| **Financial Instruments (Fair Value Of Short-Term Investments) (Details) - USD ($) $ in Millions** | 9 Months Ended | 12 Months Ended |
|----------------------------------------------------------------------------------------------------|----------------|-----------------|
||
| **Financial Instruments**                                                                          |           |            |  |
| Fair Value                                                                                         | $ 966          | $ 953           | [1] |
| Short-Term Investments                                                                             |           |            |  |
| **Financial Instruments**                                                                          |           |            |  |
| Cost or Amortized Cost                                                                             | 968            | 952             |  |
| Gross Unrealized Gains                                                                             | 0              | 1               |  |
| Gross Unrealized Losses                                                                            | (2)            | 0               |  |
| Fair Value                                                                                         | 966            | 953             |  |
| Short-Term Investments | Corporate bonds                                                           |           |            |  |
| **Financial Instruments**                                                                          |           |            |  |
| Cost or Amortized Cost                                                                             | 579            | 467             |  |
| Gross Unrealized Gains                                                                             | 0              | 0               |  |
| Gross Unrealized Losses                                                                            | (1)            | 0               |  |
| Fair Value                                                                                         | 578            | 467             |  |
| Short-Term Investments | U.S. Treasury securities                                                  |           |            |  |
| **Financial Instruments**                                                                          |           |            |  |
| Cost or Amortized Cost                                                                             | 196            | 214             |  |
| Gross Unrealized Gains                                                                             | 0              | 0               |  |
| Gross Unrealized Losses                                                                            | (1)            | 0               |  |
| Fair Value                                                                                         | 195            | 214             |  |
| Short-Term Investments | U.S. agency securities                                                    |           |            |  |
| **Financial Instruments**                                                                          |           |            |  |
| Cost or Amortized Cost                                                                             | 154            | 161             |  |
| Gross Unrealized Gains                                                                             | 0              | 1               |  |
| Gross Unrealized Losses                                                                            | 0              | 0               |  |
| Fair Value                                                                                         | 154            | 162             |  |
| Short-Term Investments | Commercial paper                                                          |           |            |  |
| **Financial Instruments**                                                                          |           |            |  |
| Cost or Amortized Cost                                                                             | 39             | 110             |  |
| Gross Unrealized Gains                                                                             | 0              | 0               |  |
| Gross Unrealized Losses                                                                            | 0              | 0               |  |
| Fair Value                                                                                         | $ 39           | $ 110           |  |
|                                                                                                    |
| [1]Derived from audited Consolidated Financial Statements.                                         |

| X                                                                                                                                                                                                                                             |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Financial Instruments [Line Items]
+ References
No definition available.
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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
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
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=51813488&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=49167202&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
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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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| X                                                                                                                                                                             |
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