v3.25.4
Summary of Significant Accounting Policies - Narrative (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Jan. 31, 2026
USD ($)
segment
$ / shares
Jan. 31, 2025
USD ($)
$ / shares
Jan. 31, 2024
USD ($)
Accounting Policies [Line Items]      
Number of reportable segments | segment 3    
Common stock, par (in USD per share) | $ / shares $ 0.10 $ 0.10  
Cash and cash equivalents $ 10,727 $ 9,037  
Percentage of cash and cash equivalents 56.00% 62.00%  
Receivables from transactions with customers, net $ 4,900 $ 4,400  
Depreciation and amortization 14,203 12,973 $ 11,853
Indefinite-lived intangible assets (excluding goodwill) 4,300 4,500  
Equity and other securities, changes in fair value, gain (loss) $ 1,500 $ (4,200)  
Supplier Finance Program, Obligation, Statement of Financial Position [Extensible Enumeration] Accounts payable Accounts payable  
Membership and other income $ 6,750 $ 6,447 5,488
Advertising expense $ 5,400 5,100 4,400
Minimum      
Accounting Policies [Line Items]      
Supplier finance program, payment timing, period 30 days    
Maximum      
Accounting Policies [Line Items]      
Supplier finance program, payment timing, period 90 days    
Indemnification Agreement      
Accounting Policies [Line Items]      
Guarantor obligations, current carrying value $ 700 600  
Guarantor obligations, maximum exposure 3,400    
Membership Fees      
Accounting Policies [Line Items]      
Membership and other income 4,400 3,800 $ 3,100
Amounts Due from Banks      
Accounting Policies [Line Items]      
Cash and cash equivalents 4,400 2,300  
Nonrepatriable Cash and Cash Equivalents      
Accounting Policies [Line Items]      
Cash and cash equivalents $ 3,900 $ 3,300