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Income taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Deferred income tax assets: |  |
NOL and credit carryforwards | $ 1,352 | $ 1,465
Accrued expenses | 693 | 668
Capitalized research and development expenses | 1,762 | 1,333
Investments | 1 | 0
Expenses capitalized for tax | 200 | 210
Earnings of foreign subsidiaries | 1,496 | 1,260
Stock-based compensation | 130 | 159
Other | 361 | 416
Total deferred income tax assets | 5,995 | 5,511
Valuation allowance | (1,019) | (957)
Net deferred income tax assets | 4,976 | 4,554
Deferred income tax liabilities: |  |
Acquired intangible assets | (2,573) | (3,028)
Debt | (264) | (268)
Fixed assets | (143) | (140)
Fair value of acquired inventory | (114) | (349)
Investments | 0 | (99)
Other | (244) | (224)
Total deferred income tax liabilities | (3,338) | (4,108)
Total deferred income taxes, net | $ 1,638 | $ 446

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