Fair Value Measurements (Net Carrying Value And Estimated Fair Value Of Available-For-Sale Marketable Securities) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013
Due in one year or less, Cost	$ 816
Due in one year or less, Estimated Fair Value	816
Due after one year through three years, Cost	2,864
Due after one year through three years, Estimated Fair Value	2,865
Due after three years, Cost	347
Due after three years, Estimated Fair Value	347
Fair value of available-for-sale marketable securities, Cost	4,027
Fair value of available-for-sale marketable securities, Estimated Fair Value	$ 4,028

Available for sale Securities, Debt Maturities, After One Through Three Years, Amortized Cost

No definition available.

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- Definition

This item represents the fair value of debt securities which are expected to mature after one through three years of the balance sheet date and which are categorized neither as held-to-maturity nor trading securities.

+ References

No definition available.

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- Definition

Available for sale Securities, Debt Maturities, After Three Years, Amortized Cost

+ References

No definition available.

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- Definition

This item represents the fair value of debt securities which are expected to mature after three years of the balance sheet date and which are categorized neither as held-to-maturity nor trading securities.

+ References

No definition available.

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- Definition

Amount of available-for-sale debt securities at cost, net of adjustments, which include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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-Subparagraph (SX 210.5-02.2)

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- Definition

Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

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- Definition

Amount of available-for-sale debt securities at fair value maturing in the next fiscal year following the latest fiscal year.

+ References

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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