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Risk Management (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Jan. 31, 2019
Dec. 31, 2018
Derivative Liability, Collateral, Right to Reclaim Cash, Offset $ 11     $ 11
Net gain or (loss) recognized in the statement of income offset by regulatory accounting 49 $ 15    
Derivative, Net Liability Position, Aggregate Fair Value 107      
Collateral Already Posted, Aggregate Fair Value 43      
Collateral cash requirement 91      
Deposit Assets 0      
Derivative Liability     $ 5 4
Natural Gas [Member]        
Derivative Instruments and Hedges, Liabilities 2     4
4911 Electric Services [Member]        
Derivative Instruments and Hedges, Liabilities 69     84
Liabilities, Total [Member]        
Derivative Instruments and Hedges, Liabilities $ 71     88
Fair Value, Inputs, Level 2 [Member]        
Derivative Liability       $ 4