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Income Taxes (Schedule of Deferred Income Tax Assets and Liabilities) (Classification) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]    
Total deferred income tax assets $ 40 $ 38
Total deferred income tax liabilities (4,017) (4,281)
Net deferred income tax liability $ (3,977) $ (4,243)