Reclassifications from Accumulated Other Comprehensive Loss (Detail) $ in Millions	6 Months Ended
	Aug. 01, 2015 USD ($)
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net periodic benefit cost	$ 6
Income tax benefit	(2)
Net of tax	4
Pension Benefits
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net periodic benefit cost	7
Postretirement Benefits
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net periodic benefit cost	$ (1)