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Basis of Presentation and Significant Accounting Policies and Practices (Tables) | 3 Months Ended
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Mar. 31, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract] |
Schedule of Earnings per Share, Basic and Diluted | Computation and reconciliation of earnings per common share are as follows (shares in millions):
| For Three Months Ended March 31, |
| 2019 |  |  | 2018 |
| Net |  |  |  |  |  |  |  |  |  | Net |  |  |  |  |  |  |  |
| Income |  |  | Shares |  |  | EPS |  |  | Income |  |  | Shares |  |  | EPS |
Basic EPS: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ |  | 1,217 |  |  |  |  |  |  |  |  |  |  |  | $ |  | 1,366 |  |  |  |  |  |  |  |  |  |
Income allocated to RSUs |  |  | (8 | ) |  |  |  |  |  |  |  |  |  |  |  |  | (11 | ) |  |  |  |  |  |  |  |  |
Income allocated to common stock | $ |  | 1,209 |  |  |  | 939 |  |  | $ |  | 1.29 |  |  | $ |  | 1,355 |  |  |  | 983 |  |  | $ |  | 1.38 |
Dilutive effect of stock compensation plans |  |  |  |  |  |  | 17 |  |  |  |  |  |  |  |  |  |  |  |  |  | 22 |  |  |  |  |  |
Diluted EPS: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ |  | 1,217 |  |  |  |  |  |  |  |  |  |  |  | $ |  | 1,366 |  |  |  |  |  |  |  |  |  |
Income allocated to RSUs |  |  | (8 | ) |  |  |  |  |  |  |  |  |  |  |  |  | (11 | ) |  |  |  |  |  |  |  |  |
Income allocated to common stock | $ |  | 1,209 |  |  |  | 956 |  |  | $ |  | 1.26 |  |  | $ |  | 1,355 |  |  |  | 1,005 |  |  | $ |  | 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://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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