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Earnings (Loss) Per Common Share (Tables) | 9 Months Ended
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Sep. 30, 2019
Earnings Per Share [Abstract] |
Schedule of basic and diluted earnings per common share | Basic and diluted earnings (loss) per common share were calculated as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
| (Dollars in millions, except per share amounts, shares in thousands)
Income (Loss) (Numerator): |  |  |  |  |  |  |
Net income (loss) | $ | 302 |  |  | 272 |  |  | (5,492 | ) |  | 679 |
Net income (loss) applicable to common stock for computing basic earnings per common share | 302 |  |  | 272 |  |  | (5,492 | ) |  | 679 |
Net income (loss) as adjusted for purposes of computing diluted earnings per common share | $ | 302 |  |  | 272 |  |  | (5,492 | ) |  | 679 |
Shares (Denominator): |  |  |  |  |  |  |
Weighted-average number of shares: |  |  |  |  |  |  |
Outstanding during period | 1,090,755 |  |  | 1,080,589 |  |  | 1,088,229 |  |  | 1,077,712 |
Non-vested restricted stock | (18,212 | ) |  | (13,685 | ) |  | (17,308 | ) |  | (12,302 | )
Weighted-average shares outstanding for computing basic earnings per common share | 1,072,543 |  |  | 1,066,904 |  |  | 1,070,921 |  |  | 1,065,410 |
Incremental common shares attributable to dilutive securities: |  |  |  |  |  |  |
Shares issuable under convertible securities | 10 |  |  | 10 |  |  | — |  |  | 10 |
Shares issuable under incentive compensation plans | 2,237 |  |  | 5,437 |  |  | — |  |  | 4,306 |
Number of shares as adjusted for purposes of computing diluted earnings (loss) per common share | 1,074,790 |  |  | 1,072,351 |  |  | 1,070,921 |  |  | 1,069,726 |
Basic earnings (loss) per common share | $ | 0.28 |  |  | 0.25 |  |  | (5.13 | ) |  | 0.64 |
Diluted earnings (loss) per common share (1) | $ | 0.28 |  |  | 0.25 |  |  | (5.13 | ) |  | 0.63 |
______________________________________________________________________ (1) For the nine months ended September 30, 2019, we excluded from the calculation of diluted loss per share 2.3 million shares, potentially issuable under incentive compensation plans or convertible securities, as their effect, if included, would have been anti-dilutive.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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