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Income Taxes (Schedule of Deferred Income Tax Assets and Liabilities) (Classification) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]    
Noncurrent assets (included in other noncurrent assets) $ 32 $ 30
Total deferred income tax assets 32 30
Noncurrent liabilities (1,360) (1,468)
Total deferred income tax liabilities (1,360) (1,468)
Net deferred income tax liability $ (1,328) $ (1,438)