| **Consolidated Statements of Shareholders' Equity (unaudited) (USD $)In Millions** | Total   | Common Stock | Additional Paid in Capital | Accumulated Other Comprehensive Loss | Treasury Stock at Cost | Retained Earnings |
|------------------------------------------------------------------------------------|---------|--------------|----------------------------|--------------------------------------|------------------------|-------------------|
| Balance at Beginning of Period at Dec. 31, 2011                                    | $ 7,265 | $ 656        | $ 2,497                    | $ (100)                              | $ (638)                | $ 4,850           |
| Net Income                                                                         | 263     | 0            | 0                          | 0                                    | 0                      | 263               |
| Stock-based Compensation                                                           | 16      | 0            | 16                         | 0                                    | 0                      | 0                 |
| Exercise of Stock Options                                                          | 27      | 2            | 25                         | 0                                    | 0                      | 0                 |
| Tax Benefits Related to Exercise of Stock Options                                  | 12      | 0            | 12                         | 0                                    | 0                      | 0                 |
| Dividends                                                                          | (39)    | 0            | 0                          | 0                                    | 0                      | (39)              |
| Changes in Treasury Stock, Net                                                     | (13)    | 0            | 0                          | 0                                    | (13)                   | 0                 |
| Net Change in Pension and Other                                                    | 2       | 1            | (1)                        | 2                                    | 0                      | 0                 |
| Balance at End of Period at Mar. 31, 2012                                          | 7,533   | 659          | 2,549                      | (98)                                 | (651)                  | 5,074             |
| Balance at Beginning of Period at Dec. 31, 2012                                    | 8,258   | 2            | 3,304                      | (113)                                | (648)                  | 5,713             |
| Net Income                                                                         | 261     | 0            | 0                          | 0                                    | 0                      | 261               |
| Stock-based Compensation                                                           | 18      | 0            | 18                         | 0                                    | 0                      | 0                 |
| Exercise of Stock Options                                                          | 22      | 0            | 22                         | 0                                    | 0                      | 0                 |
| Tax Benefits Related to Exercise of Stock Options                                  | 9       | 0            | 9                          | 0                                    | 0                      | 0                 |
| Dividends                                                                          | (44)    | 0            | 0                          | 0                                    | 0                      | (44)              |
| Changes in Treasury Stock, Net                                                     | (14)    | 0            | 0                          | 0                                    | (14)                   | 0                 |
| Net Change in Pension and Other                                                    | 4       | 0            | 0                          | 4                                    | 0                      | 0                 |
| Balance at End of Period at Mar. 31, 2013                                          | $ 8,514 | $ 2          | $ 3,353                    | $ (109)                              | $ (662)                | $ 5,930           |

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Equity impact of common stock cash dividends declared by an entity during the period. This element includes paid and unpaid dividends declared during the period.
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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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Net of tax amount of other comprehensive income (loss) attributable to both parent entity and noncontrolling interest.
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| - Definition
Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.
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Value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of stock value of such awards forfeited. Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.
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| - Definition
Value of stock issued as a result of the exercise of stock options.
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| - Definition
Equity impact of the value of stock bought back by the entity at the exercise price or redemption price.
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Tax benefits realized from the exercise of stock options resulting in reductions in the entity's income taxes, which increases net cash provided by operating activities.
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