Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 27, 2019	Oct. 28, 2018	Oct. 27, 2019	Oct. 28, 2018
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ 60	$ (149)	$ 109	$ (3)
Tax expense (benefit) as percentage of income before income tax	6.30%	(13.80%)	5.60%