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Income Taxes, Components of Deferred Income Tax (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets    
Net operating loss (NOL) carryforwards $ 103 $ 88
Stock-based compensation 20 26
Compensation and benefits - other 5 21
Deferred rent 21 21
Other 59 56
Total deferred tax assets 208 212
Less valuation allowance (77) (65)
Net deferred tax assets 131 147
Deferred tax liabilities    
Property, plant and equipment 276 473
Licenses/intangibles 192 326
Partnership investments 123 173
Total deferred tax liabilities 591 972
Net deferred income tax liability 460 825
Deferred income tax liability, net    
Deferred tax liabilities    
Net deferred income tax liability 461 826
Other assets and deferred charges (Non-current portion)    
Deferred tax liabilities    
Net deferred income tax liability $ (1) $ (1)