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Revenue Recognition (Summary Of Changes In Contract Liabilities) (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Revenue Recognition [Abstract]    
Contract current liabilities, Beginning balance $ 34 $ 33
Contract current liabilities, Revenue recognized included in opening contract balance (31) (26)
Contract current liabilities, Credits granted, excluding amounts recognized as revenue 40 26
Contract current liabilities, Reclassified between current and noncurrent (3)  
Contract current liabilities, Ending balance 40 33
Contract noncurrent liabilities, Beginning balance 14 16
Contract noncurrent liabilities, Revenue recognized included in opening contract balance (14) (14)
Contract noncurrent liabilities, Credits granted, excluding amounts recognized as revenue 10 12
Contract noncurrent liabilities, Reclassified between current and noncurrent 3  
Contract noncurrent liabilities, Ending balance $ 13 $ 14