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Supplemental Cash Flow Information (Schedule Of Supplemental Information Relating To The Accompanying Condensed Consolidated Statements Of Cash Flows) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Cash paid for (received from):    
Interest expense $ 47 $ 51
Income tax payments, net of refunds 33 39
Interest income $ (2) $ (4)