| **Financial Instruments (Fair Value Of Short-Term Investments) (Details) (USD $)In Millions, unless otherwise specified** | 9 Months Ended | 12 Months Ended |
|---------------------------------------------------------------------------------------------------------------------------|----------------|-----------------|
||
| **Financial Instruments**                                                                                                 |           |            |  |
| Fair Value                                                                                                                | $ 324          | $ 388           | [1] |
| Short-Term Investments                                                                                                    |           |            |  |
| **Financial Instruments**                                                                                                 |           |            |  |
| Cost or Amortized Cost                                                                                                    | 324            | 387             |  |
| Gross Unrealized Gains                                                                                                    | 0              | 1               |  |
| Gross Unrealized Losses                                                                                                   | 0              | 0               |  |
| Fair Value                                                                                                                | 324            | 388             |  |
| Short-Term Investments | Corporate bonds                                                                                  |           |            |  |
| **Financial Instruments**                                                                                                 |           |            |  |
| Cost or Amortized Cost                                                                                                    | 168            | 177             |  |
| Gross Unrealized Gains                                                                                                    | 0              | 1               |  |
| Gross Unrealized Losses                                                                                                   | 0              | 0               |  |
| Fair Value                                                                                                                | 168            | 178             |  |
| Short-Term Investments | U.S. agency securities                                                                           |           |            |  |
| **Financial Instruments**                                                                                                 |           |            |  |
| Cost or Amortized Cost                                                                                                    | 51             | 76              |  |
| Gross Unrealized Gains                                                                                                    | 0              | 0               |  |
| Gross Unrealized Losses                                                                                                   | 0              | 0               |  |
| Fair Value                                                                                                                | 51             | 76              |  |
| Short-Term Investments | U.S. Treasury securities                                                                         |           |            |  |
| **Financial Instruments**                                                                                                 |           |            |  |
| Cost or Amortized Cost                                                                                                    | 64             | 85              |  |
| Gross Unrealized Gains                                                                                                    | 0              | 0               |  |
| Gross Unrealized Losses                                                                                                   | 0              | 0               |  |
| Fair Value                                                                                                                | 64             | 85              |  |
| Short-Term Investments | Commercial paper                                                                                 |           |            |  |
| **Financial Instruments**                                                                                                 |           |            |  |
| Cost or Amortized Cost                                                                                                    | 41             | 49              |  |
| Gross Unrealized Gains                                                                                                    | 0              | 0               |  |
| Gross Unrealized Losses                                                                                                   | 0              | 0               |  |
| Fair Value                                                                                                                | $ 41           | $ 49            |  |
|                                                                                                                           |
| [1]Derived from audited consolidated financial statements.                                                                |

| X                                                                                                                                                       |
|---------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562
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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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