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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 | $ 268 | $ 284
Lease liabilities | 253 | 260
Contract liabilities | 60 | 61
Interest expense carryforwards | 176 | 133
Asset retirement obligation | 136 | 123
Other | 109 | 98
Total deferred tax assets | 1,002 | 959
Less valuation allowance | (266) | (216)
Net deferred tax assets | 736 | 743
Deferred tax liabilities |  |
Property, plant and equipment | 817 | 841
Licenses/intangibles | 423 | 410
Partnership investments | 191 | 181
Lease assets | 238 | 242
Other | 48 | 44
Total deferred tax liabilities | 1,717 | 1,718
Net deferred income tax liability | $ 981 | $ 975

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