Basis of Presentation - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2024	Apr. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Effect of change	$ (211)	$ (38)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effect of change	$ (211)	(38)
Revision of Prior Period, Reclassification, Adjustment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Effect of change		30
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effect of change		$ 30