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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Income Tax Disclosure [Line Items]        
Income tax expense (benefit), continuing operations, adjustment of deferred tax (asset) liability $ (51) $ (92) $ (118)  
Net operating loss carryforwards 3,000      
Net operating loss attributable to various acquired companies 40      
Net operating loss attributable to Switzerland 2,900      
Net operating loss attributable to U.S. federal 31      
Tax credit carry forwards 6      
Deferred tax assets, valuation allowance (534) (464)    
Gross unrecognized tax benefits 688 804 $ 867 $ 636
Unrecognized tax benefits that would impact effective tax rate 482      
Unrecognized tax benefits, income tax penalties and interest accrued 127 $ 91    
Non-US        
Income Tax Disclosure [Line Items]        
Cash, cash equivalents, and short-term investments $ 1,100      
Pro Forma        
Income Tax Disclosure [Line Items]        
Effective income tax rate, excluding unrecognized tax benefits, percent 27.00% 26.70%    
State [Member]        
Income Tax Disclosure [Line Items]        
Tax credit carry forwards $ 219