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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