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Earnings per Share (Unaudited) Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Net income from continuing operations	$ 828	$ 268
Net income from continuing operations attributable to noncontrolling interests	125	75
Undistributed earnings allocated to participating securities	4	3
Net income from continuing operations attributable to common stockholders	699	190
Net (loss) income from discontinued operations	(11)	38
Net income from discontinued operations attributable to noncontrolling interests	0	3
Net (loss) income from discontinued operations attributable to common stockholders	(11)	35
Net income attributable to common stockholders	$ 688	$ 225
Basic	1,449	1,446
Add shares issuable upon exercise or vesting of dilutive stock options and restricted stock units	9	8
Diluted weighted-average shares of common stock outstanding	1,458	1,454
Basic and diluted net income (loss) per share attributable to common stockholders
Continuing operations	$ 0.48	$ 0.13
Discontinued operations	(0.01)	0.03
Basic and diluted net income (loss) per share attributable to common stockholders:	$ 0.47	$ 0.16
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	4
Dilutive Securities Excluded from Computation of EPS Amount	33	44

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