Stockholders' Equity - Share-based Compensation, Stock Options, Activity (Details) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
Apr. 30, 2024 USD ($) $ / shares shares
Outstanding Stock Options
Beginning balance (in shares) \| shares	12
Exercised (in shares) \| shares	(1)
Ending balance (in shares) \| shares	11
Outstanding Stock Options, Vested or expected to vest (in shares) \| shares	11
Outstanding Stock Options, Exercisable (in shares) \| shares	7
Options Outstanding Weighted-Average Exercise Price
Beginning balance (in dollars per share) \| $ / shares	$ 185.77
Exercised (in dollars per share) \| $ / shares	174.62
Ending balance (in dollars per share) \| $ / shares	190.70
Weighted-Average Exercise Price, Vested or expected to vest (in dollars per share) \| $ / shares	190.10
Weighted-Average Exercise Price, Exercisable (in dollars per share) \| $ / shares	$ 175.19
Aggregate Intrinsic Value
Balance \| $	$ 1,222
Vested or expected to vest \| $	1,192
Exercisable \| $	$ 874

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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- Definition

Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Number of share options (or share units) exercised during the current period.

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