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Acquisition-Related Intangible Assets, Net - Schedule of Acquired Assets (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jul. 31, 2025
Jul. 31, 2024
Jul. 31, 2025
Jul. 31, 2024
Jan. 31, 2025
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount $ 864   $ 864   $ 864
Accumulated Amortization (544)   (544)   (503)
Amortization of intangible assets 21 $ 20 42 $ 37  
Developed technology          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 473   473   473
Accumulated Amortization (327)   (327)   (303)
Net Book Value 146   146   170
Customer relationships          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 362   362   362
Accumulated Amortization (188)   (188)   (171)
Net Book Value 174   174   191
Backlog          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 15   15   15
Accumulated Amortization (15)   (15)   (15)
Net Book Value 0   0   0
Trade name          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount 14   14   14
Accumulated Amortization (14)   (14)   (14)
Net Book Value 0   0   0
Acquired Intangible Assets          
Finite-Lived Intangible Assets [Line Items]          
Net Book Value $ 320   $ 320   $ 361