Foreign Currency Derivative Instruments (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2011	Apr. 01, 2011
Derivative [Line Items]
Number of counterparties with concentration of credit risk and the maximum amount of loss	1
Maximum amount of loss for counterparty credit risk	$ 1
Forward Contracts [Member]
Derivative [Line Items]
Notional amount of derivatives outstanding	1,412	787
Estimated fair value of foreign currency derivative assets	2	9
Estimated fair value of foreign currency derivative liabilities	9	4
Option Contracts [Member]
Derivative [Line Items]
Notional amount of derivatives outstanding	$ 347	$ 676

Number of counterparties to foreign currency derivative instruments with concentration of credit risk and maximum loss.

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- Definition

Total monetary amount specified by the derivative(s). Expressed as an absolute value.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ Details

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- Definition

Fair value as of the balance sheet date of all foreign currency derivative assets not designated as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 17

+ Details

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- Definition

Fair value as of the balance sheet date of all foreign currency derivative liabilities not designated as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 17

+ Details

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- Definition

The amount at risk under repurchase agreements is defined as the excess of carrying amount (or market value, if higher than the carrying amount or if there is no carrying amount) of the securities or other assets sold under agreement to repurchase, including accrued interest plus any cash or other assets on deposit to secure the repurchase obligation, over the amount of the repurchase liability (adjusted for accrued interest). This item must be reported when the amount at risk under resale agreements with any individual counterparty or group of related counterparties exceeds 10 percent of stockholders' equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph m

-Subparagraph 1

-Article 4

+ Details

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