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Cash Equivalents and Marketable Securities - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Oct. 26, 2025
USD ($)
Apr. 27, 2025
investment
Oct. 27, 2024
USD ($)
Oct. 26, 2025
USD ($)
Oct. 27, 2024
USD ($)
Jul. 27, 2025
USD ($)
Jan. 26, 2025
USD ($)
Jul. 28, 2024
USD ($)
Jan. 28, 2024
USD ($)
Summary of cash equivalents and marketable securities:                  
Number of investments reclassified | investment   1              
Fair value of non-marketable equity securities reclassified to marketable securities $ 8,187   $ 2,237 $ 8,187 $ 2,237 $ 3,799 $ 3,387 $ 1,819 $ 1,321
Net unrealized gains on investments in publicly held equity securities 670   $ 0 2,400 $ 0        
Debt securities in a continuous loss position of twelve months or greater $ 337     $ 337     $ 213