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Derivative Instruments and Hedging Activities - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Investment Holdings [Line Items]      
Energy supply and hedging activities credit exposure total $ 106    
Makeup of net credit exposure with investment-grade counterparties 28    
Makeup of net credit exposure independent system operators 31    
Makeup of net credit exposure with commodity exchange brokers 19    
Makeup of net credit exposure non-investment grade/non-rated counterparties 28    
Interest Rate Swap      
Investment Holdings [Line Items]      
Derivative liability 6    
Derivative asset 2    
CECONY      
Investment Holdings [Line Items]      
Energy supply and hedging activities credit exposure total 13    
Makeup of net credit exposure with investment-grade counterparties 7    
Makeup of net credit exposure with commodity exchange brokers 6    
Clean Energy Businesses | Sempra Energy | Interest Rate Swap      
Investment Holdings [Line Items]      
Derivative liability 5    
Clean Energy Businesses | Coram | Interest Rate Swap      
Investment Holdings [Line Items]      
Derivative, fixed interest rate     2.0855%
Derivative liability   $ 0  
Derivative asset $ 1