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Earnings Per Share (EPS) and Dividends (Tables) | 9 Months Ended
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Sep. 30, 2017
Earnings Per Share [Abstract] |
Basic And Diluted Earnings Per Share Computation | The following table shows the effect of these stock options, performance units and restricted stock units on the weighted average number of shares outstanding used in calculating diluted EPS:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30, |
|  | 2017 |  | 2016 |  | 2017 |  | 2016 |
|  | Basic |  | Diluted |  | Basic |  | Diluted |  | Basic |  | Diluted |  | Basic |  | Diluted |
| EPS Numerator (Millions): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Net Income | $ | 395 |  |  | $ | 395 |  |  | $ | 327 |  |  | $ | 327 |  |  | $ | 618 |  |  | $ | 618 |  |  | $ | 985 |  |  | $ | 985 |  |
| EPS Denominator (Millions): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Weighted Average Common Shares Outstanding | 505 |  |  | 505 |  |  | 505 |  |  | 505 |  |  | 505 |  |  | 505 |  |  | 505 |  |  | 505 |  |
| Effect of Stock Based Compensation Awards | — |  |  | 2 |  |  | — |  |  | 3 |  |  | — |  |  | 2 |  |  | — |  |  | 3 |  |
| Total Shares | 505 |  |  | 507 |  |  | 505 |  |  | 508 |  |  | 505 |  |  | 507 |  |  | 505 |  |  | 508 |  |
| EPS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Net Income | $ | 0.78 |  |  | $ | 0.78 |  |  | $ | 0.65 |  |  | $ | 0.64 |  |  | $ | 1.22 |  |  | $ | 1.22 |  |  | $ | 1.95 |  |  | $ | 1.94 |  |
There were approximately 0.3 million for the three months and nine months ended September 30, 2017 and approximately 0.4 million for the three months and nine months ended September 30, 2016 of stock options excluded from the weighted average common shares used for diluted EPS due to their antidilutive effect.
Dividend Payments On Common Stock | Dividends
|  | Three Months Ended |  | Nine Months Ended |
|  | September 30, |  | September 30, |
| Dividend Payments on Common Stock | 2017 |  | 2016 |  | 2017 |  | 2016 |
| Per Share | $ | 0.43 |  |  | $ | 0.41 |  |  | $ | 1.29 |  |  | $ | 1.23 |  |
| In Millions | $ | 217 |  |  | $ | 207 |  |  | $ | 652 |  |  | $ | 622 |  |

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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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