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Earnings per Common Share (Tables) | 9 Months Ended
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Sep. 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 September 30, |  | Nine months ended September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net income | $ | 666 |  |  | $ | 520 |  |  | $ | 1,940 |  |  | $ | 1,037 |
Less: Preferred stock dividends | 29 |  |  | 29 |  |  | 87 |  |  | 87 |
Net income applicable to common shareholders (1) | $ | 637 |  |  | $ | 491 |  |  | $ | 1,853 |  |  | $ | 950 |
Denominator: |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding | 361.3 |  |  | 371.5 |  |  | 363.5 |  |  | 374.4 |
Effect of dilutive potential common shares: |  |  |  |  |  |  |  |  |  |  |
Stock options | 4.4 |  |  | 3.2 |  |  | 4.3 |  |  | 3.3 |
Restricted stock units (non-participating) and performance stock awards | 1.4 |  |  | 1.2 |  |  | 1.3 |  |  | 1.2 |
Weighted average common and dilutive potential common shares outstanding | 367.1 |  |  | 375.9 |  |  | 369.1 |  |  | 378.9 |
Earnings per common share - Basic | $ | 1.76 |  |  | $ | 1.32 |  |  | $ | 5.10 |  |  | $ | 2.54 |
Earnings per common share - Diluted | $ | 1.74 |  |  | $ | 1.31 |  |  | $ | 5.02 |  |  | $ | 2.51 |
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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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