Investments - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
Nov. 30, 2025	Jan. 31, 2026	Jan. 31, 2025	Jan. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Interest receivable		$ 33	$ 53
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]		Prepaid expenses and other current assets
Credit losses on debt securities		$ 0	0	$ 0
Proceeds from sale		2,900	273	59
Gain on sale of equity securities marketable equity investments		27	0	0
Equity securities without readily determinable fair value, gains, annual amount		64
Equity securities without readily determinable fair value, upward price adjustment, annual amount		17	5
Impairment loss on non-marketable equity securities		22		30
Loss upon exit and impairment loss			18
Equity securities without readily determinable fair value, downward price adjustment, annual amount			$ 5
Proceeds from sale of available-for-sale securities, equity				87
Non-cash gain on the sale of a non-marketable equity investment				$ 6
Sana
Debt Securities, Available-for-sale [Line Items]
Gain on remeasuring prior equity interest	$ 11	$ 11

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