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Debt And Credit Facilities (Narrative) (Details)
$ in Millions
3 Months Ended 9 Months Ended
Oct. 31, 2020
USD ($)
Aug. 01, 2020
USD ($)
May 02, 2020
USD ($)
Oct. 31, 2020
USD ($)
Nov. 02, 2019
USD ($)
Feb. 01, 2020
USD ($)
Debt Instrument [Line Items]            
Proceeds from issuance of long-term debt       $ 600 $ 0  
Proceeds from revolving line of credit       $ 800 0  
Number of options to extend revolver 2     2    
Borrowings under revolving line of credit $ 200     $ 200 0 $ 0
Payments on revolving line of credit 300 $ 300   600 $ 0  
Commercial paper [Member]            
Debt Instrument [Line Items]            
Maximum borrowing capacity 800     800    
Borrowings not available at this time 0     0    
Issuances or borrowings 0     $ 0    
Senior Secured Notes 8.750% due May 2025, net of unamortized discount [Member]            
Debt Instrument [Line Items]            
Proceeds from issuance of long-term debt $ 600          
Debt instrument interest rate 8.75%     8.75%    
Revolver [Member]            
Debt Instrument [Line Items]            
Proceeds from revolving line of credit     $ 800      
Debt covenant leverage ratio       4    
Option to increase the maximum capacity of revolving credit facility $ 200     $ 200    
Maximum borrowing capacity $ 1,000     $ 1,000