Marketable Securities And Cash Equivalents (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Jun. 30, 2011
Cost of marketable securities and cash equivalents	$ 1,302	$ 1,566
Unrealized gains on marketable securities and cash equivalents	26	93
Unrealized losses on marketable securities and cash equivalents	(3)	(4)
Fair value of marketable securities and cash equivalents	1,325	1,655
United States Government Obligations [Member] \| Maturity Less Than 1 Year [Member]
Cost	541	753
Unrealized Gains on available for sale securities
Unrealized losses on available for sale securities
Fair Value	541	753
United States Government Obligations [Member] \| Maturity 1 To 5 Years [Member]
Cost	103	72
Unrealized Gains on available for sale securities		1
Unrealized losses on available for sale securities
Fair Value	103	73
Government-Sponsored Enterprise Obligations [Member] \| Maturity Less Than 1 Year [Member]
Cost		20
Unrealized Gains on available for sale securities
Unrealized losses on available for sale securities
Fair Value		20
Government-Sponsored Enterprise Obligations [Member] \| Maturity 1 To 5 Years [Member]
Cost	2	54
Unrealized Gains on available for sale securities
Unrealized losses on available for sale securities
Fair Value	2	54
Government-Sponsored Enterprise Obligations [Member] \| Maturity 5 To 10 Years [Member]
Cost		5
Unrealized Gains on available for sale securities
Unrealized losses on available for sale securities
Fair Value		5
Government-Sponsored Enterprise Obligations [Member] \| Maturity Greater Than 10 Years [Member]
Cost		218
Unrealized Gains on available for sale securities		8
Unrealized losses on available for sale securities
Fair Value		226
Corporate Debt Securities [Member] \| Maturity Less Than 1 Year [Member]
Cost		1
Unrealized Gains on available for sale securities
Unrealized losses on available for sale securities
Fair Value		1
Corporate Debt Securities [Member] \| Maturity 1 To 5 Years [Member]
Cost	60	35
Unrealized Gains on available for sale securities		1
Unrealized losses on available for sale securities
Fair Value	60	36
Other Debt Instruments [Member] \| Maturity Less Than 1 Year [Member]
Cost	432	215
Unrealized Gains on available for sale securities
Unrealized losses on available for sale securities
Fair Value	432	215
Other Debt Instruments [Member] \| Maturity 1 To 5 Years [Member]
Cost	4	3
Unrealized Gains on available for sale securities
Unrealized losses on available for sale securities
Fair Value	4	3
Other Debt Instruments [Member] \| Maturity 5 To 10 Years [Member]
Cost		7
Unrealized Gains on available for sale securities
Unrealized losses on available for sale securities
Fair Value		7
Equity Securities [Member]
Cost of trading equity securities	24	24
Cost	136	159
Unrealized Gains on available for sale securities	26	83
Unrealized losses on available for sale securities	(3)	(4)
Unrealized gains on trading equity securities
Unrealized losses on trading equity securities
Fair value of trading equity securities	24	24
Fair Value	$ 159	$ 238

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No definition available.

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

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This item represents the gross unrealized gains for securities, at a point in time, which are categorized as trading securities.

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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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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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