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Income taxes (Components of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred income tax assets: |  |
NOL and credit carryforwards | $ 1,065 | $ 794
Accrued expenses | 600 | 561
Expenses capitalized for tax | 244 | 144
Stock-based compensation | 96 | 92
Other | 326 | 301
Total deferred income tax assets | 2,331 | 1,892
Valuation allowance | (663) | (571)
Net deferred income tax assets | 1,668 | 1,321
Deferred income tax liabilities: |  |
Acquired intangible assets | (824) | (903)
Debt | (275) | (282)
Deferred Tax Liabilities, Property, Plant and Equipment | (129) | (148)
Other | (221) | (189)
Total deferred income tax liabilities | (1,449) | (1,522)
Total deferred income taxes, net | $ 219 |
Total deferred income taxes, net |  | $ (201)

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- Definition The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from acquired net operating loss and credit carryforwards and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken. + References No definition available. + Details
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