Marketable Securities And Cash Equivalents (Investments In Debt And Equity Securities) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Jun. 30, 2012
Schedule of Available-for-sale Securities [Line Items]
Cost of marketable securities and cash equivalents	$ 1,626	$ 1,210
Unrealized gains on marketable securities and cash equivalents	1	3
Unrealized losses on marketable securities and cash equivalents	(12)	(4)
Fair value of marketable securities and cash equivalents	1,615	1,209
United States Government Obligations [Member] \| Maturity Less Than 1 Year [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	698	562
Fair Value	698	562
United States Government Obligations [Member] \| Maturity 1 To 5 Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	96	87
Unrealized gains on available for sale securities	1	1
Fair Value	97	88
Government-Sponsored Enterprise Obligations [Member] \| Maturity 1 To 5 Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	3
Fair Value	3
Corporate Debt Securities [Member] \| Maturity 1 To 5 Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	8	24
Fair Value	8	24
Other Debt Instruments [Member] \| Maturity Less Than 1 Year [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	671	385
Fair Value	671	385
Other Debt Instruments [Member] \| Maturity 1 To 5 Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	3	4
Fair Value	3	4
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost of trading equity securities	25	24
Cost	122	124
Unrealized gains on available for sale securities		2
Unrealized losses on available for sale securities	(12)	(4)
Fair value of trading equity securities	25	24
Fair Value	$ 110	$ 122

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This element represents the fair value of marketable securities and cash equivalents.

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This item represents the cost of debt 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.

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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Total common and preferred stock (which is not mandatorily redeemable, redeemable at the option of the holder, or in any other way classified as liability) equity securities that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for equity securities formerly categorized as available-for-sale or held-to-maturity which the entity held as of the date it opted to account for such securities at fair value. An enterprise may also categorize such a security as trading without the intent to sell it in the near term assuming the decision to categorize the security as trading occurred at acquisition.

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