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Derivative Instruments - Pre-tax Gains (Losses) Associated with Cash Flow Hedges (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]        
Gains (losses) recognized in OCI $ (2) $ (20) $ (164) $ 11
Revenues        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) reclassified from AOCI into income (effective portion) 8 8 16 16
Costs and expenses        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) reclassified from AOCI into income (effective portion) 6 (3) 0 (4)
Other income, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) related to non-designated hedges $ (12) $ (3) $ (12) $ (1)