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Income taxes (Components of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred income tax assets: |  |
NOL and credit carryforwards | $ 800 | $ 810
Accrued expenses | 457 | 428
Expenses capitalized for tax | 170 | 185
Stock-based compensation | 91 | 95
Other | 269 | 174
Total deferred income tax assets | 1,787 | 1,692
Valuation allowance | (517) | (509)
Net deferred income tax assets | 1,270 | 1,183
Deferred income tax liabilities: |  |
Acquired intangible assets | (1,288) | (1,509)
Debt | (210) | (184)
Other | (286) | (267)
Total deferred income tax liabilities | (1,784) | (1,960)
Total deferred income taxes, net | $ (514) | $ (777)

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