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Capitalization - Schedule of Long-Term Debt Maturities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
2021 $ 1,967  
2022 437  
2023 966  
2024 385  
2025 315  
Long-term debt 22,349 $ 19,973
Long-term debt due within one year   1,446
CECONY    
Debt Instrument [Line Items]    
2021 640  
2022 0  
2024 250  
2025 0  
Long-term debt $ 16,789 14,964
Long-term debt due within one year   $ 350