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Income taxes (Components of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred income tax assets: |  |
NOL and credit carryforwards | $ 810 | $ 812
Accrued expenses | 428 | 362
Expenses capitalized for tax | 185 | 155
Stock-based compensation | 95 | 99
Other | 174 | 154
Total deferred income tax assets | 1,692 | 1,582
Valuation allowance | (509) | (497)
Net deferred income tax assets | 1,183 | 1,085
Deferred income tax liabilities: |  |
Acquired intangible assets | (1,509) | (1,748)
Debt | (184) | (184)
Other | (267) | (240)
Total deferred income tax liabilities | (1,960) | (2,172)
Total deferred income taxes, net | $ (777) | $ (1,087)

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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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