Annual report pursuant to Section 13 and 15(d)

Postretirement Health Care and Life Insurance Benefits (Assumed Health Care Cost Trend Rates) (Details)

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Postretirement Health Care and Life Insurance Benefits (Assumed Health Care Cost Trend Rates) (Details)
12 Months Ended
Jan. 30, 2016
Rate
Jan. 31, 2015
Rate
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 2027 2025
Minimum [Member]    
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year 7.27% 7.27%
Maximum [Member]    
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year 8.90% 9.20%