Stock Compensation (Maximum Future Value of Performance Shares) (Details) (USD $) In Millions, except Share data, unless otherwise specified	Oct. 01, 2011	Feb. 28, 2011
Stock Compensation [Abstract]
2009 Award	$ 18
2010 Award	21
2011 Award	24
2011 performance share grant target distribution	225,000
Grant-date fair value of shares that correspond with target grants	$ 48
Number of performance shares that could be issued on the vesting date, minimum	0.00%
Number of performance shares that could be issued on the vesting date, maximum	200.00%
2008 Performance share award settlement in terms of original target		69.00%
2008 Performance share award settlement in dollars		$ 6

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Performance Award Settlement Stock Issued As Percentage Of Original Target

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Performance Awards Settlement Stock Issued Value

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Stock compensation

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The weighted average fair value of nonvested awards on share-based plans excluding option plans (for example, phantom stock plan, stock appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(2)(a)

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(2)(b)

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