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Income Taxes - Deferred Tax Assets And Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Mar. 31, 2024
Deferred tax assets:    
Accruals, reserves and other expenses $ 227 $ 200
Tax credit carryforwards 235 222
Research and development capitalization 523 375
Stock-based compensation 43 41
Net operating loss and capital loss carryforwards 450 403
Swiss intra-entity tax asset 1,485 1,618
Total 2,963 2,859
Valuation allowance (534) (464)
Deferred tax assets, net of valuation allowance 2,429 2,395
Deferred tax liabilities:    
Amortization and depreciation (7) (10)
Other (3) (6)
Total (10) (16)
Deferred tax assets, net of valuation allowance and deferred tax liabilities $ 2,419 $ 2,379