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Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                
Accumulated other comprehensive income (loss) $ 16,384   $ 16,384     $ 15,612    
Interest Rate Derivatives, Tax 44 $ 43 (80) $ (17)        
Gains and Losses on Cash Flow Hedges                
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                
Accumulated other comprehensive income (loss) (56) (75) (56) (75) $ (57) (75) $ (80) $ (85)
Losses reclassified from net accumulated other comprehensive loss [1] 0 0 0 0        
Net current period other comprehensive income (loss) 1 5 19 10        
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 0 3 15 4        
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 2 4 6        
Defined Benefit Pension and Postretirement Items                
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                
Accumulated other comprehensive income (loss) (35) (51) (35) (51) (46) (48) (55) (56)
Losses reclassified from net accumulated other comprehensive loss [1] 1 4 2 5        
Net current period other comprehensive income (loss) 11 4 13 5        
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 10 0 11 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) (91) (126) (91) (126) $ (103) $ (123) $ (135) $ (141)
Losses reclassified from net accumulated other comprehensive loss [1] 1 4 2 5        
Net current period other comprehensive income (loss) 12 9 32 15        
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 10 3 26 4        
Total | Interest Rate Swap                
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                
Losses reclassified from net accumulated other comprehensive loss [2] $ 1 $ 2 $ 4 $ 6        
[1] Included in the computation of net periodic pension and postretirement benefit costs.
[2] Included in interest charges.