| **(Fair Value Of Short-Term Investments) (Details) (USD $)In Millions, unless otherwise specified** | 12 Months Ended |
|-----------------------------------------------------------------------------------------------------|-----------------|
||
| **Financial Instruments [Line Items]**                                                              |            |   |
| Fair Value                                                                                          | $ 583           | $ 388 |
| Short-Term Investments [Member]                                                                     |            |   |
| **Financial Instruments [Line Items]**                                                              |            |   |
| Cost or Amortized Cost                                                                              | 583             | 387 |
| Gross Unrealized Gains                                                                              | 0               | 1 |
| Gross Unrealized Losses                                                                             | 0               | 0 |
| Fair Value                                                                                          | 583             | 388 |
| Short-Term Investments [Member] | Corporate Bonds [Member]                                          |            |   |
| **Financial Instruments [Line Items]**                                                              |            |   |
| Cost or Amortized Cost                                                                              | 279             | 177 |
| Gross Unrealized Gains                                                                              | 0               | 1 |
| Gross Unrealized Losses                                                                             | 0               | 0 |
| Fair Value                                                                                          | 279             | 178 |
| Short-Term Investments [Member] | U.S. Treasury Securities [Member]                                 |            |   |
| **Financial Instruments [Line Items]**                                                              |            |   |
| Cost or Amortized Cost                                                                              | 114             | 85 |
| Gross Unrealized Gains                                                                              | 0               | 0 |
| Gross Unrealized Losses                                                                             | 0               | 0 |
| Fair Value                                                                                          | 114             | 85 |
| Short-Term Investments [Member] | U.S. Agency Securities [Member]                                   |            |   |
| **Financial Instruments [Line Items]**                                                              |            |   |
| Cost or Amortized Cost                                                                              | 80              | 76 |
| Gross Unrealized Gains                                                                              | 0               | 0 |
| Gross Unrealized Losses                                                                             | 0               | 0 |
| Fair Value                                                                                          | 80              | 76 |
| Short-Term Investments [Member] | Commercial Paper [Member]                                         |            |   |
| **Financial Instruments [Line Items]**                                                              |            |   |
| Cost or Amortized Cost                                                                              | 110             | 49 |
| Gross Unrealized Gains                                                                              | 0               | 0 |
| Gross Unrealized Losses                                                                             | 0               | 0 |
| Fair Value                                                                                          | $ 110           | $ 49 |

| X                                                                                                                                                       |
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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
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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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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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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