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Income Tax - Summary of Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Unrecognized Tax Benefits [Roll Forward]      
Balance at beginning of period $ 11 $ 23 $ 17
Additions based on tax positions related to the current year 4 8 3
Additions based on tax positions of prior years   3 6
Reductions for tax positions of prior years (6) (11) (1)
Settlements 0 (12) (2)
Balance at end of period 9 11 23
CECONY      
Unrecognized Tax Benefits [Roll Forward]      
Balance at beginning of period 7 8 5
Additions based on tax positions related to the current year 4 4 2
Additions based on tax positions of prior years 0 1 1
Reductions for tax positions of prior years (6) (6) 0
Settlements 0 0 0
Balance at end of period $ 5 $ 7 $ 8