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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 2,124 $ 1,783 $ 4,049 $ 3,562
Mark-to-market for economic hedging activities 87 21 131 41
Operating revenues 2,238 2,465 4,257 4,630
Lease revenue 5 5 10 10
Derivative revenue 86 33 141 60
Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (1) (2) (3) (5)
Operating revenues 0 (3) (3) (5)
Lease revenue 0 0 0 0
Retail revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 1,832 1,685 3,493 3,274
Retail revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 (1) (1) (3)
Energy revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 83 236 207 526
Derivative revenue 11 380 64 700
Energy revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (1) 0 (2) 1
Derivative revenue (1) 0 (2) 0
Capacity revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 195 201 344 357
Derivative revenue 41 30 65 48
Capacity revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Derivative revenue 0 1 0 1
Derivative revenue        
Disaggregation of Revenue [Line Items]        
Mark-to-market for economic hedging activities 43 241 39 261
Derivative revenue 109 677 198 1,058
Derivative revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Mark-to-market for economic hedging activities 2 (1) 3 (1)
Derivative revenue 1 0 0 0
Other revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 85 102 174 212
Other revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (1) 0 (3) (2)
Total operating revenue        
Disaggregation of Revenue [Line Items]        
Operating revenues 2,238 2,465 4,257 4,630
Total operating revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Operating revenues 0 (2) (3) (5)
Other revenue, derivative        
Disaggregation of Revenue [Line Items]        
Derivative revenue 14 26 30 49
Other revenue, derivative | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Derivative revenue 0 0 (1) 0
Mass customers | Retail revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 1,564 1,395 2,942 2,708
Mass customers | Retail revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 (1) (1) (3)
Business Solutions customers | Retail revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 268 290 551 566
Business Solutions customers | Retail revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Texas | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 1,571 1,258 2,922 2,409
Operating revenues 1,578 1,837 2,936 3,303
Lease revenue 0 0 0 0
Texas | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 1,521 1,433 2,813 2,686
Texas | Energy revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 5 136 10 241
Derivative revenue 0 355 0 626
Texas | Capacity revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Derivative revenue 0 0 0 0
Texas | Derivative revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Mark-to-market for economic hedging activities 0 210 0 241
Derivative revenue 7 579 14 894
Texas | Other revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 52 58 113 135
Texas | Total operating revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Operating revenues 1,578 1,837 2,936 3,303
Texas | Other revenue, derivative | Operating Segments        
Disaggregation of Revenue [Line Items]        
Derivative revenue 7 14 14 27
Texas | Mass customers | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 1,273 1,161 2,305 2,156
Texas | Business Solutions customers | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 248 272 508 530
East | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 480 459 980 1,014
Operating revenues 566 524 1,105 1,133
Lease revenue 1 1 1 1
East | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 311 253 681 591
East | Energy revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 19 48 64 174
Derivative revenue 2 20 37 67
East | Capacity revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 179 195 313 339
Derivative revenue 41 29 65 47
East | Derivative revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Mark-to-market for economic hedging activities 40 16 20 1
Derivative revenue 85 64 124 118
East | Other revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 17 12 27 28
East | Total operating revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Operating revenues 566 524 1,105 1,133
East | Other revenue, derivative | Operating Segments        
Disaggregation of Revenue [Line Items]        
Derivative revenue 2 (1) 2 3
East | Mass customers | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 291 235 638 555
East | Business Solutions customers | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 20 18 43 36
West/Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 74 68 150 144
Operating revenues 94 106 219 199
Lease revenue 4 4 9 9
West/Other | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
West/Other | Energy revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 60 52 135 110
Derivative revenue 10 5 29 7
West/Other | Capacity revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 16 6 31 18
Derivative revenue 0 0 0 0
West/Other | Derivative revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Mark-to-market for economic hedging activities 1 16 16 20
Derivative revenue 16 34 60 46
West/Other | Other revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 17 32 37 51
West/Other | Total operating revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Operating revenues 94 106 219 199
West/Other | Other revenue, derivative | Operating Segments        
Disaggregation of Revenue [Line Items]        
Derivative revenue 5 13 15 19
West/Other | Mass customers | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
West/Other | Business Solutions customers | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 0 $ 0 $ 0 $ 0