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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Income Tax Disclosure [Line Items]        
Income Tax Expense (Benefit) $ 524 $ 292 $ 180  
Net operating Loss Carryforwards 2,600      
Net operating loss attributable to Switzerland 2,300      
Net operating loss attributable to U.S. federal 99      
Tax credit carry forwards 12      
Gross unrecognized tax benefits 867 636 584 $ 983
Amount of unrecognized tax benefits that would affect the effective tax rate 395      
Combined amount of accrued interest and penalties related to uncertain tax positions 54 36    
Deferred Tax Assets, Valuation Allowance 446 296    
Deferred Tax Assets, Gross 2,951 2,623    
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability     $ 141  
Deferred Tax Assets, Net 2,461 2,241    
Swiss intra-entity tax asset $ 1,665 $ 1,782    
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00% 21.00%  
Effective Income Tax Rate Reconciliation, Percent 39.50% 27.00% 17.70%  
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent 0.00% (5.90%) 0.00%  
Valuation allowance decrease $ 118      
Net operating loss attributable to various acquired companies 213      
Acquired IP intra-entity sales [Member]        
Income Tax Disclosure [Line Items]        
Income Tax Expense (Benefit)   $ 64    
State [Member]        
Income Tax Disclosure [Line Items]        
Net operating loss attributable to California 133      
Tax credit carry forwards 194      
Foreign Tax Authority [Member]        
Income Tax Disclosure [Line Items]        
Cash, Cash Equivalents, and Short-term Investments $ 925      
Swiss Federal Tax Administration (FTA) [Member]        
Income Tax Disclosure [Line Items]        
Valuation allowance decrease   $ 29