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Income taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Deferred income tax assets: |  |
NOL and credit carryforwards | $ 1,465 | $ 1,344
Accrued expenses | 668 | 584
Capitalized research and development expenses | 1,333 | 515
Investments | 0 | 270
Expenses capitalized for tax | 210 | 211
Earnings of foreign subsidiaries | 1,260 | 192
Stock-based compensation | 159 | 104
Other | 416 | 317
Total deferred income tax assets | 5,511 | 3,537
Valuation allowance | (957) | (718)
Net deferred income tax assets | 4,554 | 2,819
Deferred income tax liabilities: |  |
Acquired intangible assets | (3,028) | (1,238)
Debt | (268) | (272)
Fixed assets | (140) | (112)
Fair value of acquired inventory | (349) | (5)
Investments | (99) | 0
Other | (224) | (249)
Total deferred income tax liabilities | (4,108) | (1,876)
Total deferred income taxes, net | $ 446 | $ 943

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