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Fair Value Measurements 3 (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Mar. 31, 2012
Cash and Cash Equivalents [Member] \| Money Market Funds [Member]
Fair Value Measurements (Details Textual) [Abstract]
Money market funds	$ 1,368	$ 1,324
Other Noncurrent Assets, Net [Member] \| Money Market Funds [Member]
Fair Value Measurements (Details Textual) [Abstract]
Money market funds	50	50
Accrued Expenses and Other Current Liabilities [Member] \| Facilities Abandonment Reserve [Member]
Fair Value Measurements (Details Textual) [Abstract]
Fair value of facilities abandonment reserve	15	16
Other Noncurrent Liabilities [Member] \| Facilities Abandonment Reserve [Member]
Fair Value Measurements (Details Textual) [Abstract]
Fair value of facilities abandonment reserve	$ 22	$ 26

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 investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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