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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 1,925	$ 1,779
Mark-to-market for economic hedging activities	44	20
Operating revenues	2,019	2,165
Lease revenue	5	5
Derivative revenue	55	27
Energy revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	124	290
Derivative revenue	53	320
Capacity revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	149	156
Derivative revenue	24	18
Retail revenue | Mass customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,378	1,313
Retail revenue | Business Solutions customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	283	276
Total retail revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,661	1,589
Derivative revenue
Disaggregation of Revenue [Line Items]
Mark-to-market for economic hedging activities	(4)	20
Derivative revenue	89	381
Other revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	89	110
Total operating revenue
Disaggregation of Revenue [Line Items]
Operating revenues	2,019	2,165
Other revenue, derivative
Disaggregation of Revenue [Line Items]
Derivative revenue	16	23
Corporate/Eliminations
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	(2)	(3)
Operating revenues	(3)	(2)
Lease revenue	0	0
Corporate/Eliminations | Energy revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	(1)	1
Derivative revenue	(1)	0
Corporate/Eliminations | Capacity revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Derivative revenue	0	0
Corporate/Eliminations | Retail revenue | Mass customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	(1)	(2)
Corporate/Eliminations | Retail revenue | Business Solutions customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Corporate/Eliminations | Total retail revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	(1)	(2)
Corporate/Eliminations | Derivative revenue
Disaggregation of Revenue [Line Items]
Mark-to-market for economic hedging activities	1	0
Derivative revenue	(1)	0
Corporate/Eliminations | Other revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	(2)	(2)
Corporate/Eliminations | Total operating revenue
Disaggregation of Revenue [Line Items]
Operating revenues	(3)	(3)
Corporate/Eliminations | Other revenue, derivative
Disaggregation of Revenue [Line Items]
Derivative revenue	(1)	0
Texas | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,351	1,151
Operating revenues	1,358	1,466
Lease revenue	0	0
Texas | Operating Segments | Energy revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5	105
Derivative revenue	0	271
Texas | Operating Segments | Capacity revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Derivative revenue	0	0
Texas | Operating Segments | Retail revenue | Mass customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,032	995
Texas | Operating Segments | Retail revenue | Business Solutions customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	260	258
Texas | Operating Segments | Total retail revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,292	1,253
Texas | Operating Segments | Derivative revenue
Disaggregation of Revenue [Line Items]
Mark-to-market for economic hedging activities	0	31
Derivative revenue	7	315
Texas | Operating Segments | Other revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	61	77
Texas | Operating Segments | Total operating revenue
Disaggregation of Revenue [Line Items]
Operating revenues	1,358	1,466
Texas | Operating Segments | Other revenue, derivative
Disaggregation of Revenue [Line Items]
Derivative revenue	7	13
East | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	500	555
Operating revenues	539	609
Lease revenue	0	0
East | Operating Segments | Energy revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	45	126
Derivative revenue	35	47
East | Operating Segments | Capacity revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	134	144
Derivative revenue	24	18
East | Operating Segments | Retail revenue | Mass customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	347	320
East | Operating Segments | Retail revenue | Business Solutions customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	23	18
East | Operating Segments | Total retail revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	370	338
East | Operating Segments | Derivative revenue
Disaggregation of Revenue [Line Items]
Mark-to-market for economic hedging activities	(20)	(15)
Derivative revenue	39	54
East | Operating Segments | Other revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	10	16
East | Operating Segments | Total operating revenue
Disaggregation of Revenue [Line Items]
Operating revenues	539	609
East | Operating Segments | Other revenue, derivative
Disaggregation of Revenue [Line Items]
Derivative revenue	0	4
West/Other | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	76	76
Operating revenues	125	93
Lease revenue	5	5
West/Other | Operating Segments | Energy revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	75	58
Derivative revenue	19	2
West/Other | Operating Segments | Capacity revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	15	12
Derivative revenue	0	0
West/Other | Operating Segments | Retail revenue | Mass customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
West/Other | Operating Segments | Retail revenue | Business Solutions customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
West/Other | Operating Segments | Total retail revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
West/Other | Operating Segments | Derivative revenue
Disaggregation of Revenue [Line Items]
Mark-to-market for economic hedging activities	15	4
Derivative revenue	44	12
West/Other | Operating Segments | Other revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	20	19
West/Other | Operating Segments | Total operating revenue
Disaggregation of Revenue [Line Items]
Operating revenues	125	93
West/Other | Operating Segments | Other revenue, derivative
Disaggregation of Revenue [Line Items]
Derivative revenue	$ 10	$ 6

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