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Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator for loss per share, basic
Net loss attributable to controlling interest	$ (409)	$ (1,417)	$ (1,754)	$ (3,016)
Net loss available to shareholders	$ (409)	$ (1,417)	$ (1,754)	$ (3,016)
Denominator for loss per share, basic
Weighted-average shares outstanding	463.0	391.0	454.0	391.0
Weighted-average shares for per share calculation, basic	463.0	391.0	454.0	391.0
Per share loss, basic (in dollars per share)	$ (0.88)	$ (3.62)	$ (3.86)	$ (7.72)
Numerator for loss per share, diluted
Net loss attributable to controlling interest	$ (409)	$ (1,417)	$ (1,754)	$ (3,016)
Net loss available to shareholders	$ (409)	$ (1,417)	$ (1,754)	$ (3,016)
Denominator for loss per share, diluted
Weighted-average shares outstanding	463.0	391.0	454.0	391.0
Weighted-average shares for per share calculation, diluted	463.0	391.0	454.0	391.0
Per share loss, diluted (in dollars per share)	$ (0.88)	$ (3.62)	$ (3.86)	$ (7.72)
Share-based awards
Anti-dilutive securities
Securities excluded from earnings per share calculation (in shares)	10.7	5.6	10.7	4.7
0.50% Exchangeable Bonds due January 2023
Anti-dilutive securities
Securities excluded from earnings per share calculation (in shares)	84.0		74.9

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