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Capitalization - Long-term Debt, Additional Information (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |
Non-recourse debt | $ 2,737,000,000 | $ 2,076,000,000
Long-term debt | 19,973,000,000 | 18,145,000,000
PG&E Project |  |
Debt Instrument [Line Items] |  |
Long-term debt | 1,001,000,000 | 1,050,000,000
CECONY |  |
Debt Instrument [Line Items] |  |
Long-term debt | 14,964,000,000 | 14,151,000,000
CECONY | Tax-Exempt Debt |  |
Debt Instrument [Line Items] |  |
Debt instrument, face amount | 450,000,000 |
Long-term debt | $ 450,000,000 | $ 450,000,000

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