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Marketable Securities And Cash Equivalents (Details) (USD $) In Millions | Sep. 30, 2011 | Jun. 30, 2011
--- | --- | ---
Cost of marketable securities and cash equivalents | $ 1,728 | $ 1,566
Cost of trading equity securities | 22 | 24
Unrealized gains on marketable securities and cash equivalents | 31 | 93
Unrealized losses on marketable securities and cash equivalents | (35) | (4)
Unrealized gains on trading equity securities |  |
Unrealized losses on trading equity securities |  |
Fair value of marketable securities and cash equivalents | 1,724 | 1,655
Fair value of trading equity securities | 22 | 24
United States Government Obligations [Member] | Maturity Less Than 1 Year [Member] |  |
Cost | 468 | 753
Unrealized Gains on available for sale equity securities |  |
Unrealized losses on available for sale equity securities |  |
Fair Value | 468 | 753
United States Government Obligations [Member] | Maturity 1 To 5 Years [Member] |  |
Cost | 61 | 72
Unrealized Gains on available for sale equity securities | 1 | 1
Unrealized losses on available for sale equity securities |  |
Fair Value | 62 | 73
Government-Sponsored Enterprise Obligations [Member] | Maturity Less Than 1 Year [Member] |  |
Cost |  | 20
Unrealized Gains on available for sale equity securities |  |
Unrealized losses on available for sale equity securities |  |
Fair Value |  | 20
Government-Sponsored Enterprise Obligations [Member] | Maturity 1 To 5 Years [Member] |  |
Cost |  | 54
Unrealized Gains on available for sale equity securities |  |
Unrealized losses on available for sale equity securities |  |
Fair Value |  | 54
Government-Sponsored Enterprise Obligations [Member] | Maturity 5 To 10 Years [Member] |  |
Cost |  | 5
Unrealized Gains on available for sale equity securities |  |
Unrealized losses on available for sale equity securities |  |
Fair Value |  | 5
Government-Sponsored Enterprise Obligations [Member] | Maturity Greater Than 10 Years [Member] |  |
Cost |  | 218
Unrealized Gains on available for sale equity securities |  | 8
Unrealized losses on available for sale equity securities |  |
Fair Value |  | 226
Corporate Debt Securities [Member] |  |
Unrealized losses on available for sale equity securities | (1) |
Corporate Debt Securities [Member] | Maturity Less Than 1 Year [Member] |  |
Cost |  | 1
Unrealized Gains on available for sale equity securities |  |
Unrealized losses on available for sale equity securities |  |
Fair Value |  | 1
Corporate Debt Securities [Member] | Maturity 1 To 5 Years [Member] |  |
Cost | 66 | 35
Unrealized Gains on available for sale equity securities |  | 1
Unrealized losses on available for sale equity securities | (1) |
Fair Value | 65 | 36
Other Debt Instruments [Member] | Maturity Less Than 1 Year [Member] |  |
Cost | 950 | 215
Unrealized Gains on available for sale equity securities |  |
Unrealized losses on available for sale equity securities |  |
Fair Value | 950 | 215
Other Debt Instruments [Member] | Maturity 1 To 5 Years [Member] |  |
Cost | 4 | 3
Unrealized Gains on available for sale equity securities |  |
Unrealized losses on available for sale equity securities |  |
Fair Value | 4 | 3
Other Debt Instruments [Member] | Maturity 5 To 10 Years [Member] |  |
Cost |  | 7
Unrealized Gains on available for sale equity securities |  |
Unrealized losses on available for sale equity securities |  |
Fair Value |  | 7
Equity Securities [Member] |  |
Cost | 157 | 159
Unrealized Gains on available for sale equity securities | 30 | 83
Unrealized losses on available for sale equity securities | (34) | (4)
Fair Value | $ 153 | $ 238

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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6379932&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 29 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),1(b)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Implementation Guide (Q and A) -Number FAS115 -Paragraph 35 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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