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Revenue Recognition (Summary Of Changes In Contract Liabilities) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Revenue Recognition [Abstract]    
Contract current liabilities, Beginning balance $ 33 $ 28
Contract current liabilities, Revenue recognized included in opening contract balance (34) (37)
Contract current liabilities, Credits granted, excluding amounts recognized as revenue 36 37
Contract current liabilities, Reclassified between current and noncurrent (1) 5
Contract current liabilities, Ending balance 34 33
Contract noncurrent liabilities, Beginning balance 16 17
Contract noncurrent liabilities, Revenue recognized included in opening contract balance (19) (14)
Contract noncurrent liabilities, Credits granted, excluding amounts recognized as revenue 16 18
Contract noncurrent liabilities, Reclassified between current and noncurrent 1 (5)
Contract noncurrent liabilities, Ending balance $ 14 $ 16