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Financial Instruments (Summary Of Gain Amounts Recognized In AOCI) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Designated Hedging Instruments | Foreign Exchange Contracts      
Derivative [Line Items]      
Unrealized Gain on Foreign Currency Derivatives, before Tax $ 0 $ 0 $ 0