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Comprehensive Income (Accumulated Other Comprehensive Income, Net Of Tax) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning $ 5,279 $ 5,134 $ 4,600  
Net current-period other comprehensive income (19) 17 19  
Balance at ending 4,941 5,279 5,134  
OPEB [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Deferred tax items 23 29 23 $ 15
Accumulated Other Comprehensive Income [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning 96 79 60  
Net current-period other comprehensive income (19) 17 19  
Balance at ending 77 96 79  
Accumulated Other Comprehensive Income [Member] | OPEB [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning 96 79 60  
Other comprehensive income before reclassifications   34 30  
Amounts reclassified from accumulated other comprehensive loss to net income (19) (17) (11)  
Net current-period other comprehensive income (19) 17 19  
Balance at ending $ 77 $ 96 $ 79