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Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Numerator for earnings (loss) per share, basic
Income (loss) from continuing operations attributable to controlling interest	$ (1,690)	$ 81	$ (1,599)	$ 317
Undistributed earnings allocable to participating securities		(1)		(3)
Income (loss) from continuing operations available to shareholders	$ (1,690)	$ 80	$ (1,599)	$ 314
Denominator for earnings (loss) per share, basic
Weighted-average shares outstanding	391.0	365.0	391.0	365.0
Weighted-average shares for per share calculation, basic	391.0	365.0	391.0	365.0
Per share earnings (loss) from continuing operations, basic	$ (4.32)	$ 0.22	$ (4.09)	$ 0.86
Numerator for earnings (loss) per share, diluted
Income (loss) from continuing operations attributable to controlling interest	$ (1,690)	$ 81	$ (1,599)	$ 317
Undistributed earnings allocable to participating securities		(1)		(4)
Income (loss) from continuing operations available to shareholders	$ (1,690)	$ 80	$ (1,599)	$ 313
Denominator for earnings (loss) per share, diluted
Weighted-average shares outstanding	391.0	365.0	391.0	365.0
Weighted-average shares for per share calculation, diluted	391.0	365.0	391.0	365.0
Per share earnings (loss) from continuing operations, diluted	$ (4.32)	$ 0.22	$ (4.09)	$ 0.86
Share-based awards
Anti-dilutive securities
Share-based awards excluded from earnings per share calculation (in shares)	5.7	4.5	3.7	4.0

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