| **Intangible Assets - Schedule of Intangible Assets by Type (Details) - USD ($) $ in Millions** | Sep. 30, 2015 | Dec. 31, 2014 |
|-------------------------------------------------------------------------------------------------|---------------|---------------|
| **Schedule of Finite-Lived and Indefinite-Lived Intangible Assets by Major Class [Line Items]** |          |          |
| Finite-Lived Intangible Assets, Gross                                                           | $ 1,496       | $ 1,501       |
| Finite-Lived Intangible Assets, Accumulated Amortization                                        | 767           | 689           |
| Finite-Lived Intangible Assets, Net                                                             | 729           | 812           |
| Technology-Based Intangible Assets                                                              |          |          |
| **Schedule of Finite-Lived and Indefinite-Lived Intangible Assets by Major Class [Line Items]** |          |          |
| Finite-Lived Intangible Assets, Gross                                                           | 872           | 870           |
| Finite-Lived Intangible Assets, Accumulated Amortization                                        | 438           | 393           |
| Finite-Lived Intangible Assets, Net                                                             | 434           | 477           |
| Customer Relationships                                                                          |          |          |
| **Schedule of Finite-Lived and Indefinite-Lived Intangible Assets by Major Class [Line Items]** |          |          |
| Finite-Lived Intangible Assets, Gross                                                           | 487           | 488           |
| Finite-Lived Intangible Assets, Accumulated Amortization                                        | 221           | 191           |
| Finite-Lived Intangible Assets, Net                                                             | 266           | 297           |
| Trade Names                                                                                     |          |          |
| **Schedule of Finite-Lived and Indefinite-Lived Intangible Assets by Major Class [Line Items]** |          |          |
| Finite-Lived Intangible Assets, Gross                                                           | 119           | 120           |
| Finite-Lived Intangible Assets, Accumulated Amortization                                        | 95            | 92            |
| Finite-Lived Intangible Assets, Net                                                             | 24            | 28            |
| Other Intangible Assets                                                                         |          |          |
| **Schedule of Finite-Lived and Indefinite-Lived Intangible Assets by Major Class [Line Items]** |          |          |
| Finite-Lived Intangible Assets, Gross                                                           | 18            | 23            |
| Finite-Lived Intangible Assets, Accumulated Amortization                                        | 13            | 13            |
| Finite-Lived Intangible Assets, Net                                                             | $ 5           | $ 10          |

| X                                                                                                                                                                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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Schedule of Finite-Lived and Indefinite-Lived Intangible Assets by Major Class
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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.
+ References
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| - Definition
Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.
+ References
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