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Derivative Instruments - Offsetting Assets (Details) - USD ($)
$ in Millions
Oct. 31, 2024
Jan. 31, 2024
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets $ 46 $ 46
Gross Amounts Offset on the Condensed Consolidated Balance Sheets 0  
Net Amounts of Assets Presented on the Condensed Consolidated Balance Sheets 46  
Gross Amounts Not Offset on the Condensed Consolidated Balance Sheets, Financial Instruments (25)  
Gross Amounts Not Offset on the Condensed Consolidated Balance Sheets, Cash Collateral Received 0  
Net Assets Exposed 21  
Counterparty A    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 13  
Gross Amounts Offset on the Condensed Consolidated Balance Sheets 0  
Net Amounts of Assets Presented on the Condensed Consolidated Balance Sheets 13  
Gross Amounts Not Offset on the Condensed Consolidated Balance Sheets, Financial Instruments (4)  
Gross Amounts Not Offset on the Condensed Consolidated Balance Sheets, Cash Collateral Received 0  
Net Assets Exposed 9  
Counterparty B    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 9  
Gross Amounts Offset on the Condensed Consolidated Balance Sheets 0  
Net Amounts of Assets Presented on the Condensed Consolidated Balance Sheets 9  
Gross Amounts Not Offset on the Condensed Consolidated Balance Sheets, Financial Instruments (6)  
Gross Amounts Not Offset on the Condensed Consolidated Balance Sheets, Cash Collateral Received 0  
Net Assets Exposed 3  
Counterparty C    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 3  
Gross Amounts Offset on the Condensed Consolidated Balance Sheets 0  
Net Amounts of Assets Presented on the Condensed Consolidated Balance Sheets 3  
Gross Amounts Not Offset on the Condensed Consolidated Balance Sheets, Financial Instruments (1)  
Gross Amounts Not Offset on the Condensed Consolidated Balance Sheets, Cash Collateral Received 0  
Net Assets Exposed 2  
Counterparty D    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 17  
Gross Amounts Offset on the Condensed Consolidated Balance Sheets 0  
Net Amounts of Assets Presented on the Condensed Consolidated Balance Sheets 17  
Gross Amounts Not Offset on the Condensed Consolidated Balance Sheets, Financial Instruments (13)  
Gross Amounts Not Offset on the Condensed Consolidated Balance Sheets, Cash Collateral Received 0  
Net Assets Exposed 4  
Counterparty E    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 1  
Gross Amounts Offset on the Condensed Consolidated Balance Sheets 0  
Net Amounts of Assets Presented on the Condensed Consolidated Balance Sheets 1  
Gross Amounts Not Offset on the Condensed Consolidated Balance Sheets, Financial Instruments 0  
Gross Amounts Not Offset on the Condensed Consolidated Balance Sheets, Cash Collateral Received 0  
Net Assets Exposed 1  
Counterparty F    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 2  
Gross Amounts Offset on the Condensed Consolidated Balance Sheets 0  
Net Amounts of Assets Presented on the Condensed Consolidated Balance Sheets 2  
Gross Amounts Not Offset on the Condensed Consolidated Balance Sheets, Financial Instruments (1)  
Gross Amounts Not Offset on the Condensed Consolidated Balance Sheets, Cash Collateral Received 0  
Net Assets Exposed 1  
Counterparty G    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 1  
Gross Amounts Offset on the Condensed Consolidated Balance Sheets 0  
Net Amounts of Assets Presented on the Condensed Consolidated Balance Sheets 1  
Gross Amounts Not Offset on the Condensed Consolidated Balance Sheets, Financial Instruments 0  
Gross Amounts Not Offset on the Condensed Consolidated Balance Sheets, Cash Collateral Received 0  
Net Assets Exposed $ 1