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Basis of presentation and significant accounting policies and practices (Tables) | 3 Months Ended
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Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Schedule of Earnings Per Share | Computation and reconciliation of earnings per common share are as follows (shares in millions):
| For Three Months Ended March 31,
| 2021 |  | 2020
| Net Income |  | Shares |  | EPS |  | Net Income |  | Shares |  | EPS
Basic EPS: |  |  |  |  |  |  |  |  |  |  |
Net income | $ | 1,753 |  |  |  |  |  |  | $ | 1,174 |  |  |  |  |
Income allocated to RSUs | (8) |  |  |  |  |  |  | (6) |  |  |  |  |
Income allocated to common stock | $ | 1,745 |  |  | 922 |  |  | $ | 1.89 |  |  | $ | 1,168 |  |  | 931 |  |  | $ | 1.25 |
Dilutive effect of stock compensation plans |  |  | 13 |  |  |  |  |  |  | 12 |  |  |
Diluted EPS: |  |  |  |  |  |  |  |  |  |  |
Net income | $ | 1,753 |  |  |  |  |  |  | $ | 1,174 |  |  |  |  |
Income allocated to RSUs | (8) |  |  |  |  |  |  | (6) |  |  |  |  |
Income allocated to common stock | $ | 1,745 |  |  | 935 |  |  | $ | 1.87 |  |  | $ | 1,168 |  |  | 943 |  |  | $ | 1.24 |

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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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