| **Financial Instruments (Fair Value Of Short-Term Investments) (Details) (USD $)In Millions, unless otherwise specified** | 9 Months Ended                                                                                                                                                                                                             | 12 Months Ended                                                                                                                                                                                                            |
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| **Financial Instruments**                                                                                                 |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |  |
| Fair Value                                                                                                                | $ 774us-gaap_AvailableForSaleSecuritiesCurrent                                                                                                                                                                             | $ 583us-gaap_AvailableForSaleSecuritiesCurrent                                                                                                                                                                             | [1] |
| Short-Term Investments                                                                                                    |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |  |
| **Financial Instruments**                                                                                                 |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |  |
| Cost or Amortized Cost                                                                                                    | 775us-gaap_AvailableForSaleSecuritiesAmortizedCost/ us-gaap_InvestmentTypeAxis= us-gaap_ShortTermInvestmentsMember                                                                                                         | 583us-gaap_AvailableForSaleSecuritiesAmortizedCost/ us-gaap_InvestmentTypeAxis= us-gaap_ShortTermInvestmentsMember                                                                                                         |  |
| Gross Unrealized Gains                                                                                                    | 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains/ us-gaap_InvestmentTypeAxis= us-gaap_ShortTermInvestmentsMember                                                                                                    | 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains/ us-gaap_InvestmentTypeAxis= us-gaap_ShortTermInvestmentsMember                                                                                                    |  |
| Gross Unrealized Losses                                                                                                   | (1)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss/ us-gaap_InvestmentTypeAxis= us-gaap_ShortTermInvestmentsMember                                                                                                   | 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss/ us-gaap_InvestmentTypeAxis= us-gaap_ShortTermInvestmentsMember                                                                                                     |  |
| Fair Value                                                                                                                | 774us-gaap_AvailableForSaleSecuritiesCurrent/ us-gaap_InvestmentTypeAxis= us-gaap_ShortTermInvestmentsMember                                                                                                               | 583us-gaap_AvailableForSaleSecuritiesCurrent/ us-gaap_InvestmentTypeAxis= us-gaap_ShortTermInvestmentsMember                                                                                                               |  |
| Short-Term Investments | Corporate bonds                                                                                  |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |  |
| **Financial Instruments**                                                                                                 |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |  |
| Cost or Amortized Cost                                                                                                    | 399us-gaap_AvailableForSaleSecuritiesAmortizedCost/ us-gaap_InvestmentTypeAxis= us-gaap_ShortTermInvestmentsMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_CorporateDebtSecuritiesMember                 | 279us-gaap_AvailableForSaleSecuritiesAmortizedCost/ us-gaap_InvestmentTypeAxis= us-gaap_ShortTermInvestmentsMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_CorporateDebtSecuritiesMember                 |  |
| Gross Unrealized Gains                                                                                                    | 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains/ us-gaap_InvestmentTypeAxis= us-gaap_ShortTermInvestmentsMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_CorporateDebtSecuritiesMember            | 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains/ us-gaap_InvestmentTypeAxis= us-gaap_ShortTermInvestmentsMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_CorporateDebtSecuritiesMember            |  |
| Gross Unrealized Losses                                                                                                   | (1)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss/ us-gaap_InvestmentTypeAxis= us-gaap_ShortTermInvestmentsMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_CorporateDebtSecuritiesMember           | 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss/ us-gaap_InvestmentTypeAxis= us-gaap_ShortTermInvestmentsMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_CorporateDebtSecuritiesMember             |  |
| Fair Value                                                                                                                | 398us-gaap_AvailableForSaleSecuritiesCurrent/ us-gaap_InvestmentTypeAxis= us-gaap_ShortTermInvestmentsMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_CorporateDebtSecuritiesMember                       | 279us-gaap_AvailableForSaleSecuritiesCurrent/ us-gaap_InvestmentTypeAxis= us-gaap_ShortTermInvestmentsMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_CorporateDebtSecuritiesMember                       |  |
| Short-Term Investments | U.S. Treasury securities                                                                         |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |  |
| **Financial Instruments**                                                                                                 |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |  |
| Cost or Amortized Cost                                                                                                    | 168us-gaap_AvailableForSaleSecuritiesAmortizedCost/ us-gaap_InvestmentTypeAxis= us-gaap_ShortTermInvestmentsMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_USTreasurySecuritiesMember                    | 114us-gaap_AvailableForSaleSecuritiesAmortizedCost/ us-gaap_InvestmentTypeAxis= us-gaap_ShortTermInvestmentsMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_USTreasurySecuritiesMember                    |  |
| Gross Unrealized Gains                                                                                                    | 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains/ us-gaap_InvestmentTypeAxis= us-gaap_ShortTermInvestmentsMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_USTreasurySecuritiesMember               | 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains/ us-gaap_InvestmentTypeAxis= us-gaap_ShortTermInvestmentsMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_USTreasurySecuritiesMember               |  |
| Gross Unrealized Losses                                                                                                   | 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss/ us-gaap_InvestmentTypeAxis= us-gaap_ShortTermInvestmentsMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_USTreasurySecuritiesMember                | 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss/ us-gaap_InvestmentTypeAxis= us-gaap_ShortTermInvestmentsMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_USTreasurySecuritiesMember                |  |
| Fair Value                                                                                                                | 168us-gaap_AvailableForSaleSecuritiesCurrent/ us-gaap_InvestmentTypeAxis= us-gaap_ShortTermInvestmentsMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_USTreasurySecuritiesMember                          | 114us-gaap_AvailableForSaleSecuritiesCurrent/ us-gaap_InvestmentTypeAxis= us-gaap_ShortTermInvestmentsMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_USTreasurySecuritiesMember                          |  |
| Short-Term Investments | U.S. agency securities                                                                           |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |  |
| **Financial Instruments**                                                                                                 |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |  |
| Cost or Amortized Cost                                                                                                    | 126us-gaap_AvailableForSaleSecuritiesAmortizedCost/ us-gaap_InvestmentTypeAxis= us-gaap_ShortTermInvestmentsMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_USGovernmentAgenciesDebtSecuritiesMember      | 80us-gaap_AvailableForSaleSecuritiesAmortizedCost/ us-gaap_InvestmentTypeAxis= us-gaap_ShortTermInvestmentsMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_USGovernmentAgenciesDebtSecuritiesMember       |  |
| Gross Unrealized Gains                                                                                                    | 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains/ us-gaap_InvestmentTypeAxis= us-gaap_ShortTermInvestmentsMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_USGovernmentAgenciesDebtSecuritiesMember | 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains/ us-gaap_InvestmentTypeAxis= us-gaap_ShortTermInvestmentsMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_USGovernmentAgenciesDebtSecuritiesMember |  |
| Gross Unrealized Losses                                                                                                   | 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss/ us-gaap_InvestmentTypeAxis= us-gaap_ShortTermInvestmentsMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_USGovernmentAgenciesDebtSecuritiesMember  | 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss/ us-gaap_InvestmentTypeAxis= us-gaap_ShortTermInvestmentsMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_USGovernmentAgenciesDebtSecuritiesMember  |  |
| Fair Value                                                                                                                | 126us-gaap_AvailableForSaleSecuritiesCurrent/ us-gaap_InvestmentTypeAxis= us-gaap_ShortTermInvestmentsMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_USGovernmentAgenciesDebtSecuritiesMember            | 80us-gaap_AvailableForSaleSecuritiesCurrent/ us-gaap_InvestmentTypeAxis= us-gaap_ShortTermInvestmentsMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_USGovernmentAgenciesDebtSecuritiesMember             |  |
| Short-Term Investments | Commercial paper                                                                                 |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |  |
| **Financial Instruments**                                                                                                 |                                                                                                                                                                                                                       |                                                                                                                                                                                                                       |  |
| Cost or Amortized Cost                                                                                                    | 82us-gaap_AvailableForSaleSecuritiesAmortizedCost/ us-gaap_InvestmentTypeAxis= us-gaap_ShortTermInvestmentsMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_CommercialPaperMember                          | 110us-gaap_AvailableForSaleSecuritiesAmortizedCost/ us-gaap_InvestmentTypeAxis= us-gaap_ShortTermInvestmentsMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_CommercialPaperMember                         |  |
| Gross Unrealized Gains                                                                                                    | 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains/ us-gaap_InvestmentTypeAxis= us-gaap_ShortTermInvestmentsMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_CommercialPaperMember                    | 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains/ us-gaap_InvestmentTypeAxis= us-gaap_ShortTermInvestmentsMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_CommercialPaperMember                    |  |
| Gross Unrealized Losses                                                                                                   | 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss/ us-gaap_InvestmentTypeAxis= us-gaap_ShortTermInvestmentsMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_CommercialPaperMember                     | 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss/ us-gaap_InvestmentTypeAxis= us-gaap_ShortTermInvestmentsMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_CommercialPaperMember                     |  |
| Fair Value                                                                                                                | $ 82us-gaap_AvailableForSaleSecuritiesCurrent/ us-gaap_InvestmentTypeAxis= us-gaap_ShortTermInvestmentsMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_CommercialPaperMember                              | $ 110us-gaap_AvailableForSaleSecuritiesCurrent/ us-gaap_InvestmentTypeAxis= us-gaap_ShortTermInvestmentsMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_CommercialPaperMember                             |  |
|                                                                                                                           |
| [1]Derived from audited consolidated financial statements.                                                                |

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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
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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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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
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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=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
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
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563
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