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Investments - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Oct. 31, 2023
Oct. 31, 2022
Oct. 31, 2023
Oct. 31, 2022
Jan. 31, 2023
Investments, Debt and Equity Securities [Abstract]          
Fair value of debt securities in an unrealized loss position $ 4,300   $ 4,300   $ 3,100
Credit and non-credit losses on debt securities 0 $ 0 0 $ 0  
Proceeds of sale of debt securities 24 20 42 48  
Impairment loss on non-marketable equity securities 9 2 22 10  
Upward price adjustment to non-marketable equity investments   2   8  
Gain (loss) on non-marketable equity securities   4   (2)  
Proceeds from sale of available-for-sale securities, equity 22 0 52 5  
Equity securities, unrealized loss $ 4 0 $ 2 $ 17  
Equity securities, unrealized gain   $ 0