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Investments - Summary of Marketable Securities (Details) - USD ($)
$ in Millions
Oct. 31, 2024
Jan. 31, 2024
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 5,978 $ 6,553
Unrealized Gains 19 15
Unrealized Losses (3) (8)
Aggregate Fair Value 5,994 6,560
Included in Cash and cash equivalents    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 148 759
Unrealized Gains 0 0
Unrealized Losses 0 0
Aggregate Fair Value 148 759
Included in Marketable securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 5,830 5,794
Unrealized Gains 19 15
Unrealized Losses (3) (8)
Aggregate Fair Value 5,846 5,801
U.S. treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 1,660 2,072
Unrealized Gains 5 4
Unrealized Losses (1) (2)
Aggregate Fair Value 1,664 2,074
U.S. agency obligations    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 694 753
Unrealized Gains 2 2
Unrealized Losses 0 (1)
Aggregate Fair Value 696 754
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 3,058 2,496
Unrealized Gains 12 9
Unrealized Losses (2) (5)
Aggregate Fair Value 3,068 2,500
Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 566 1,232
Unrealized Gains 0 0
Unrealized Losses 0 0
Aggregate Fair Value $ 566 $ 1,232