Marketable Securities and Cash Equivalents (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Jun. 30, 2011 years acquisitions securities days segments VIEs	Jun. 30, 2010
Schedule of Available-for-sale Securities.
Cost of marketable securities and cash equivalents	$ 1,566	$ 1,690
Cost of trading equity securities	24	20
Unrealized gains on marketable securities and cash equivalents	93	67
Unrealized losses on marketable securities and cash equivalents	(4)	(15)
Fair value of marketable securities and cash equivalents	1,655	1,742
Fair value of trading equity securities	24	20
Available-for-sale securities
Unrealized losses that arose within the last 12 months	4
Market value of the investments that have been in an unrealized loss position for less than 12 months	9
Number of available-for-sale equity securities with unrealized losses (in securities)	1
United States government obligations \| Maturity less than 1 year
Schedule of Available-for-sale Securities.
Cost	753	395
Fair Value	753	395
United States government obligations \| Maturity 1 to 5 years
Schedule of Available-for-sale Securities.
Cost	72	33
Unrealized Gains	1	1
Fair Value	73	34
Government-sponsored enterprise obligations \| Maturity less than 1 year
Schedule of Available-for-sale Securities.
Cost	20
Fair Value	20
Government-sponsored enterprise obligations \| Maturity 1 to 5 years
Schedule of Available-for-sale Securities.
Cost	54	111
Unrealized Gains		3
Fair Value	54	114
Government-sponsored enterprise obligations \| Maturity 5 to 10 years
Schedule of Available-for-sale Securities.
Cost	5	122
Unrealized Gains		4
Fair Value	5	126
Government-sponsored enterprise obligations \| Maturity greater than 10 years
Schedule of Available-for-sale Securities.
Cost	218	232
Unrealized Gains	8	9
Fair Value	226	241
Corporate debt securities \| Maturity less than 1 year
Schedule of Available-for-sale Securities.
Cost	1	10
Fair Value	1	10
Corporate debt securities \| Maturity 1 to 5 years
Schedule of Available-for-sale Securities.
Cost	35	46
Unrealized Gains	1	2
Fair Value	36	48
Debt instruments - Other \| Maturity less than 1 year
Schedule of Available-for-sale Securities.
Cost	215	659
Fair Value	215	659
Debt instruments - Other \| Maturity 1 to 5 years
Schedule of Available-for-sale Securities.
Cost	3	2
Fair Value	3	2
Debt instruments - Other \| Maturity 5 to 10 years
Schedule of Available-for-sale Securities.
Cost	7	6
Fair Value	7	6
Equity securities
Schedule of Available-for-sale Securities.
Cost	159	54
Unrealized Gains	83	48
Unrealized Losses	(4)	(15)
Fair Value	$ 238	$ 87

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This item represents the excess of amortized cost basis over fair value of securities that have been in a loss position for less than twelve months for those securities which are categorized neither as held-to-maturity nor trading securities.

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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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