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Stock Compensation (Maximum Future Value of Performance Shares) (Details) (USD $) In Millions, except Share data, unless otherwise specified				9 Months Ended
	Feb. 25, 2012 Performance Shares Target Grant Two Thousand Nine [Member]	Sep. 29, 2012 Performance Shares Target Grant Twenty Ten [Member]	Sep. 29, 2012 Performance Shares Target Grant Twenty Eleven [Member]	Sep. 29, 2012 Performance Shares Target Grant Twenty Twelve [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum Future Value of Performance Shares		$ 20	$ 21	$ 24
Performance share grant target distribution				233,000
Performance share based awards cumulative target period, in years				3 years
Grant-date fair value of shares that correspond with target grants				$ 47
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%
Performance share award settlement in terms of original target	82.00%
Performance share award settlement in dollars	$ 7

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit 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 or units.

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