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Income Taxes - Components of Deferred Income Tax (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets    
Net operating loss (NOL) carryforwards $ 159 $ 167
Stock-based compensation 31 42
Compensation and benefits - other 8 9
Deferred rent 22 21
Other 90 70
Total deferred tax assets 310 309
Less valuation allowance (135) (147)
Net deferred tax assets 175 162
Deferred tax liabilities    
Property, plant and equipment 390 368
Licenses/intangibles 237 221
Partnership investments 134 123
Other 54 0
Total deferred tax liabilities 815 712
Net deferred income tax liability 640 550
Deferred income tax liability, net    
Deferred tax liabilities    
Net deferred income tax liability 640 552
Other assets and deferred charges    
Deferred tax liabilities    
Net deferred income tax liability $ 0 $ (2)