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Investments - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Oct. 31, 2024
Oct. 31, 2023
Oct. 31, 2024
Oct. 31, 2023
Jan. 31, 2024
Investments, Debt and Equity Securities [Abstract]          
Interest receivable $ 48   $ 48   $ 35
Credit and non-credit losses on debt securities 0 $ 0 0 $ 0  
Proceeds of sale of debt securities 48 24 115 42  
Equity securities without readily determinable fair value, upward price adjustment, annual amount 5   6    
Impairment loss on non-marketable equity securities 2 9   22  
Loss upon exit and impairment loss     13    
Equity securities, unrealized loss   4   2  
Equity securities $ 849 29 $ 849 29 $ 1,017
Proceeds from sale of available-for-sale securities, equity   $ 22   $ 52