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Restructuring Costs - Restructuring Liability (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Restructuring Reserve [Roll Forward]      
Restructuring Liability, beginning balance $ 51    
Costs Expensed,
Net of Reversals 153 $ 111 $ 216
Costs Not Affecting Restructuring Liability (27)    
Cash Paid (137)    
Other (1)    
Restructuring Liability, ending balance 39 51  
Fiscal 2025 Plan      
Restructuring Reserve [Roll Forward]      
Restructuring Liability, beginning balance 0    
Costs Expensed,
Net of Reversals 130    
Costs Not Affecting Restructuring Liability (20)    
Cash Paid (83)    
Other (1)    
Restructuring Liability, ending balance 26 0  
Fiscal 2024 Plan      
Restructuring Reserve [Roll Forward]      
Restructuring Liability, beginning balance 10    
Costs Expensed,
Net of Reversals 19    
Costs Not Affecting Restructuring Liability (3)    
Cash Paid (25)    
Other (1)    
Restructuring Liability, ending balance 0 10  
Other Prior Year and Acquired Plans      
Restructuring Reserve [Roll Forward]      
Restructuring Liability, beginning balance 41    
Costs Expensed,
Net of Reversals 4    
Costs Not Affecting Restructuring Liability (4)    
Cash Paid (29)    
Other 1    
Restructuring Liability, ending balance 13 41  
Workforce Reductions | Fiscal 2025 Plan      
Restructuring Reserve [Roll Forward]      
Restructuring Liability, beginning balance 0    
Costs Expensed,
Net of Reversals 95    
Costs Not Affecting Restructuring Liability 1    
Cash Paid (70)    
Other 0    
Restructuring Liability, ending balance 26 0  
Workforce Reductions | Fiscal 2024 Plan      
Restructuring Reserve [Roll Forward]      
Restructuring Liability, beginning balance 8    
Costs Expensed,
Net of Reversals 0    
Costs Not Affecting Restructuring Liability 0    
Cash Paid (7)    
Other (1)    
Restructuring Liability, ending balance 0 8  
Workforce Reductions | Other Prior Year and Acquired Plans      
Restructuring Reserve [Roll Forward]      
Restructuring Liability, beginning balance 40    
Costs Expensed,
Net of Reversals (7)    
Costs Not Affecting Restructuring Liability 0    
Cash Paid (21)    
Other 0    
Restructuring Liability, ending balance 12 40  
Facilities Costs | Fiscal 2025 Plan      
Restructuring Reserve [Roll Forward]      
Restructuring Liability, beginning balance 0    
Costs Expensed,
Net of Reversals 35    
Costs Not Affecting Restructuring Liability (21)    
Cash Paid (13)    
Other (1)    
Restructuring Liability, ending balance 0 0  
Facilities Costs | Fiscal 2024 Plan      
Restructuring Reserve [Roll Forward]      
Restructuring Liability, beginning balance 2    
Costs Expensed,
Net of Reversals 19    
Costs Not Affecting Restructuring Liability (3)    
Cash Paid (18)    
Other 0    
Restructuring Liability, ending balance 0 2  
Facilities Costs | Other Prior Year and Acquired Plans      
Restructuring Reserve [Roll Forward]      
Restructuring Liability, beginning balance 1    
Costs Expensed,
Net of Reversals 11    
Costs Not Affecting Restructuring Liability (4)    
Cash Paid (8)    
Other 1    
Restructuring Liability, ending balance $ 1 $ 1