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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 | $ 96 | $ 96
Lease liabilities | 230 | 0
Asset retirement obligation | 45 | 43
Other | 84 | 114
Total deferred tax assets | 455 | 253
Less valuation allowance | (90) | (75)
Net deferred tax assets | 365 | 178
Deferred tax liabilities |  |
Property, plant and equipment | 284 | 299
Licenses/intangibles | 230 | 207
Partnership investments | 131 | 133
Lease assets | 206 | 0
Other | 21 | 49
Total deferred tax liabilities | 872 | 688
Net deferred income tax liability | $ 507 | $ 510

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