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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 | $ 126 | $ 107
Lease liabilities | 254 | 236
Asset retirement obligation | 64 | 51
Other | 130 | 83
Total deferred tax assets | 574 | 477
Less valuation allowance | (83) | (94)
Net deferred tax assets | 491 | 383
Deferred tax liabilities |  |
Property, plant and equipment | 446 | 391
Licenses/intangibles | 330 | 256
Partnership investments | 154 | 143
Lease assets | 232 | 215
Other | 3 | 11
Total deferred tax liabilities | 1,165 | 1,016
Net deferred income tax liability | $ 674 | $ 633

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