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Income Taxes (Schedule Of The Provision For (Benefit From) Income Taxes) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current      
Federal $ (208) $ 20 $ 158
State 6 9 28
Foreign 14 25 52
Total Current (188) 54 238
Deferred      
Federal 154 69 59
State (13) 11 (2)
Foreign 5 (26) 5
Total Deferred 146 54 62
Provision for (benefit from) income taxes $ (42) $ 108 $ 300