| **Stock-Based Compensation (Schedule Of Stock-Based Compensation Expense By Statement Of Operations) (Details) (USD $)In Millions, unless otherwise specified** | 3 Months Ended | 9 Months Ended |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]**                                                               |           |           |   |   |
| Stock-based compensation expense                                                                                                                                | $ 40           | $ 39           | $ 111 | $ 122 |
| Cost Of Revenue [Member]                                                                                                                                        |           |           |   |   |
| **Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]**                                                               |           |           |   |   |
| Stock-based compensation expense                                                                                                                                | 0              | 0              | 1 | 1 |
| Research And Development [Member]                                                                                                                               |           |           |   |   |
| **Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]**                                                               |           |           |   |   |
| Stock-based compensation expense                                                                                                                                | 25             | 25             | 68 | 72 |
| Marketing and Sales [Member]                                                                                                                                    |           |           |   |   |
| **Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]**                                                               |           |           |   |   |
| Stock-based compensation expense                                                                                                                                | 7              | 7              | 20 | 23 |
| General And Administrative [Member]                                                                                                                             |           |           |   |   |
| **Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]**                                                               |           |           |   |   |
| Stock-based compensation expense                                                                                                                                | $ 8            | $ 7            | $ 22 | $ 26 |

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| - Definition
Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F
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| X                                                                                                                                                                                                                   |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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