v3.22.2.2
Investments - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Oct. 31, 2022
Oct. 31, 2021
Oct. 31, 2022
Oct. 31, 2021
Jan. 31, 2022
Schedule of Equity Method Investments [Line Items]          
Fair value of debt securities in an unrealized loss position $ 3,500   $ 3,500   $ 1,500
Credit and non-credit losses on debt securities 0 $ 0 0 $ 0  
Proceeds of sale of debt securities 20 0 48 10  
Upward price adjustment to non-marketable equity investments 2 20 8 34  
Impairment loss on non-marketable equity securities 2   10 2  
Gain (loss) on non-marketable equity securities 4   (2)    
Gain on sale of equity securities marketable equity investments     1    
Proceeds from sale of available-for-sale securities, equity 0 0 5 17  
Loss on sale of equity securities marketable equity investments       6  
Equity securities, unrealized gain 0     91  
Equity securities, unrealized loss $ 0 7 $ 17    
Zimit, Inc.          
Schedule of Equity Method Investments [Line Items]          
Gain on sale of equity securities marketable equity investments   $ 12   $ 12