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Derivative Instruments - Effect of Cash Flow Hedges on Income Statement (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jul. 31, 2025
Jul. 31, 2024
Jul. 31, 2025
Jul. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items]        
Total revenues $ 2,348 $ 2,085 $ 4,588 $ 4,075
Costs and expenses 2,100 1,974 4,301 3,900
Revenues        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) related to cash flow hedges 8 8 16 16
Costs and expenses        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) related to cash flow hedges $ 6 $ (3) $ 0 $ (4)