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Cloud Computing Arrangements (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jul. 31, 2023
Jul. 31, 2022
Jul. 31, 2023
Jul. 31, 2022
Jan. 31, 2023
Capitalized Contract Cost [Line Items]          
Amortization $ 9 $ 5 $ 18 $ 9  
Cloud-based Software Hosting Arrangements          
Capitalized Contract Cost [Line Items]          
Capitalized software development costs 220   220   $ 190
Accumulated amortization $ 59   $ 59   $ 41