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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2020
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The following table shows how we computed basic and diluted earnings per common share for the three and nine months ended September 30, 2020 and 2019 (dollars and share data in millions):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2020 |  | 2019 |  | 2020 |  | 2019
Net (loss) income | $ | (393 | ) |  | $ | 187 |  |  | $ | (981 | ) |  | $ | 408 |
Weighted average basic shares | 272.4 |  |  | 294.0 |  |  | 274.3 |  |  | 300.1 |
Effect of dilutive securities | — |  |  | 1.9 |  |  | — |  |  | 1.7 |
Weighted average diluted shares | 272.4 |  |  | 295.9 |  |  | 274.3 |  |  | 301.8 |
(Loss) earnings per common share |  |  |  |  |  |  |
Basic | $ | (1.44 | ) |  | $ | 0.63 |  |  | $ | (3.58 | ) |  | $ | 1.36 |
Diluted | $ | (1.44 | ) |  | $ | 0.63 |  |  | $ | (3.58 | ) |  | $ | 1.35 |

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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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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