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Income Taxes - Components of Deferred Income Tax (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Deferred tax assets |  |
Net operating loss (NOL) carryforwards | $ 284 | $ 250
Lease liabilities | 260 | 265
Contract liabilities | 61 | 63
Interest expense carryforwards | 133 | 74
Asset retirement obligation | 123 | 116
Other | 98 | 129
Total deferred tax assets | 959 | 897
Less valuation allowance | (216) | (177)
Net deferred tax assets | 743 | 720
Deferred tax liabilities |  |
Property, plant and equipment | 841 | 805
Licenses/intangibles | 410 | 419
Partnership investments | 181 | 173
Lease assets | 242 | 245
Other | 44 | 43
Total deferred tax liabilities | 1,718 | 1,685
Net deferred income tax liability | 975 | 965
Other assets and deferred charges |  |
Deferred tax liabilities |  |
Net deferred income tax liability | 0 | (4)
Deferred income tax liability, net |  |
Deferred tax liabilities |  |
Net deferred income tax liability | $ 975 | $ 969

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