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Long-term Debt and Borrowing Facilities (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Jul. 31, 2019
Jun. 30, 2019
Aug. 03, 2019
Aug. 04, 2018
Feb. 01, 2020
Feb. 02, 2019
Feb. 03, 2018
Interest Paid, Including Capitalized Interest, Operating and Investing Activities         $ 363 $ 380 $ 391
Repayments of Long-term Debt $ 130 $ 669     799 52 540
Gain (Loss) on Extinguishment of Debt     $ 40   (40) $ 0 $ (45)
Extinguishment of Debt, Gain (Loss), Net of Tax     $ 30        
Debt Exchange, Cash Consideration Paid       $ 52      
Debt Exchange, Exchange Premium       24      
With Subsidiary Guarantee [Member] | Fixed Rate 7.5% Notes Due June 2029 [Member]              
Debt Instrument, Face Amount   $ 500          
Debt Instrument, Interest Rate, Stated Percentage   7.50%          
Proceeds from Issuance of Debt         486    
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net         $ 14    
With Subsidiary Guarantee [Member] | Fixed Rate 7.00% Notes Due May 2020 [Member]              
Extinguishment of Debt, Amount $ 126 $ 212          
Debt Conversion, Original Debt, Amount       62      
With Subsidiary Guarantee [Member] | Fixed Rate 6.625% Notes Due April 2021 [Member]              
Extinguishment of Debt, Amount   330          
Debt Conversion, Original Debt, Amount       220      
With Subsidiary Guarantee [Member] | Fixed Rate 5.625% Notes Due February 2022 [Member]              
Extinguishment of Debt, Amount   $ 96          
Debt Conversion, Original Debt, Amount       44      
With Subsidiary Guarantee [Member] | Fixed Rate 6.694% Notes Due January 2027 [Member]              
Debt Conversion, Converted Instrument, Amount       $ 297      
Debt Conversion, Converted Instrument, Rate       6.694%