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Income Taxes - Components of Deferred Income Tax (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets |  |
Net operating loss (NOL) carryforwards | $ 96 | $ 103
Stock-based compensation | 16 | 20
Compensation and benefits - other | 5 | 5
Deferred rent | 20 | 21
Other | 73 | 59
Total deferred tax assets | 210 | 208
Less valuation allowance | (75) | (77)
Net deferred tax assets | 135 | 131
Deferred tax liabilities |  |
Property, plant and equipment | 256 | 276
Licenses/intangibles | 207 | 192
Partnership investments | 133 | 123
Other | 49 | 0
Total deferred tax liabilities | 645 | 591
Net deferred income tax liability | 510 | 460
Deferred income tax liability, net |  |
Deferred tax liabilities |  |
Net deferred income tax liability | 510 | 461
Other assets and deferred charges |  |
Deferred tax liabilities |  |
Net deferred income tax liability | $ 0 | $ (1)

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