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Accounting for Leases as a Lessee - Leases included in the Consolidated Balance Sheet (Details)
$ in Millions
Jan. 31, 2020
USD ($)
Operating Leases  
ROU Assets $ 1,053
Operating lease liabilities - current 203
Operating lease liabilities - non-current 940
Total operating lease liabilities 1,143
Finance Leases  
Gross finance lease ROU assets 53
Less: Accumulated depreciation (1)
Net finance lease ROU assets 52
Finance lease liabilities - current 4
Finance lease liabilities - non-current 56
Total finance lease liabilities 60
Total ROU assets 1,105
Total lease liabilities $ 1,203