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Share-Based Compensation (Tables)
 12 Months Ended
Jan. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-Based Compensation Expense
Share-based compensation expense is as follows:
  
Fiscal Year
($ in millions)202020192018
Stock units$62 $52 $71 
Stock options12 12 16 
Employee stock purchase plan3 4 4 
Share-based compensation expense77 68 91 
Less: Income tax benefit(15)(23)(22)
Share-based compensation expense, net of tax$62 $45 $69 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The fair value of stock options issued to employees during fiscal 2020, 2019, and 2018 was estimated on the date of grant using the following assumptions:
 Fiscal Year
 202020192018
Expected term (in years)4.54.23.9
Expected volatility46.9 %37.5 %36.3 %
Dividend yield1.6 %4.1 %3.1 %
Risk-free interest rate0.4 %2.2 %2.5 %
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable [Table Text Block]
Information about stock options outstanding and exercisable as of January 30, 2021 is as follows:
Intrinsic Value as of January 30, 2021
(in millions)		Number of
Shares as of
January 30, 2021		Weighted-
Average
Remaining
Contractual
Life (in years)		Weighted-
Average
Exercise Price Per Share
Options Outstanding $58 12,391,932 7.6$20.27 
Options Exercisable $— 4,392,298 5.6$29.31 
Stock Options [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Payment Arrangement, Option, Activity [Table Text Block]
A summary of stock option activity under the 2016 Plan for fiscal 2020 is as follows:
SharesWeighted-
Average
Exercise Price Per Share
Balance as of February 1, 202011,436,022 $28.26 
Granted5,446,299 $9.22 
Exercised(99,300)$22.67 
Forfeited/Expired(4,391,089)$27.33 
Balance as of January 30, 202112,391,932 $20.27 
Additional Information About Stock Unit Activity [Table Text Block]
A summary of additional information about stock options is as follows: 
 Fiscal Year
  ($ in millions except per share amounts)
202020192018
Weighted-average fair value per share of stock options granted$3.28 $5.43 $7.75 
Aggregate intrinsic value of stock options exercised$— $1 $5 
Fair value of stock options vested$13 $16 $14 
Stock Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Payment Arrangement, Option, Activity [Table Text Block]
A summary of Stock Unit activity under the 2016 Plan for fiscal 2020 is as follows:
SharesWeighted-Average
Grant-Date
Fair Value Per Share
Balance as of February 1, 20206,962,409 $24.33 
Granted8,827,881 $11.22 
Vested(2,699,411)$24.26 
Forfeited(1,601,983)$16.80 
Balance as of January 30, 202111,488,896 $15.33 
Additional Information About Stock Unit Activity [Table Text Block]
A summary of additional information about Stock Units is as follows:
 Fiscal Year
 ($ in millions except per share amounts)
202020192018
Weighted-average fair value per share of Stock Units granted$11.22 $21.93 $29.33 
Fair value of Stock Units vested$65 $66 $58