Capitalization - Common Stock (Details) - shares	Dec. 31, 2022	Dec. 31, 2021
Schedule of Capitalization [Line Items]
Common stock, shares authorized (in shares)	500,000,000
Common stock, shares outstanding (in shares)	354,962,058	353,983,712
Treasury shares (in shares)	23,210,700	23,210,700
CECONY
Schedule of Capitalization [Line Items]
Common stock, shares authorized (in shares)	340,000,000
Common stock, shares outstanding (in shares)	235,488,094	235,488,094
Treasury shares (in shares)	21,976,200	21,976,200