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Earnings per Share (Unaudited) Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Earnings Per Share [Abstract]        
Net income (loss) from continuing operations $ 242 $ 292 $ 836 $ (4,034)
Net loss (income) from continuing operations attributable to noncontrolling interests (35) 37 106 146
Preferred dividends on redeemable noncontrolling interest 0 10 0 31
Undistributed earnings allocated to participating securities 3 3 3 3
Net income (loss) from continuing operations attributable to common stockholders 274 242 727 (4,214)
Net income (loss) from discontinued operations 3 (6) 50 (191)
Net income from discontinued operations attributable to noncontrolling interests 0 22 4 44
Net income (loss) from discontinued operations attributable to common stockholders 3 (28) 46 (235)
Net income (loss) attributable to common stockholders $ 277 $ 214 $ 773 $ (4,449)
Basic 1,448 1,346 1,447 1,289
Add shares issuable upon exercise or vesting of dilutive stock options and restricted stock units 6 5 6 0
Diluted weighted-average shares of common stock outstanding 1,454 1,351 1,453 1,289
Basic and diluted net income (loss) per share attributable to common stockholders        
Continuing operations $ 0.19 $ 0.18 $ 0.50 $ (3.27)
Discontinued operations 0.00 (0.02) 0.03 (0.18)
Basic and diluted net income (loss) per share attributable to common stockholders: $ 0.19 $ 0.16 $ 0.53 $ (3.45)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount       12
Dilutive Securities Excluded from Computation of EPS Amount 38 46 42 46