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Earnings per Share (Unaudited) Earnings 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
Earnings Per Share [Abstract]
Net income (loss) from continuing operations	$ 326	$ (229)	$ 594	$ (4,326)
Net income from continuing operations attributable to noncontrolling interests	66	47	141	109
Preferred dividends on redeemable noncontrolling interest	0	10	0	21
Undistributed earnings allocated to participating securities	3	3	3	3
Net income (loss) from continuing operations attributable to common stockholders	257	(289)	450	(4,459)
Net income (loss) from discontinued operations	9	(181)	47	(185)
Net income from discontinued operations attributable to noncontrolling interests	1	12	4	22
Net income (loss) from discontinued operations attributable to common stockholders	8	(193)	43	(207)
Net income (loss) attributable to common stockholders	$ 265	$ (482)	$ 493	$ (4,666)
Basic	1,447	1,269	1,447	1,260
Add shares issuable upon exercise or vesting of dilutive stock options and restricted stock units	6	0	6	0
Diluted weighted-average shares of common stock outstanding	1,453	1,269	1,453	1,260
Basic and diluted net income (loss) per share attributable to common stockholders
Continuing operations	$ 0.18	$ (0.23)	$ 0.31	$ (3.54)
Discontinued operations	0.00	(0.15)	0.03	(0.16)
Basic and diluted net income (loss) per share attributable to common stockholders:	$ 0.18	$ (0.38)	$ 0.34	$ (3.70)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		12		11
Dilutive Securities Excluded from Computation of EPS Amount	44	46	44	47

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