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Basis of Presentation and Significant Accounting Policies and Practices (Tables) | 6 Months Ended
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Jun. 30, 2016
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 June 30, |
| 2016 |  |  | 2015 |
| Net |  |  |  |  |  |  |  |  |  | Net |  |  |  |  |  |  |  |
| Income |  |  | Shares |  |  | EPS |  |  | Income |  |  | Shares |  |  | EPS |
Basic EPS: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ |  | 779 |  |  |  |  |  |  |  |  |  |  |  | $ |  | 696 |  |  |  |  |  |  |  |  |  |
Income allocated to RSUs |  |  | (10 | ) |  |  |  |  |  |  |  |  |  |  |  |  | (10 | ) |  |  |  |  |  |  |  |  |
Income allocated to common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
for basic EPS calculation | $ |  | 769 |  |  |  | 1,004 |  |  | $ |  | .77 |  |  | $ |  | 686 |  |  |  | 1,038 |  |  | $ |  | .66 |
Adjustment for dilutive shares: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation plans |  |  |  |  |  |  | 12 |  |  |  |  |  |  |  |  |  |  |  |  |  | 13 |  |  |  |  |  |
Diluted EPS: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ |  | 779 |  |  |  |  |  |  |  |  |  |  |  | $ |  | 696 |  |  |  |  |  |  |  |  |  |
Income allocated to RSUs |  |  | (10 | ) |  |  |  |  |  |  |  |  |  |  |  |  | (10 | ) |  |  |  |  |  |  |  |  |
Income allocated to common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
for diluted EPS calculation | $ |  | 769 |  |  |  | 1,016 |  |  | $ |  | .76 |  |  | $ |  | 686 |  |  |  | 1,051 |  |  | $ |  | .65 |
| For Six Months Ended June 30, |
| 2016 |  |  | 2015 |
| Net |  |  |  |  |  |  |  |  |  | Net |  |  |  |  |  |  |  |
| Income |  |  | Shares |  |  | EPS |  |  | Income |  |  | Shares |  |  | EPS |
Basic EPS: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ |  | 1,447 |  |  |  |  |  |  |  |  |  |  |  | $ |  | 1,352 |  |  |  |  |  |  |  |  |  |
Income allocated to RSUs |  |  | (19 | ) |  |  |  |  |  |  |  |  |  |  |  |  | (19 | ) |  |  |  |  |  |  |  |  |
Income allocated to common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
for basic EPS calculation | $ |  | 1,428 |  |  |  | 1,005 |  |  | $ |  | 1.42 |  |  | $ |  | 1,333 |  |  |  | 1,042 |  |  | $ |  | 1.28 |
Adjustment for dilutive shares: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation plans |  |  |  |  |  |  | 12 |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 |  |  |  |  |  |
Diluted EPS: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ |  | 1,447 |  |  |  |  |  |  |  |  |  |  |  | $ |  | 1,352 |  |  |  |  |  |  |  |  |  |
Income allocated to RSUs |  |  | (19 | ) |  |  |  |  |  |  |  |  |  |  |  |  | (19 | ) |  |  |  |  |  |  |  |  |
Income allocated to common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
for diluted EPS calculation | $ |  | 1,428 |  |  |  | 1,017 |  |  | $ |  | 1.40 |  |  | $ |  | 1,333 |  |  |  | 1,056 |  |  | $ |  | 1.26 |

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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://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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