Quarterly report pursuant to Section 13 or 15(d)

Accumulated Other Comprehensive Loss (Activity Associated With Accumulated Other Comprehensive Loss) (Details)

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Accumulated Other Comprehensive Loss (Activity Associated With Accumulated Other Comprehensive Loss) (Details) (USD $)
In Millions
 6 Months Ended
Jul. 30, 2011
Jul. 31, 2010
Accumulated other comprehensive loss, at beginning of period $ (730) $ (753)
Unrealized loss on marketable securities, net of income tax effect of $1 million and $1 million (2) (2)
Reclassification of realized gain on marketable securities to net income, net of income tax effect of $4 million (8) 0
Recognition of net actuarial (gain) loss, net of income tax effect of $17 million and $12 million 28 18
Prior service cost, net of income tax effect of less than $1 million and less than $1 million (1) (1)
Accumulated other comprehensive loss, at end of period (713) (738)
Income tax effect of unrealized loss on marketable securities 1 1
Income tax effect of reclassification adjustment due to realized gain on marketable securities 4  
Income tax effect of net actuarial (gain) loss 17 12
Maximum [Member]
    
Income tax effect of prior service cost $ 1 $ 1