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, unless otherwise specified
 9 Months Ended
Oct. 29, 2011
Oct. 30, 2010
Accumulated Other Comprehensive Loss [Abstract]    
Accumulated other comprehensive loss, at beginning of period $ (730) $ (753)
Unrealized loss on marketable securities, net of income tax effect of $1 million and $0 million (2) 0
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 $26 million and $17 million 42 27
Prior service cost, net of income tax effect of $1 million and $1 million (1) (1)
Accumulated other comprehensive loss, at end of period (699) (727)
Income tax effect of unrealized loss on marketable securities 1 0
Income tax effect of reclassification adjustment due to realized gain on marketable securities 4  
Income tax effect of net actuarial (gain) loss 26 17
Income tax effect of prior service cost $ 1 $ 1