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Postretirement Health Care and Life Insurance Benefits (Assumed Health Care Cost Trend Rates) (Details)	12 Months Ended
	Jan. 28, 2012	Jan. 29, 2011
Rates to which is the cost trend rate is assumed to decline (the ultimate trend rate)	5.00%	5.00%
Year that the rate reaches the ultimate trend rate	2022	2022
Minimum [Member]
Health care cost trend rates assumed for the next year	8.08%	8.38%
Maximum [Member]
Health care cost trend rates assumed for the next year	9.62%	10.08%

The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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