	612.0
Loss per share, basic (in dollars per share)	$ (0.93)	$ (0.92)	$ (2.05)
Loss per share, diluted (in dollars per share)	$ (0.93)	$ (0.92)	$ (2.05)
Share-based awards
Denominator for loss per share, basic and diluted
Securities excluded from earnings per share calculation (in shares)	12.6	10.8	12.0
Convertible debt
Denominator for loss per share, basic and diluted
Securities excluded from earnings per share calculation (in shares)	104.4	84.0	84.0
0.50% Exchangeable Senior Bonds due January 2023
Denominator for loss per share, basic and diluted
Debt instrument interest rate stated percentage	0.50%
2.50% Senior Guaranteed Exchangeable Bonds due January 2027
Denominator for loss per share, basic and diluted
Debt instrument interest rate stated percentage	2.50%
4.00% Senior Guaranteed Exchangeable Bonds due December 2025
Denominator for loss per share, basic and diluted
Debt instrument interest rate stated percentage	4.00%

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

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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- Definition

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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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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