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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