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Earnings Per Share (EPS) and Dividends (Tables) | 3 Months Ended
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Mar. 31, 2015
Text Block [Abstract] |
Basic And Diluted Earnings Per Share Computation |
|  | Three Months Ended March 31, |
|  | 2015 |  | 2014 |
|  | Basic |  | Diluted |  | Basic |  | Diluted |
| EPS Numerator (Millions) |  |  |  |  |  |  |  |
| Net Income | $ | 586 |  |  | $ | 586 |  |  | $ | 386 |  |  | $ | 386 |  |
| EPS Denominator (Millions) |  |  |  |  |  |  |  |
| Weighted Average Common Shares Outstanding | 506 |  |  | 506 |  |  | 506 |  |  | 506 |  |
| Effect of Stock Based Compensation Awards | — |  |  | 2 |  |  | — |  |  | 2 |  |
| Total Shares | 506 |  |  | 508 |  |  | 506 |  |  | 508 |  |
| EPS |  |  |  |  |  |  |  |
| Net Income | $ | 1.16 |  |  | $ | 1.15 |  |  | $ | 0.76 |  |  | $ | 0.76 |  |
Dividend Payments On Common Stock |
|  | Three Months Ended |
|  | March 31, |
| Dividend Payments on Common Stock | 2015 |  | 2014 |
| Per Share | $ | 0.39 |  |  | $ | 0.37 |  |
| In Millions | $ | 197 |  |  | $ | 187 |  |

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