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Basis of Presentation and Significant Accounting Policies and Practices (Tables) | 9 Months Ended
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Sep. 30, 2018
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 September 30, |
| 2018 |  |  | 2017 |
| Net |  |  |  |  |  |  |  |  |  | Net |  |  |  |  |  |  |  |
| Income |  |  | Shares |  |  | EPS |  |  | Income |  |  | Shares |  |  | EPS |
Basic EPS: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ |  | 1,570 |  |  |  |  |  |  |  |  |  |  |  | $ |  | 1,285 |  |  |  |  |  |  |  |  |  |
Income allocated to RSUs |  |  | (12 | ) |  |  |  |  |  |  |  |  |  |  |  |  | (11 | ) |  |  |  |  |  |  |  |  |
Income allocated to common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
for basic EPS calculation | $ |  | 1,558 |  |  |  | 969 |  |  | $ |  | 1.61 |  |  | $ |  | 1,274 |  |  |  | 988 |  |  | $ |  | 1.29 |
Adjustment for dilutive shares: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock compensation plans |  |  |  |  |  |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 |  |  |  |  |  |
Diluted EPS: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ |  | 1,570 |  |  |  |  |  |  |  |  |  |  |  | $ |  | 1,285 |  |  |  |  |  |  |  |  |  |
Income allocated to RSUs |  |  | (11 | ) |  |  |  |  |  |  |  |  |  |  |  |  | (11 | ) |  |  |  |  |  |  |  |  |
Income allocated to common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
for diluted EPS calculation | $ |  | 1,559 |  |  |  | 989 |  |  | $ |  | 1.58 |  |  | $ |  | 1,274 |  |  |  | 1,008 |  |  | $ |  | 1.26 |
| For Nine Months Ended September 30, |
| 2018 |  |  | 2017 |
| Net |  |  |  |  |  |  |  |  |  | Net |  |  |  |  |  |  |  |
| Income |  |  | Shares |  |  | EPS |  |  | Income |  |  | Shares |  |  | EPS |
Basic EPS: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ |  | 4,341 |  |  |  |  |  |  |  |  |  |  |  | $ |  | 3,338 |  |  |  |  |  |  |  |  |  |
Income allocated to RSUs |  |  | (34 | ) |  |  |  |  |  |  |  |  |  |  |  |  | (32 | ) |  |  |  |  |  |  |  |  |
Income allocated to common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
for basic EPS calculation | $ |  | 4,307 |  |  |  | 976 |  |  | $ |  | 4.41 |  |  | $ |  | 3,306 |  |  |  | 993 |  |  | $ |  | 3.33 |
Adjustment for dilutive shares: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock compensation plans |  |  |  |  |  |  | 21 |  |  |  |  |  |  |  |  |  |  |  |  |  | 21 |  |  |  |  |  |
Diluted EPS: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ |  | 4,341 |  |  |  |  |  |  |  |  |  |  |  | $ |  | 3,338 |  |  |  |  |  |  |  |  |  |
Income allocated to RSUs |  |  | (34 | ) |  |  |  |  |  |  |  |  |  |  |  |  | (31 | ) |  |  |  |  |  |  |  |  |
Income allocated to common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
for diluted EPS calculation | $ |  | 4,307 |  |  |  | 997 |  |  | $ |  | 4.32 |  |  | $ |  | 3,307 |  |  |  | 1,014 |  |  | $ |  | 3.26 |

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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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