| **(Fair Value Of Short-Term Investments) (Details) - USD ($) $ in Millions**  | 12 Months Ended |
|-------------------------------------------------------------------------------|-----------------|
||
| **Financial Instruments [Line Items]**                                        |            |   |
| Fair Value                                                                    | $ 1,073         | $ 1,967 |
| Short-Term Investments [Member]                                               |            |   |
| **Financial Instruments [Line Items]**                                        |            |   |
| Cost or Amortized Cost                                                        | 1,082           | 1,970 |
| Gross Unrealized Gains                                                        |            | 0 |
| Gross Unrealized Losses                                                       | (9)             | (3) |
| Fair Value                                                                    | 1,073           | 1,967 |
| Short-Term Investments [Member] | Corporate Bonds [Member]                    |            |   |
| **Financial Instruments [Line Items]**                                        |            |   |
| Cost or Amortized Cost                                                        | 629             | 944 |
| Gross Unrealized Gains                                                        | 0               | 0 |
| Gross Unrealized Losses                                                       | (5)             | (1) |
| Fair Value                                                                    | 624             | 943 |
| Short-Term Investments [Member] | U.S. Treasury Securities [Member]           |            |   |
| **Financial Instruments [Line Items]**                                        |            |   |
| Cost or Amortized Cost                                                        | 212             | 414 |
| Gross Unrealized Gains                                                        | 0               | 0 |
| Gross Unrealized Losses                                                       | (2)             | (1) |
| Fair Value                                                                    | 210             | 413 |
| Short-Term Investments [Member] | U.S. Agency Securities [Member]             |            |   |
| **Financial Instruments [Line Items]**                                        |            |   |
| Cost or Amortized Cost                                                        | 79              | 152 |
| Gross Unrealized Gains                                                        | 0               | 0 |
| Gross Unrealized Losses                                                       | (1)             | (1) |
| Fair Value                                                                    | 78              | 151 |
| Short-Term Investments [Member] | Commercial Paper [Member]                   |            |   |
| **Financial Instruments [Line Items]**                                        |            |   |
| Cost or Amortized Cost                                                        | 109             | 212 |
| Gross Unrealized Gains                                                        | 0               | 0 |
| Gross Unrealized Losses                                                       | 0               | 0 |
| Fair Value                                                                    | 109             | 212 |
| Short-Term Investments [Member] | Foreign Government Debt Securities [Member] |            |   |
| **Financial Instruments [Line Items]**                                        |            |   |
| Cost or Amortized Cost                                                        | 53              | 113 |
| Gross Unrealized Gains                                                        | 0               | 0 |
| Gross Unrealized Losses                                                       | (1)             | 0 |
| Fair Value                                                                    | 52              | 113 |
| Short-Term Investments [Member] | Asset-backed Securities [Member]            |            |   |
| **Financial Instruments [Line Items]**                                        |            |   |
| Cost or Amortized Cost                                                        | 0               | 135 |
| Gross Unrealized Gains                                                        | 0               | 0 |
| Gross Unrealized Losses                                                       | 0               | 0 |
| Fair Value                                                                    | $ 0             | $ 135 |

| X                                                                                                                                                                                                                                             |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Financial Instruments [Line Items]
+ References
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+ 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.
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