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Risk Management (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jan. 31, 2019
Dec. 31, 2018
Derivative Liability, Collateral, Right to Reclaim Cash, Offset $ 11   $ 11     $ 11
Net gain or (loss) recognized in the statement of income offset by regulatory accounting 30 $ (9) (19) $ 6    
Derivative, Net Liability Position, Aggregate Fair Value 109   109      
Collateral Already Posted, Aggregate Fair Value 21   21      
Collateral cash requirement 103   103      
Deposit Assets 0   0      
Derivative Liability         $ 5 4
Natural Gas [Member]            
Derivative Instruments and Hedges, Liabilities 4   4     4
4911 Electric Services [Member]            
Derivative Instruments and Hedges, Liabilities 68   68     84
Liabilities, Total [Member]            
Derivative Instruments and Hedges, Liabilities $ 72   $ 72     88
Fair Value, Inputs, Level 2 [Member]            
Derivative Liability           $ 4