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Income Taxes - Components of Deferred Income Tax (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Deferred tax assets |  |
Net operating loss (NOL) carryforwards | $ 142 | $ 132
Lease liabilities | 238 | 239
Contract liabilities | 58 | 59
Interest expense carryforwards | 125 | 99
Asset retirement obligation | 84 | 78
Other | 65 | 62
Total deferred tax assets | 712 | 669
Less valuation allowance | (181) | (146)
Net deferred tax assets | 531 | 523
Deferred tax liabilities |  |
Property, plant and equipment | 389 | 434
Licenses/intangibles | 421 | 408
Partnership investments | 191 | 180
Lease assets | 224 | 221
Other | 34 | 35
Total deferred tax liabilities | 1,259 | 1,278
Net deferred income tax liability | $ 728 | $ 755

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