Accumulated Other Comprehensive Loss (Reclassifications from Accumulated Other Comprehensive Loss) (Details) $ in Millions	3 Months Ended
	Apr. 29, 2017 USD ($)
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net periodic benefit cost (see Note 10)	$ 3
Income tax benefit	(1)
Net of tax	2
Pension Benefits [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net periodic benefit cost (see Note 10)	3
Postretirement Benefits [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net periodic benefit cost (see Note 10)