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Derivative Instruments - Pre-tax Gains (Losses) Associated with Cash Flow Hedges (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Oct. 31, 2024
Oct. 31, 2023
Oct. 31, 2024
Oct. 31, 2023
Jan. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items]          
Gains (losses) recognized in OCI $ 0 $ 67 $ 11 $ 54  
Revenues 2,160 1,866 6,235 5,337  
Costs and expenses 1,995 1,778 5,895 5,233  
Derivative assets: 46   46   $ 46
Gross Amounts Offset on the Condensed Consolidated Balance Sheets 0   0    
Foreign currency derivative assets 46   46    
Gross Amounts Not Offset on the Condensed Consolidated Balance Sheets, Financial Instruments (25)   (25)    
Gross Amounts Not Offset on the Condensed Consolidated Balance Sheets, Cash Collateral Received 0   0    
Derivative Asset, Fair Value, Amount Offset Against Collateral 21   21    
Counterparty A          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative assets: 13   13    
Gross Amounts Offset on the Condensed Consolidated Balance Sheets 0   0    
Foreign currency derivative assets 13   13    
Gross Amounts Not Offset on the Condensed Consolidated Balance Sheets, Financial Instruments (4)   (4)    
Gross Amounts Not Offset on the Condensed Consolidated Balance Sheets, Cash Collateral Received 0   0    
Derivative Asset, Fair Value, Amount Offset Against Collateral 9   9    
Counterparty B          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative assets: 9   9    
Gross Amounts Offset on the Condensed Consolidated Balance Sheets 0   0    
Foreign currency derivative assets 9   9    
Gross Amounts Not Offset on the Condensed Consolidated Balance Sheets, Financial Instruments (6)   (6)    
Gross Amounts Not Offset on the Condensed Consolidated Balance Sheets, Cash Collateral Received 0   0    
Derivative Asset, Fair Value, Amount Offset Against Collateral 3   3    
Counterparty C          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative assets: 3   3    
Gross Amounts Offset on the Condensed Consolidated Balance Sheets 0   0    
Foreign currency derivative assets 3   3    
Gross Amounts Not Offset on the Condensed Consolidated Balance Sheets, Financial Instruments (1)   (1)    
Gross Amounts Not Offset on the Condensed Consolidated Balance Sheets, Cash Collateral Received 0   0    
Derivative Asset, Fair Value, Amount Offset Against Collateral 2   2    
Counterparty D          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative assets: 17   17    
Gross Amounts Offset on the Condensed Consolidated Balance Sheets 0   0    
Foreign currency derivative assets 17   17    
Gross Amounts Not Offset on the Condensed Consolidated Balance Sheets, Financial Instruments (13)   (13)    
Gross Amounts Not Offset on the Condensed Consolidated Balance Sheets, Cash Collateral Received 0   0    
Derivative Asset, Fair Value, Amount Offset Against Collateral 4   4    
Counterparty E          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative assets: 1   1    
Gross Amounts Offset on the Condensed Consolidated Balance Sheets 0   0    
Foreign currency derivative assets 1   1    
Gross Amounts Not Offset on the Condensed Consolidated Balance Sheets, Financial Instruments 0   0    
Gross Amounts Not Offset on the Condensed Consolidated Balance Sheets, Cash Collateral Received 0   0    
Derivative Asset, Fair Value, Amount Offset Against Collateral 1   1    
Counterparty F          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative assets: 2   2    
Gross Amounts Offset on the Condensed Consolidated Balance Sheets 0   0    
Foreign currency derivative assets 2   2    
Gross Amounts Not Offset on the Condensed Consolidated Balance Sheets, Financial Instruments (1)   (1)    
Gross Amounts Not Offset on the Condensed Consolidated Balance Sheets, Cash Collateral Received 0   0    
Derivative Asset, Fair Value, Amount Offset Against Collateral 1   1    
Revenues          
Derivative Instruments, Gain (Loss) [Line Items]          
Gains (losses) reclassified from AOCI into income (effective portion) 7 16 23 49  
Costs and expenses          
Derivative Instruments, Gain (Loss) [Line Items]          
Gains (losses) reclassified from AOCI into income (effective portion) 3 1 (2) 2  
Other income (expense), net          
Derivative Instruments, Gain (Loss) [Line Items]          
Gains (losses) related to non-designated hedges $ 0 $ 6 $ (2) $ 8