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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Income Tax Disclosure [Line Items]        
Income tax expense (benefit), continuing operations, adjustment of deferred tax (asset) liability $ 92 $ 118    
Effective income tax rate reconciliation, percent 19.90% 39.50% 27.00%  
Income tax expense (benefit) $ 316 $ 524 $ 292  
Net operating loss carryforwards 2,800      
Net operating loss attributable to various acquired companies 91      
Net operating loss attributable to Switzerland 2,600      
Net operating loss attributable to U.S. federal 94      
Tax credit carry forwards 8      
Deferred tax assets, valuation allowance (464) (446)    
Gross unrecognized tax benefits 804 867 $ 636 $ 584
Unrecognized tax benefits that would impact effective tax rate 441      
Unrecognized tax benefits, income tax penalties and interest accrued $ 82 54    
Acquired IP intra-entity sales [Member]        
Income Tax Disclosure [Line Items]        
Income tax expense (benefit)   64    
Pro Forma        
Income Tax Disclosure [Line Items]        
Effective income tax rate reconciliation, percent 29.50%      
Non-US        
Income Tax Disclosure [Line Items]        
Cash, cash equivalents, and short-term investments $ 1,100      
Swiss Federal Tax Administration (FTA) [Member]        
Income Tax Disclosure [Line Items]        
Valuation allowance decrease   $ 29    
State [Member]        
Income Tax Disclosure [Line Items]        
Tax credit carry forwards $ 204