DEBT - Outstanding Debt (Details) - USD ($)
$ in Millions
Apr. 30, 2021
Jan. 29, 2021
Sep. 07, 2016
Debt Instrument [Line Items]      
Total debt, principal amount $ 47,153 $ 48,480  
Unamortized discount, net of unamortized premium (185) (194)  
Debt issuance costs (285) (302)  
Total debt, carrying value 46,683 47,984  
Total short-term debt, carrying value 8,748 6,362  
Total long-term debt, carrying value 37,935 41,622  
DFS Debt      
Debt Instrument [Line Items]      
Total debt, principal amount 9,753    
2.46% Margin Loan Facility due April 2022      
Debt Instrument [Line Items]      
Total debt, principal amount 4,000    
Secured Debt | 2.00% Term Loan B-2 Facility due September 2025      
Debt Instrument [Line Items]      
Total debt, principal amount $ 3,135 3,143  
Interest rate at period end 2.00%    
Secured Debt | 1.90% Term Loan A-6 Facility due March 2024      
Debt Instrument [Line Items]      
Total debt, principal amount $ 3,134 3,134  
Interest rate at period end 1.90%    
Secured Debt | 5.45% due June 2023      
Debt Instrument [Line Items]      
Total debt, principal amount $ 3,750 3,750  
Interest rate 5.45%    
Secured Debt | 4.00% due July 2024      
Debt Instrument [Line Items]      
Total debt, principal amount $ 1,000 1,000  
Interest rate 4.00%    
Secured Debt | 5.85% due July 2025      
Debt Instrument [Line Items]      
Total debt, principal amount $ 1,000 1,000  
Interest rate 5.85%    
Secured Debt | 6.02% due June 2026      
Debt Instrument [Line Items]      
Total debt, principal amount $ 4,500 4,500  
Interest rate 6.02%    
Secured Debt | 4.90% due October 2026      
Debt Instrument [Line Items]      
Total debt, principal amount $ 1,750 1,750  
Interest rate 4.90%    
Secured Debt | 6.10% due July 2027      
Debt Instrument [Line Items]      
Total debt, principal amount $ 500 500  
Interest rate 6.10%    
Secured Debt | 5.30% due October 2029      
Debt Instrument [Line Items]      
Total debt, principal amount $ 1,750 1,750  
Interest rate 5.30%    
Secured Debt | 6.20% due July 2030      
Debt Instrument [Line Items]      
Total debt, principal amount $ 750 750  
Interest rate 6.20%    
Secured Debt | 8.10% due July 2036      
Debt Instrument [Line Items]      
Total debt, principal amount $ 1,500 1,500  
Interest rate 8.10%    
Secured Debt | 8.35% due July 2046      
Debt Instrument [Line Items]      
Total debt, principal amount $ 2,000 2,000  
Interest rate 8.35%    
Secured Debt | DFS Debt      
Debt Instrument [Line Items]      
Total debt, principal amount $ 9,753 9,666  
Total short-term debt, carrying value 4,673 4,888  
Total long-term debt, carrying value 5,080 4,778  
Unsecured Debt | 4.625% due April 2021      
Debt Instrument [Line Items]      
Total debt, principal amount $ 0 400  
Interest rate 4.625%    
Unsecured Debt | 7.10% due April 2028      
Debt Instrument [Line Items]      
Total debt, principal amount $ 300 300  
Interest rate 7.10%    
Unsecured Debt | 6.50% due April 2038      
Debt Instrument [Line Items]      
Total debt, principal amount $ 388 388  
Interest rate 6.50%    
Unsecured Debt | 5.40% due September 2040      
Debt Instrument [Line Items]      
Total debt, principal amount $ 264 264  
Interest rate 5.40%    
Unsecured Debt | 5.875% due June 2021      
Debt Instrument [Line Items]      
Total debt, principal amount $ 0 1,075  
Interest rate 5.875%    
Unsecured Debt | 7.125% due June 2024      
Debt Instrument [Line Items]      
Total debt, principal amount $ 1,625 1,625  
Interest rate 7.125%    
Unsecured Debt | 3.375% due June 2023      
Debt Instrument [Line Items]      
Total debt, principal amount $ 1,000 1,000 $ 1,000
Interest rate 3.375%    
Unsecured Debt | 2.95% due August 2022      
Debt Instrument [Line Items]      
Total debt, principal amount $ 1,500 1,500  
Interest rate 2.95%    
Unsecured Debt | 4.50% due May 2025      
Debt Instrument [Line Items]      
Total debt, principal amount $ 750 750  
Interest rate 4.50%    
Unsecured Debt | 4.65% due May 2027      
Debt Instrument [Line Items]      
Total debt, principal amount $ 500 500  
Interest rate 4.65%    
Unsecured Debt | 3.90% due August 2027      
Debt Instrument [Line Items]      
Total debt, principal amount $ 1,250 1,250  
Interest rate 3.90%    
Unsecured Debt | 4.70% due May 2030      
Debt Instrument [Line Items]      
Total debt, principal amount $ 750 750  
Interest rate 4.70%    
Other      
Debt Instrument [Line Items]      
Total debt, principal amount $ 304 235  
Other | 2.46% Margin Loan Facility due April 2022      
Debt Instrument [Line Items]      
Total debt, principal amount $ 4,000 $ 4,000  
Interest rate at period end 2.46%