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Pension Benefits - Narrative (Details)
$ in Millions
 12 Months Ended
Mar. 31, 2025
USD ($)
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Defined Benefit Plan Disclosure [Line Items]      
Percentage of eligible compensation (up to percent) 75.00%    
Contribution expenses $ 128 $ 138 $ 125
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    
Foreign exchange impact and other 34    
Defined benefit plan assets 7    
UK Pension Plan | Non-U.S. Plans      
Defined Benefit Plan Disclosure [Line Items]      
Pre-tax settlement gain (loss) $ (87)    
Pension Plans, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Unexpected actuarial losses (as a percent) (exceeding) 10.00%    
Expected contributions in next fiscal year $ 3    
Pension Plans, Defined Benefit | Non-U.S. Plans      
Defined Benefit Plan Disclosure [Line Items]      
Foreign exchange impact and other 1 2  
Defined benefit plan assets 66 171 $ 174
Actuarial gain (loss) $ (2) $ 0  
Discount rates 4.48% 4.55% 4.54%
Rate of increase in compensation 3.47% 3.21% 3.21%
Accumulated benefit obligations $ 74 $ 172  
Accumulated other comprehensive loss 12 58  
Defined benefit plan, benefit obligation $ 77 174 $ 172
Increase (decrease) in basis points 0.0007    
Net periodic pension expense $ 60 5 7
Pension Plans, Defined Benefit | Non-U.S. Plans | Norwegian Public Service Pension Fund (SPK)      
Defined Benefit Plan Disclosure [Line Items]      
Amount of plan asset value 34 30  
Pension Plans, Defined Benefit | Non-U.S. Plans | Unfunded plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, benefit obligation 19 19  
Other Postretirement Benefits Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, benefit obligation 40 42  
Net periodic pension expense 0 $ 0 0
Disposed of by Sale | E.U. Businesses (Disposal Group)      
Defined Benefit Plan Disclosure [Line Items]      
Disposal group, including discontinued operations, pension plan obligation derecognized     75
Disposal group, including discontinued operations, pension plan assets derecognized     49
Accumulated other comprehensive gain (loss) derecognized     17
Held-for-sale | E.U. And U.K. Businesses (Disposal Group)      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated other comprehensive gain (loss) derecognized     $ (17)
Held-for-sale | U.K. Businesses (Disposal Group)      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated other comprehensive gain (loss) derecognized $ (53)