| **(Fair Value Of Short-Term Investments) (Details) - USD ($) $ in Millions** | 12 Months Ended |
|------------------------------------------------------------------------------|-----------------|
||
| **Financial Instruments [Line Items]**                                       |            |   |
| Fair Value                                                                   | $ 1,341         | $ 953 |
| Short-Term Investments [Member]                                              |            |   |
| **Financial Instruments [Line Items]**                                       |            |   |
| Cost or Amortized Cost                                                       | 1,339           | 952 |
| Gross Unrealized Gains                                                       | 2               | 1 |
| Gross Unrealized Losses                                                      | 0               | 0 |
| Fair Value                                                                   | 1,341           | 953 |
| Short-Term Investments [Member] | Corporate Bonds [Member]                   |            |   |
| **Financial Instruments [Line Items]**                                       |            |   |
| Cost or Amortized Cost                                                       | 733             | 467 |
| Gross Unrealized Gains                                                       | 1               | 0 |
| Gross Unrealized Losses                                                      | 0               | 0 |
| Fair Value                                                                   | 734             | 467 |
| Short-Term Investments [Member] | U.S. Treasury Securities [Member]          |            |   |
| **Financial Instruments [Line Items]**                                       |            |   |
| Cost or Amortized Cost                                                       | 389             | 214 |
| Gross Unrealized Gains                                                       | 1               | 0 |
| Gross Unrealized Losses                                                      | 0               |   |
| Fair Value                                                                   | 390             | 214 |
| Short-Term Investments [Member] | U.S. Agency Securities [Member]            |            |   |
| **Financial Instruments [Line Items]**                                       |            |   |
| Cost or Amortized Cost                                                       | 167             | 161 |
| Gross Unrealized Gains                                                       | 0               | 1 |
| Gross Unrealized Losses                                                      | 0               | 0 |
| Fair Value                                                                   | 167             | 162 |
| Short-Term Investments [Member] | Commercial Paper [Member]                  |            |   |
| **Financial Instruments [Line Items]**                                       |            |   |
| Cost or Amortized Cost                                                       | 50              | 110 |
| Gross Unrealized Gains                                                       | 0               | 0 |
| Gross Unrealized Losses                                                      | 0               | 0 |
| Fair Value                                                                   | $ 50            | $ 110 |

| X                                                                                                                                                                                                                                             |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Financial Instruments [Line Items]
+ References
No definition available.
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| - Definition
This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.
+ References
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| - Definition
Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.
+ References
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| X                                                                                                                                                     |
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