Derivative Instruments (Effects of Interest Rate Derivatives and Adjustments to LTD on Earnings) (Details) - Designated As Hedging Instrument [Member] - Interest Expense [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2021	Aug. 01, 2020	Jul. 31, 2021	Aug. 01, 2020
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized
Interest Rate Swap Derivative Instruments [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized	14	15	(12)	44
Carrying Value Of Long Term Debt [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized	$ (14)	$ (15)	$ 12	$ (44)