Marketable Securities And Cash Equivalents (Narrative) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	1 Months Ended
Mar. 31, 2012 security	Dec. 31, 2011 Equity Securities [Member]	Mar. 31, 2012 Equity Securities [Member]	Jun. 30, 2011 Equity Securities [Member]
Other than temporary impairment losses, investments, available-for-sale securities		$ 13
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			30
Unrealized losses on available-for-sale securities			$ 4	$ 4
Number of available-for-sale equity securities with unrealized losses (in securities)	1

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 item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months.

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- Definition

The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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