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Capitalization - Schedule of Long-Term Debt Maturities (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
2020 $ 518  
2021 1,967  
2022 437  
2023 316  
2024 385  
Long-term debt 19,973 $ 18,145
Long-term debt due within one year 1,446 650
CECONY    
Debt Instrument [Line Items]    
2020 350  
2021 640  
2023 0  
2024 250  
Long-term debt 14,964 14,151
Long-term debt due within one year 350 475
PG&E Project    
Debt Instrument [Line Items]    
Long-term debt 1,001 $ 1,050
Long-term debt due within one year 928  
PG&E Project Debt Maturing 2020 | PG&E Project    
Debt Instrument [Line Items]    
Long-term debt $ 73