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Income Taxes - Components of Deferred Income Tax (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets    
Net operating loss (NOL) carryforwards $ 183 $ 168
Lease liabilities 257 251
Asset retirement obligation 81 74
Other 109 106
Total deferred tax assets 630 599
Less valuation allowance (158) (152)
Net deferred tax assets 472 447
Deferred tax liabilities    
Property, plant and equipment 652 481
Licenses/intangibles 287 261
Partnership investments 144 132
Lease assets 235 226
Other 17 22
Total deferred tax liabilities 1,335 1,122
Net deferred income tax liability $ 863 $ 675