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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