Postretirement Health Care and Life Insurance Benefits (One Percentage Point Change In Assumed Health Care Cost Rates Would Have The Following Effects) (Details) - Other Postretirement Benefits Plan [Member] $ in Millions	12 Months Ended
	Feb. 02, 2019 USD ($)
Effect on total of service and interest cost, 1 - percentage point increase	$ 0
Effect on total of service and interest cost, 1 - percentage point decrease	0
Effect on accumulated postretirement benefit obligations, 1 - percentage point increase	7
Effect on accumulated postretirement benefit obligations, 1 - percentage point decrease	$ (6)