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Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Accumulated other comprehensive income (loss) $ 19,804   $ 19,522  
Interest Rate Derivatives, Tax (61) $ (27)    
Gains and Losses on Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Accumulated other comprehensive income (loss) (33) (30) (29) $ (53)
Net current period other comprehensive income (loss) (4) 23    
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (5) 22    
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 [1] 1 1    
Defined Benefit Pension and Postretirement Items        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Accumulated other comprehensive income (loss) (39) (41) (39) (41)
Net current period other comprehensive income (loss) 0 0    
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 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 [1] 0 0    
Total        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Accumulated other comprehensive income (loss) (72) (71) $ (68) $ (94)
Net current period other comprehensive income (loss) (4) 23    
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (5) 22    
Total | Interest Rate Swap        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Losses reclassified from net accumulated other comprehensive loss [1] $ 1 $ 1    
[1] Included in interest charges.