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Leases - Summary of Operating and Finance Leases (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jul. 31, 2021
Jul. 31, 2021
Jan. 30, 2021
Aug. 01, 2020
Assets        
Operating leases $ 2,301 $ 2,301 $ 2,398 $ 2,418
Finance leases $ 1,226 $ 1,226 $ 708  
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Property Plant And Equipment Net Property Plant And Equipment Net Property Plant And Equipment Net  
Total operating & finance leases $ 3,527 $ 3,527 $ 3,106  
Current liabilities:        
Operating leases 143 143 161 160
Finance leases $ 83 $ 83 $ 76  
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Finance Lease Liability And Financing Obligation Current Finance Lease Liability And Financing Obligation Current Finance Lease Liability And Financing Obligation Current  
Noncurrent        
Operating leases $ 2,532 $ 2,532 $ 2,625 $ 2,637
Finance leases $ 1,457 $ 1,457 $ 926  
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Finance Lease Liability And Financing Obligation Noncurrent Finance Lease Liability And Financing Obligation Noncurrent Finance Lease Liability And Financing Obligation Noncurrent  
Total operating & finance leases $ 4,215 $ 4,215 $ 3,788  
Income Statement        
Operating leases 79 156    
Finance Leases        
Amortization of leased assets 23 43    
Interest on leased assets 27 52    
Total operating and finance leases $ 129 251    
Cash paid for amounts included in the measurement of leased liabilities        
Operating cash flows from operating leases   165    
Operating cash flows from finance leases   52    
Financing cash flows from finance leases   $ 47