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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
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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)

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