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Income Taxes (Deferred Tax Assets And Liabilities) (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Mar. 31, 2022
Deferred tax assets:    
Accruals, reserves and other expenses $ 197 $ 185
Tax credit carryforwards 218 198
Research and development capitalization 461 66
Stock-based compensation 39 43
Net operating loss and capital loss carryforwards 371 349
Swiss intra-entity tax asset 1,665 1,782
Total 2,951 2,623
Valuation allowance (446) (296)
Deferred tax assets, net of valuation allowance 2,505 2,327
Deferred tax liabilities:    
Amortization and depreciation (41) (79)
Other (3) (7)
Total (44) (86)
Deferred tax assets, net of valuation allowance and deferred tax liabilities $ 2,461 $ 2,241