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Basis of presentation and significant accounting policies and practices (Tables) | 6 Months Ended
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Jun. 30, 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 June 30,
| 2021 |  | 2020
| Net Income |  | Shares |  | EPS |  | Net Income |  | Shares |  | EPS
Basic EPS: |  |  |  |  |  |  |  |  |  |  |
Net income | $ | 1,931 |  |  |  |  |  |  | $ | 1,380 |  |  |  |  |
Income allocated to RSUs | (7) |  |  |  |  |  |  | (7) |  |  |  |  |
Income allocated to common stock | $ | 1,924 |  |  | 923 |  |  | $ | 2.08 |  |  | $ | 1,373 |  |  | 916 |  |  | $ | 1.50 |
Dilutive effect of stock compensation plans |  |  | 14 |  |  |  |  |  |  | 11 |  |  |
Diluted EPS: |  |  |  |  |  |  |  |  |  |  |
Net income | $ | 1,931 |  |  |  |  |  |  | $ | 1,380 |  |  |  |  |
Income allocated to RSUs | (7) |  |  |  |  |  |  | (7) |  |  |  |  |
Income allocated to common stock | $ | 1,924 |  |  | 937 |  |  | $ | 2.05 |  |  | $ | 1,373 |  |  | 927 |  |  | $ | 1.48 |
| For Six Months Ended June 30,
| 2021 |  | 2020
| Net Income |  | Shares |  | EPS |  | Net Income |  | Shares |  | EPS
Basic EPS: |  |  |  |  |  |  |  |  |  |  |
Net income | $ | 3,684 |  |  |  |  |  |  | $ | 2,554 |  |  |  |  |
Income allocated to RSUs | (15) |  |  |  |  |  |  | (13) |  |  |  |  |
Income allocated to common stock | $ | 3,669 |  |  | 923 |  |  | $ | 3.98 |  |  | $ | 2,541 |  |  | 923 |  |  | $ | 2.75 |
Dilutive effect of stock compensation plans |  |  | 13 |  |  |  |  |  |  | 12 |  |  |
Diluted EPS: |  |  |  |  |  |  |  |  |  |  |
Net income | $ | 3,684 |  |  |  |  |  |  | $ | 2,554 |  |  |  |  |
Income allocated to RSUs | (15) |  |  |  |  |  |  | (13) |  |  |  |  |
Income allocated to common stock | $ | 3,669 |  |  | 936 |  |  | $ | 3.92 |  |  | $ | 2,541 |  |  | 935 |  |  | $ | 2.72 |

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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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