v3.26.1
Fair Value Measurements (Carrying Value and Fair Value of Long-Term Debt, Including Current Portion) (Details) - USD ($)
$ in Millions
Apr. 30, 2026
Jan. 31, 2026
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, including amounts due within one year $ 40,783 $ 38,166
Fair Value, Inputs, Level 2 | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, including amounts due within one year $ 38,944 $ 36,777