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Earnings per Common Share (Tables) | 3 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
Computation of basic and diluted earnings per common share |
Computation of basic and diluted earnings per common share
($ in millions, except per share data) |  | Three months ended March 31,
| 2018 |  | 2017
Numerator: |  |  |  |
Net income |  | $ | 975 |  |  | $ | 695 |
Less: Preferred stock dividends |  | 29 |  |  | 29 |
Net income applicable to common shareholders (1) |  | $ | 946 |  |  | $ | 666 |
Denominator: |  |  |  |
Weighted average common shares outstanding |  | 354.1 |  |  | 365.7 |
Effect of dilutive potential common shares: |  |  |  |
Stock options |  | 4.1 |  |  | 4.2 |
Restricted stock units (non-participating) and performance stock awards |  | 1.7 |  |  | 1.4 |
Weighted average common and dilutive potential common shares outstanding |  | 359.9 |  |  | 371.3 |
Earnings per common share - Basic |  | $ | 2.67 |  |  | $ | 1.82 |
Earnings per common share - Diluted |  | $ | 2.63 |  |  | $ | 1.79 |
(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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