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Derivative Instruments - Effect of Cash Flow Hedges on Income Statement (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Oct. 31, 2024
Oct. 31, 2023
Oct. 31, 2024
Oct. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items]        
Revenues $ 2,160 $ 1,866 $ 6,235 $ 5,337
Costs and expenses 1,995 1,778 5,895 5,233
Revenues        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) related to cash flow hedges 7 16 23 49
Costs and expenses        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) related to cash flow hedges $ 3 $ 1 $ (2) $ 2