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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