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Income Taxes (Components Of Income (Loss) Before Income Taxes) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Domestic $ 233 $ 460 $ 1,087
Foreign 98 110 247
Income before income taxes $ 331 $ 570 $ 1,334