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Earnings per Common Share (Tables) | 6 Months Ended
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Jun. 30, 2020
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted | The following table presents the calculation of basic and diluted earnings per common share.
|  | Three months ended June 30, |  | Six months ended June 30,
($ in millions, except per share data; shares in thousands) (a) |  | 2020 |  | 2019 |  | 2020 |  | 2019
Net income (loss) from continuing operations |  | $ | 242 |  |  | $ | 584 |  |  | $ | (77 | ) |  | $ | 959 |
Loss from discontinued operations, net of tax |  | (1 | ) |  | (2 | ) |  | (1 | ) |  | (3 | )
Net income (loss) attributable to common stockholders |  | $ | 241 |  |  | $ | 582 |  |  | $ | (78 | ) |  | $ | 956 |
Basic weighted-average common shares outstanding (b) |  | 375,051 |  |  | 398,100 |  |  | 375,387 |  |  | 401,098 |
Diluted weighted-average common shares outstanding (b) (c) |  | 375,762 |  |  | 399,916 |  |  | 375,387 |  |  | 402,921 |
Basic earnings per common share |  |  |  |  |  |  |  |
Net income (loss) from continuing operations |  | $ | 0.65 |  |  | $ | 1.47 |  |  | $ | (0.20 | ) |  | $ | 2.39 |
Loss from discontinued operations, net of tax |  | — |  |  | — |  |  | — |  |  | (0.01 | )
Net income (loss) |  | $ | 0.64 |  |  | $ | 1.46 |  |  | (0.21 | ) |  | 2.39 |
Diluted earnings per common share |  |  |  |  |  |  |  |
Net income (loss) from continuing operations |  | $ | 0.64 |  |  | $ | 1.46 |  |  | (0.20 | ) |  | 2.38 |
Loss from discontinued operations, net of tax |  | — |  |  | — |  |  | — |  |  | (0.01 | )
Net income (loss) |  | $ | 0.64 |  |  | $ | 1.46 |  |  | $ | (0.21 | ) |  | $ | 2.37 |
(a) | Figures in the table may not recalculate exactly due to rounding. Earnings per share is calculated based on unrounded numbers.
(b) | Includes shares related to share-based compensation that vested but were not yet issued.
(c) Due to the antidilutive effect of the net loss from continuing operations for the six months ended June 30, 2020, basic weighted-average common shares outstanding was used to calculate basic and diluted earnings per share. During the three months and six months ended June 30, 2020, there were 2.3 million and 2.4 million, respectively, in shares underlying share-based awards excluded because their inclusion would have been antidilutive. There were no antidilutive shares during the three months and six months ended June 30, 2019.

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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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