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Income Taxes (Schedule Of Changes In Unrecognized Tax Benefits) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]      
Unrecognized tax benefits, Balance at beginning of year $ 23 $ 65  
Unrecognized tax benefits, Tax positions taken in prior periods (increase) 5   $ 14
Unrecognized tax benefits, Tax positions taken in prior periods (decrease)   (42)  
Assumed WPX tax positions taken in prior periods 8    
Unrecognized tax benefits, Balance at end of year $ 36 $ 23 $ 65