Stock Based Compensation (Stock Option Activity) (Details) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Feb. 01, 2020 USD ($) $ / shares shares
Share-based Payment Arrangement, Noncash Expense [Abstract]
Outstanding, beginning of period, shares | shares	18,893
Outstanding, beginning of period, weighted average exercise price | $ / shares	$ 39.73
Granted, shares | shares	1,994
Granted, weighted average exercise price | $ / shares	$ 23.94
Canceled or forfeited, shares | shares	(1,731)
Canceled or forfeited, weighted average exercise price | $ / shares	$ 32.73
Exercised, shares | shares	(657)
Exercised, weighted average exercise price | $ / shares	$ 9.08
Outstanding, end of period, shares | shares	18,499
Outstanding, end of period, weighted average exercise price | $ / shares	$ 39.77
Exercisable, end of period, shares | shares	14,258
Exercisable, end of period, weighted average exercise price | $ / shares	$ 42.97
Exercisable, end of period, weighted average remaining contractual life (years)	4 years 2 months 12 days
Exercisable, end of period, aggregate intrinsic value | $	$ 0
Options expected to vest, shares | shares	3,133
Options expected to vest, weighted average exercise price | $ / shares	$ 29.20
Options expected to vest, weighted average remaining contractual life (years)	7 years 10 months 24 days
Options expected to vest, aggregate intrinsic value | $	$ 0