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Income Taxes - Components of Deferred Income Tax (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred tax assets |  |
Net operating loss (NOL) carryforwards | $ 226 | $ 183
Lease liabilities | 277 | 257
Asset retirement obligation | 101 | 81
Other | 157 | 109
Total deferred tax assets | 761 | 630
Less valuation allowance | (149) | (158)
Net deferred tax assets | 612 | 472
Deferred tax liabilities |  |
Property, plant and equipment | 751 | 652
Licenses/intangibles | 364 | 287
Partnership investments | 155 | 144
Lease assets | 255 | 235
Other | 6 | 17
Total deferred tax liabilities | 1,531 | 1,335
Net deferred income tax liability | 919 | 863
Other assets and deferred charges |  |
Deferred tax liabilities |  |
Net deferred income tax liability | (2) | 0
Deferred income tax liability, net |  |
Deferred tax liabilities |  |
Net deferred income tax liability | $ 921 | $ 863

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