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Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                
Accumulated other comprehensive income (loss) $ 19,352   $ 19,352     $ 17,616    
Interest Rate Derivatives, Tax 10 $ 40 (105) $ (101)        
Gains and Losses on Cash Flow Hedges                
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                
Accumulated other comprehensive income (loss) (29) (40) (29) (40) $ (30) (53) $ (44) $ (54)
Losses reclassified from net accumulated other comprehensive loss [1]     0 0        
Net current period other comprehensive income (loss) 1 4 24 14        
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 0 3 22 11        
Gains and Losses on Cash Flow Hedges | Interest Rate Swap                
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                
Losses reclassified from net accumulated other comprehensive loss [2] 1 1 2 3        
Defined Benefit Pension and Postretirement Items                
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                
Accumulated other comprehensive income (loss) (37) (38) (37) (38) (37) (41) (38) (39)
Losses reclassified from net accumulated other comprehensive loss [1]     4 1        
Net current period other comprehensive income (loss) 0 0 4 1        
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 0 0 0 0        
Defined Benefit Pension and Postretirement Items | Interest Rate Swap                
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                
Losses reclassified from net accumulated other comprehensive loss [2] 0 0 0 0        
Total                
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                
Accumulated other comprehensive income (loss) (66) (78) (66) (78) $ (67) $ (94) $ (82) $ (93)
Losses reclassified from net accumulated other comprehensive loss [1]     4 1        
Net current period other comprehensive income (loss) 1 4 28 15        
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 0 3 22 11        
Total | Interest Rate Swap                
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                
Losses reclassified from net accumulated other comprehensive loss [2] $ 1 $ 1 $ 2 $ 3        
[1] Included in the computation of net periodic pension and postretirement benefit costs. See Note 9 for further information.
[2] Included in interest charges.