Reserves for Closed Properties and Property, Plant and Equipment-Related Impairment Charges Reserves for Closed Property, Plant and Equipment-Related Impairment Charges - Additional detail (Details) $ in Millions	6 Months Ended
	Sep. 08, 2018 USD ($)
Property, Plant and Equipment [Line Items]
Carrying Value Asset Group	$ 51
Retail
Property, Plant and Equipment [Line Items]
Asset Impairment Charges	$ 44