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Earnings per Share (Unaudited) Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended
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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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- Definition The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e1337-109256 + Details
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