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Income Taxes - Components of Deferred Income Tax (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets |  |
Net operating loss (NOL) carryforwards | $ 168 | $ 159
Lease liabilities | 251 | 0
Asset retirement obligation | 74 | 67
Other | 106 | 151
Total deferred tax assets | 599 | 377
Less valuation allowance | (152) | (135)
Net deferred tax assets | 447 | 242
Deferred tax liabilities |  |
Property, plant and equipment | 481 | 458
Licenses/intangibles | 261 | 237
Partnership investments | 132 | 134
Lease assets | 226 | 0
Other | 22 | 53
Total deferred tax liabilities | 1,122 | 882
Net deferred income tax liability | $ 675 | $ 640

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