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Pension Benefits - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Defined Benefit Plan Disclosure [Line Items]      
Percentage of eligible compensation (up to percent) 75.00%    
Contribution expenses $ 141 $ 128 $ 138
First Part Of Pay Contribution      
Defined Benefit Plan Disclosure [Line Items]      
Company match employee contributions (as a percent) 100.00%    
Employee contributions (as a percent) 3.00%    
Second Part Of Pay Contribution      
Defined Benefit Plan Disclosure [Line Items]      
Company match employee contributions (as a percent) 50.00%    
Employee contributions (as a percent) 2.00%    
UK Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Pension losses $ 53    
Defined benefit plan, plan assets, foreign currency translation gain (loss) 34    
Other Postretirement Benefits Plan      
Defined Benefit Plan Disclosure [Line Items]      
Net periodic pension expense 0 0 0
Defined benefit plan, benefit obligation 42 40  
Non-U.S. Plans | UK Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Non-cash pre-tax settlement charge (87)    
Non-U.S. Plans | Pension Plans, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Net periodic pension expense 3 60 $ 5
Defined benefit plan, benefit obligation 40 77  
Defined benefit plan assets 25 66  
Defined benefit plan, funded status (15) (11)  
Accumulated benefit obligations $ 39 $ 74