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Income Taxes (Schedule of Deferred Income Tax Assets and Liabilities) (Classification) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]    
Noncurrent assets (included in Other noncurrent assets) $ 38 $ 32
Total deferred income tax assets 38 32
Noncurrent liabilities (4,281) (1,360)
Total deferred income tax liabilities (4,281) (1,360)
Net deferred income tax liability $ (4,243) $ (1,328)