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Investments - Aggregate Fair Value and Gross Unrealized Losses for Debt Securities In Unrealized Loss Position (Details) - USD ($)
$ in Millions
Oct. 31, 2024
Jan. 31, 2024
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Fair Value $ 1,048 $ 2,081
Less than 12 Months, Unrealized Loss (3) (5)
12 Months or Greater, Fair Value 319 349
12 Months or Greater, Unrealized Loss 0 (3)
Fair Value 1,367 2,430
Unrealized Loss (3) (8)
U.S. treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Fair Value 266 921
Less than 12 Months, Unrealized Loss (1) (2)
12 Months or Greater, Fair Value 120 78
12 Months or Greater, Unrealized Loss 0 (1)
Fair Value 386 999
Unrealized Loss (1) (3)
U.S. agency obligations    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Fair Value 142 234
Less than 12 Months, Unrealized Loss 0 0
12 Months or Greater, Fair Value 15 100
12 Months or Greater, Unrealized Loss 0 (1)
Fair Value 157 334
Unrealized Loss 0 (1)
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Fair Value 640 921
Less than 12 Months, Unrealized Loss (2) (3)
12 Months or Greater, Fair Value 184 171
12 Months or Greater, Unrealized Loss 0 (1)
Fair Value 824 1,092
Unrealized Loss $ (2) (4)
Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Fair Value   5
Less than 12 Months, Unrealized Loss   0
12 Months or Greater, Fair Value   0
12 Months or Greater, Unrealized Loss   0
Fair Value   5
Unrealized Loss   $ 0