Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant.

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Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Apr. 30, 2021	Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity and other securities, changes in fair value		$ (3,400)	$ (1,200)
Losses on disposal of business operations		$ 0	$ 0	$ 433
Fair Value, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Losses on disposal of business operations	$ (400)