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Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                
Accumulated other comprehensive income (loss) $ 15,171   $ 15,171     $ 14,575    
Interest Rate Derivatives, Tax 43 $ 43 (17) $ 24        
Gains and Losses on Cash Flow Hedges                
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                
Accumulated other comprehensive income (loss) (75) (86) (75) (86) $ (80) (85) $ (87) $ (80)
Losses reclassified from net accumulated other comprehensive loss [1] 0 0 0 0        
Net current period other comprehensive income (loss) 5 1 10 (6)        
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 3 0 4 (10)        
Gains and Losses on Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income                
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                
Other Comprehensive Income (Loss) before Reclassifications, Tax   0 1 (3)        
Interest Rate Derivatives, Tax 0 0 1 1        
Reclassification from AOCI, Current Period, Tax   0 0 0        
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] 2 1 6 4        
Defined Benefit Pension and Postretirement Items                
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                
Accumulated other comprehensive income (loss) (51) (57) (51) (57) (55) (56) (58) (61)
Losses reclassified from net accumulated other comprehensive loss [1] 4 1 5 4        
Net current period other comprehensive income (loss) 4 1 5 4        
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 0 0 0 0        
Defined Benefit Pension and Postretirement Items | Reclassification out of Accumulated Other Comprehensive Income                
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                
Other Comprehensive Income (Loss) before Reclassifications, Tax   0 0 0        
Interest Rate Derivatives, Tax 0 0 0 0        
Reclassification from AOCI, Current Period, Tax 1 0 2 1        
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) (126) (143) (126) (143) $ (135) $ (141) $ (145) $ (141)
Losses reclassified from net accumulated other comprehensive loss [1] 4 1 5 4        
Net current period other comprehensive income (loss) 9 2 15 (2)        
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 3 0 4 (10)        
Total | Interest Rate Swap                
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                
Losses reclassified from net accumulated other comprehensive loss [2] $ 2 $ 1 $ 6 $ 4        
[1] Included in the computation of net periodic pension and postretirement benefit costs.
[2] Included in interest charges.