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Fair Value Of Financial Instruments (Fair Value Of Long-Term Debt) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Carrying Amount [Member]    
Long-term debt [Abstract]    
Total debt $ 12,044 $ 11,569
Fair Value [Member]    
Long-term debt [Abstract]    
Total debt $ 12,264 $ 11,749