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Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Numerator for loss per share, basic
Net loss attributable to controlling interest									$ (1,255)	$ (1,996)	$ (3,127)
Denominator for loss per share, basic
Weighted-average shares outstanding									611.0	467.0	391.0
Effect of share-based awards and other equity instruments									1.0	1.0
Weighted-average shares for per share calculation, basic	613.0	613.0	612.0	611.0	506.0	463.0	462.0	438.0	612.0	468.0	391.0
Loss per share, basic (in dollars per share)	$ (0.08)	$ (1.35)	$ (0.34)	$ (0.28)	$ (0.48)	$ (0.88)	$ (2.46)	$ (0.48)	$ (2.05)	$ (4.27)	$ (8.00)
Numerator for loss per share, diluted
Net loss attributable to controlling interest									$ (1,255)	$ (1,996)	$ (3,127)
Denominator for loss per share, diluted
Weighted-average shares outstanding									611.0	467.0	391.0
Effect of share-based awards and other equity instruments									1.0	1.0
Weighted-average shares for per share calculation, diluted	613.0	613.0	612.0	611.0	506.0	463.0	462.0	438.0	612.0	468.0	391.0
Loss per share, diluted (in dollars per share)	$ (0.08)	$ (1.35)	$ (0.34)	$ (0.28)	$ (0.48)	$ (0.88)	$ (2.46)	$ (0.48)	$ (2.05)	$ (4.27)	$ (8.00)
Share-based awards
Anti-dilutive securities
Securities excluded from earnings per share calculation (in shares)									12.0	10.6	4.7
0.50% Exchangeable Bonds due January 2023
Anti-dilutive securities
Securities excluded from earnings per share calculation (in shares)									84.0	77.2

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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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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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