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Long-Term Debt - Debt Summary (Details) - USD ($)
$ in Millions
Jan. 31, 2020
Feb. 01, 2019
Debt Instrument [Line Items]    
Total long-term debt $ 17,365 $ 15,501
Less current maturities (597) (1,110)
Long-term debt, excluding current maturities 16,768 14,391
Mortgage notes due through fiscal 2027    
Debt Instrument [Line Items]    
Real properties pledged as collateral $ 16  
Secured debt | Mortgage notes due through fiscal 2027    
Debt Instrument [Line Items]    
Weighted-average interest rate 5.23%  
Total long-term debt $ 5 6
Unsecured notes | Notes due through fiscal 2024    
Debt Instrument [Line Items]    
Weighted-average interest rate 3.70%  
Total long-term debt $ 3,232 4,278
Unsecured notes | Notes due fiscal 2025-2029    
Debt Instrument [Line Items]    
Weighted-average interest rate 3.57%  
Total long-term debt $ 5,749 4,256
Unsecured notes | Notes due fiscal 2035-2039    
Debt Instrument [Line Items]    
Weighted-average interest rate 5.96%  
Total long-term debt $ 897 897
Unsecured notes | Notes due fiscal 2040-2044    
Debt Instrument [Line Items]    
Weighted-average interest rate 4.82%  
Total long-term debt $ 1,757 1,757
Unsecured notes | Notes due fiscal 2045-2049    
Debt Instrument [Line Items]    
Weighted-average interest rate 3.89%  
Total long-term debt $ 5,013 3,533
Unsecured notes | Finance or capitalized lease obligations due through fiscal 2037    
Debt Instrument [Line Items]    
Total long-term debt $ 712 $ 774