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Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Accumulated other comprehensive income (loss) $ 16,818   $ 16,675  
Interest Rate Derivatives, Tax (53) $ (50)    
Gains and Losses on Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Accumulated other comprehensive income (loss) (58) (69) (54) $ (75)
Losses reclassified from net accumulated other comprehensive loss [1] 0 0    
Net current period other comprehensive income (loss) (4) 6    
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (5) 5    
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    
Defined Benefit Pension and Postretirement Items        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Accumulated other comprehensive income (loss) (39) (47) (39) (48)
Losses reclassified from net accumulated other comprehensive loss [1] 0 1    
Net current period other comprehensive income (loss) 0 1    
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 [2] 0 0    
Total        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Accumulated other comprehensive income (loss) (97) (116) $ (93) $ (123)
Losses reclassified from net accumulated other comprehensive loss [1] 0 1    
Net current period other comprehensive income (loss) (4) 7    
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (5) 5    
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    
[1] Included in the computation of net periodic pension and postretirement benefit costs.
[2] Included in interest charges.