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Royalties And Licenses - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Royalties And Licenses [Line Items]      
Asset impairment charges $ 0 $ 70 $ 106
Unrecorded unconditional purchase obligation 3,792    
Licensor Commitments      
Royalties And Licenses [Line Items]      
Asset impairment charges $ 0 $ 30 $ 0