Marketable Securities And Cash Equivalents (Investments In Debt And Equity Securities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Jun. 30, 2012	Jun. 30, 2011
Schedule of Available-for-sale Securities [Line Items]
Cost of marketable securities and cash equivalents	$ 2,340	$ 1,210	$ 1,566
Unrealized gains on marketable securities and cash equivalents	3	3	93
Unrealized losses on marketable securities and cash equivalents	(5)	(4)	(4)
Fair value of marketable securities and cash equivalents	2,338	1,209	1,655
United States Government Obligations [Member] \| Maturity Less Than 1 Year [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	583	562	753
Fair Value	583	562	753
United States Government Obligations [Member] \| Maturity 1 To 5 Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	93	87	72
Unrealized gains on available for sale securities		1	1
Fair Value	93	88	73
Government-Sponsored Enterprise Obligations [Member] \| Maturity Less Than 1 Year [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost			20
Fair Value			20
Government-Sponsored Enterprise Obligations [Member] \| Maturity 1 To 5 Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	2		54
Fair Value	2		54
Government-Sponsored Enterprise Obligations [Member] \| Maturity 5 To 10 Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost			5
Fair Value			5
Government-Sponsored Enterprise Obligations [Member] \| Maturity Greater Than 10 Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost			218
Unrealized gains on available for sale securities			8
Fair Value			226
Corporate Debt Securities [Member] \| Maturity Less Than 1 Year [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost			1
Fair Value			1
Corporate Debt Securities [Member] \| Maturity 1 To 5 Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	15	24	35
Unrealized gains on available for sale securities			1
Fair Value	15	24	36
Other Debt Instruments [Member] \| Maturity Less Than 1 Year [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	1,038	385	215
Fair Value	1,038	385	215
Other Debt Instruments [Member] \| Maturity 1 To 5 Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	3	4	3
Fair Value	3	4	3
Other Debt Instruments [Member] \| Maturity 5 To 10 Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost			7
Fair Value			7
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost of trading equity securities		24	24
Cost	606	124	159
Unrealized gains on available for sale securities	3	2	83
Unrealized losses on available for sale securities	(5)	(4)	(4)
Fair value of trading equity securities		24	24
Fair Value	$ 604	$ 122	$ 238

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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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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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