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Earnings Per Share Of Common Stock (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jan. 31, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Earnings Per Share [Abstract] |  |  |  |  |  |
Amount of beneficial conversion |  | $ 296 |  |  | $ 296 | $ 0
EPS of Common Stock |  |  |  |  |  |
Income from continuing operations |  |  | $ 267 | $ 219 | 444 | 476
Less: Preferred dividends |  |  | 0 | 0 | (43) | 0
Less: Amortization of beneficial conversion feature |  |  | (148) | 0 | (261) | 0
Less: Undistributed earnings allocated to preferred shareholders |  |  | (13) | 0 | 0 | 0
Income from continuing operations available to common stockholders |  |  | 106 | 219 | 140 | 476
Discontinued operations, net of tax | [1] |  | 32 | (45) | 1,224 | (97)
Less: Undistributed earnings allocated to preferred shareholders |  |  | (4) | 0 | 0 | 0
Income (loss) from discontinued operations available to common stockholders |  |  | 28 | (45) | 1,224 | (97)
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS |  |  | $ 134 | $ 174 | $ 1,364 | $ 379
Share Count information: |  |  |  |  |  |
Weighted average number of basic shares outstanding (in shares) |  |  | 477 | 444 | 477 | 443
Assumed exercise of dilutive stock options and awards (in shares) |  |  | 2 | 1 | 1 | 1
Weighted average number of diluted shares outstanding |  |  | 479 | 445 | 478 | 444
Income available to common stockholders, per common share: |  |  |  |  |  |
Income from continuing operations, basic (in dollars per share) |  |  | $ 0.22 | $ 0.49 | $ 0.29 | $ 1.07
Discontinued operations, basic (in dollars per share) |  |  | 0.06 | (0.10) | 2.57 | (0.21)
Basic - Net Income Attributable to Common Stockholders (in dollars per share) |  |  | 0.28 | 0.39 | 2.86 | 0.86
Income from continuing operations, diluted (in dollars per share) |  |  | 0.22 | 0.49 | 0.29 | 1.07
Discontinued operations, diluted (in dollars per share) |  |  | 0.06 | (0.10) | 2.56 | (0.22)
Diluted - Net Income Attributable to Common Stockholders (in dollars per share) |  |  | $ 0.28 | $ 0.39 | $ 2.85 | $ 0.85
Stock Options |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |
Shares excluded from the calculation of diluted shares outstanding, in shares |  |  | 1 | 1 | 1 | 1
Preferred Stock |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |
Shares excluded from the calculation of diluted shares outstanding, in shares |  |  | 59 |  | 59 |
[1] | Net of income tax benefits of $30 million and $15 million for the three months ended June 30, 2018 and 2017, respectively, and income tax benefits of $920 million and $41 million for the six months ended June 30, 2018 and 2017, respectively.

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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