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Accumulated Other Comprehensive Loss (Activity Associated With Accumulated Other Comprehensive Loss) (Parenthetical) (Detail) (USD $) In Millions	3 Months Ended
	Apr. 30, 2011	May 01, 2010
Accumulated Other Comprehensive Loss
Income tax effect of unrealized loss on marketable equity securities	$ 1	$ 1
Income tax effect of reclassification adjustment due to realized gain on marketable equity securities	4
Income tax effect of net actuarial (gain) loss	$ 9	$ 6

Tax effect on the reclassification adjustment for gains or losses realized upon the sale of securities during the period.

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- Definition

For each annual statement of income presented, the tax effect of the net gain (loss) recognized in other comprehensive income that is a reclassification adjustment of other comprehensive income as a result of being recognized as a component of net periodic benefit cost for the period.

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- Definition

Tax effect on gross appreciation or the gross loss in value of the total of unsold securities during the period being reported on.

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