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Earnings per Common Share (Tables) | 6 Months Ended
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Jun. 30, 2017
Earnings Per Share [Abstract] |
Computation of basic and diluted earnings per common share | The computation of basic and diluted earnings per common share is presented in the following table.
($ in millions, except per share data) | Three months ended June 30, |  | Six months ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net income | $ | 579 |  |  | $ | 271 |  |  | $ | 1,274 |  |  | $ | 517 |
Less: Preferred stock dividends | 29 |  |  | 29 |  |  | 58 |  |  | 58 |
Net income applicable to common shareholders (1) | $ | 550 |  |  | $ | 242 |  |  | $ | 1,216 |  |  | $ | 459 |
Denominator: |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding | 363.6 |  |  | 373.6 |  |  | 364.6 |  |  | 375.8 |
Effect of dilutive potential common shares: |  |  |  |  |  |  |  |  |  |  |
Stock options | 4.3 |  |  | 3.4 |  |  | 4.2 |  |  | 3.4 |
Restricted stock units (non-participating) and performance stock awards | 1.1 |  |  | 1.1 |  |  | 1.3 |  |  | 1.3 |
Weighted average common and dilutive potential common shares outstanding | 369.0 |  |  | 378.1 |  |  | 370.1 |  |  | 380.5 |
Earnings per common share - Basic | $ | 1.51 |  |  | $ | 0.65 |  |  | $ | 3.34 |  |  | $ | 1.22 |
Earnings per common share - Diluted | $ | 1.49 |  |  | $ | 0.64 |  |  | $ | 3.29 |  |  | $ | 1.21 |
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(1) | Net income applicable to common shareholders is net income less preferred stock dividends.

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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/2003/role/presentationRef -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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