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Property and Leases - Schedule of assets and liabilities related to operating and finance leases (Details) - USD ($)
$ in Millions
Oct. 31, 2021
Jan. 31, 2021
Assets    
Operating lease assets $ 5,903 $ 5,962
Finance lease assets 2,894 2,493
Total lease assets 8,797 8,455
Current:    
Operating lease liabilities 827 828
Finance lease liabilities 188 66
Long-term:    
Operating lease liabilities 5,290 5,356
Finance lease liabilities 3,033 2,700
Total lease liabilities 9,338 8,950
Finance lease asset accumulated amortization $ 987 $ 815