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Estimates (Schedule Of Property, Plant And Equipment Depreciation And Capitalized Interest Expense) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accounting Policies [Abstract]      
Depreciation, depletion and amortization expense $ 3,465 $ 3,275 $ 2,839
Capitalized interest $ 135 $ 189 $ 166