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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, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net income from continuing operations	$ 75	$ 828
Net income from continuing operations attributable to noncontrolling interests	(45)	(125)
Undistributed earnings allocated to participating securities	(3)	(4)
Net income from continuing operations attributable to common stockholders	27	699
Net gain (loss) from discontinued operations	1	(11)
Net income (loss) from discontinued operations attributable to common stockholders	1	(11)
Net income attributable to common stockholders	$ 28	$ 688
Basic weighted-average shares of common stock outstanding	1,451	1,449
Add shares issuable upon exercise or vesting of dilutive stock options and restricted stock unitsa	6	9
Diluted weighted-average shares of common stock outstanding	1,457	1,458
Earnings Per Share, Basic and Diluted [Abstract]
Income (Loss) from Continuing Operations, Per Basic and Diluted Share	$ 0.02	$ 0.48
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic and Diluted Share	0	(0.01)
Earnings Per Share, Basic and Diluted	$ 0.02	$ 0.47
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	3	4
Dilutive Securities Excluded from Computation of EPS Amount	39	33

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