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Fair Value Measurements, Including Derivatives (Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis and Included in Level 3) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Regulatory Assets        
Beginning balance $ 167 $ 295 $ 251 $ 148
Included in earnings:        
Purchased power 5 48 5 66
Settlements (5) (48) (5) (66)
Ending balance 171 267 171 267
Other Regulatory Assets Liabilities        
Included in earnings:        
Included in regulatory assets/liabilities $ 4 $ (28) $ (80) $ 119