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Intangible Assets - Components of Amortization (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Finite-Lived Intangible Assets [Line Items]      
Total amortization expense $ 936 $ 971 $ 1,000
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]      
2026 687    
2027 491    
2028 215    
2029 102    
2030 57    
Thereafter 90    
Net Carrying Value 1,642 2,130  
Intangible asset amortization      
Finite-Lived Intangible Assets [Line Items]      
Total amortization expense 731 759 796
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]      
Net Carrying Value 142 175  
Transition and transformation contract cost amortization      
Finite-Lived Intangible Assets [Line Items]      
Total amortization expense $ 205 $ 212 $ 204