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Pension and Other Benefit Plans - Pension Plan, Reconciliation of Changes in PBO and Fair Value of Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Projected benefit obligation at beginning of year $ 6,915 $ 6,937  
Service cost 52 53 $ 73
Interest cost 300 307 254
Plan participants’ contributions 7 21  
Amendments 13 6  
Business/contract acquisitions/divestitures 0 4  
Settlement/curtailment (23) (268)  
Actuarial (gain) loss (908) 67  
Benefits paid (286) (292)  
Foreign currency exchange rate changes 91 98  
Other (17) (18)  
Projected benefit obligation at end of year $ 6,144 $ 6,915 6,937
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]      
Discount rate 5.10% 4.40%  
Rates of increase in compensation levels 2.20% 2.40%  
Interest Crediting Rate 3.30% 2.70%  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year $ 7,318 $ 7,636  
Actual return on plan assets (229) 67  
Employer contribution 15 49  
Plan participants’ contributions 7 21  
Benefits paid (286) (292)  
Contractual termination benefits 0 1  
Plan settlement (21) (265)  
Foreign currency exchange rate changes 108 118  
Other (17) (17)  
Fair value of plan assets at end of year 6,895 7,318 $ 7,636
Funded status at end of year $ 751 $ 403