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		9 Months Ended
	Oct. 31, 2020	Nov. 02, 2019	Oct. 31, 2020	Nov. 02, 2019
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized
Interest Rate Swap Derivative Instruments [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized	(32)	(8)	13	45
Carrying Value Of Long Term Debt [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized	$ 32	$ 8	$ (13)	$ (45)