Fair Value Measurements - Information about Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions | Jul. 31, 2024 | Jan. 31, 2024 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Debt securities | $ 6,269 | $ 6,560 |
Foreign currency derivative assets | 44 | |
Foreign currency derivative liabilities | 28 | |
U.S. treasury securities | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Debt securities | 1,617 | 2,074 |
U.S. agency obligations | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Debt securities | 600 | 754 |
Corporate bonds | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Debt securities | 3,023 | 2,500 |
Commercial paper | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Debt securities | 1,029 | 1,232 |
Fair Value, Measurements, Recurring | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Foreign currency derivative assets | 44 | 46 |
Total assets | 7,069 | 7,623 |
Foreign currency derivative liabilities | 28 | 27 |
Total liabilities | 28 | 27 |
Fair Value, Measurements, Recurring | U.S. treasury securities | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Debt securities | 1,617 | 2,074 |
Fair Value, Measurements, Recurring | U.S. agency obligations | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Debt securities | 600 | 754 |
Fair Value, Measurements, Recurring | Corporate bonds | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Debt securities | 3,023 | 2,500 |
Fair Value, Measurements, Recurring | Commercial paper | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Debt securities | 1,029 | 1,232 |
Fair Value, Measurements, Recurring | Money market funds | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Money market funds | 756 | 1,017 |
Fair Value, Measurements, Recurring | Level 1 | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Foreign currency derivative assets | 0 | 0 |
Total assets | 2,373 | 3,091 |
Foreign currency derivative liabilities | 0 | 0 |
Total liabilities | 0 | 0 |
Fair Value, Measurements, Recurring | Level 1 | U.S. treasury securities | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Debt securities | 1,617 | 2,074 |
Fair Value, Measurements, Recurring | Level 1 | U.S. agency obligations | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Debt securities | 0 | 0 |
Fair Value, Measurements, Recurring | Level 1 | Corporate bonds | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Debt securities | 0 | 0 |
Fair Value, Measurements, Recurring | Level 1 | Commercial paper | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Debt securities | 0 | 0 |
Fair Value, Measurements, Recurring | Level 1 | Money market funds | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Money market funds | 756 | 1,017 |
Fair Value, Measurements, Recurring | Level 2 | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Foreign currency derivative assets | 44 | 46 |
Total assets | 4,696 | 4,532 |
Foreign currency derivative liabilities | 28 | 27 |
Total liabilities | 28 | 27 |
Fair Value, Measurements, Recurring | Level 2 | U.S. treasury securities | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Debt securities | 0 | 0 |
Fair Value, Measurements, Recurring | Level 2 | U.S. agency obligations | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Debt securities | 600 | 754 |
Fair Value, Measurements, Recurring | Level 2 | Corporate bonds | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Debt securities | 3,023 | 2,500 |
Fair Value, Measurements, Recurring | Level 2 | Commercial paper | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Debt securities | 1,029 | 1,232 |
Fair Value, Measurements, Recurring | Level 2 | Money market funds | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Money market funds | 0 | 0 |
Fair Value, Measurements, Recurring | Level 3 | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Foreign currency derivative assets | 0 | 0 |
Total assets | 0 | 0 |
Foreign currency derivative liabilities | 0 | 0 |
Total liabilities | 0 | 0 |
Fair Value, Measurements, Recurring | Level 3 | U.S. treasury securities | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Debt securities | 0 | 0 |
Fair Value, Measurements, Recurring | Level 3 | U.S. agency obligations | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Debt securities | 0 | 0 |
Fair Value, Measurements, Recurring | Level 3 | Corporate bonds | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Debt securities | 0 | 0 |
Fair Value, Measurements, Recurring | Level 3 | Commercial paper | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Debt securities | 0 | 0 |
Fair Value, Measurements, Recurring | Level 3 | Money market funds | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Money market funds | $ 0 | $ 0 |