Stockholders' Equity - Summary of Dividends Declared (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
Apr. 30, 2026	Apr. 30, 2025
Share-Based Payment Arrangement [Abstract]
Dividend per Share (in dollars per share)	$ 0.440	$ 0.416
Payments of dividends and dividend equivalents	$ 374	$ 406

Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared, for example, but not limited to, common and preferred stock.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-SubTopic 405
-Topic 942
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477787/942-405-45-2

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