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Income Taxes - Deferred Tax Assets And Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Mar. 31, 2023
Deferred tax assets:    
Accruals, reserves and other expenses $ 200 $ 197
Tax credit carryforwards 222 218
Research and development capitalization 375 461
Stock-based compensation 41 39
Net operating loss and capital loss carryforwards 403 371
Swiss intra-entity tax asset 1,618 1,665
Total 2,859 2,951
Valuation allowance (464) (446)
Deferred tax assets, net of valuation allowance 2,395 2,505
Deferred tax liabilities:    
Amortization and depreciation (10) (41)
Other (6) (3)
Total (16) (44)
Deferred tax assets, net of valuation allowance and deferred tax liabilities $ 2,379 $ 2,461