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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 2,684 $ 2,504 $ 6,733 $ 6,066
Mark-to-market for economic hedging activities (118) (64) 13 (23)
Operating revenues 2,809 2,996 7,066 7,626
Lease revenue 5 5 15 15
Derivative revenue (123) (68) 18 (8)
Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (3) 0 (6) (5)
Operating revenues 2 (2) (1) (7)
Lease revenue 0 0 0 0
Retail revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 2,302 2,488 5,795 5,762
Retail revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 (1) (3)
Energy revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 222 426 429 952
Derivative revenue 35 652 99 1,352
Energy revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 1 (1) (1) 0
Derivative revenue (1) (2) (3) (2)
Capacity revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 174 194 518 551
Derivative revenue 49 34 114 82
Capacity revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Derivative revenue 0 0 0 1
Derivative revenue        
Disaggregation of Revenue [Line Items]        
Mark-to-market for economic hedging activities 39 (210) 78 51
Derivative revenue 120 487 318 1,545
Derivative revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Mark-to-market for economic hedging activities 5 0 8 (1)
Derivative revenue 5 (2) 5 (2)
Other revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 72 98 246 310
Other revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (4) (1) (7) (3)
Total operating revenue        
Disaggregation of Revenue [Line Items]        
Operating revenues 2,809 2,996 7,066 7,626
Total operating revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Operating revenues 2 (2) (1) (7)
Other revenue, derivative        
Disaggregation of Revenue [Line Items]        
Derivative revenue (3) 11 27 60
Other revenue, derivative | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Derivative revenue 1 0 0 0
Mass customers | Retail revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 1,987 2,072 4,929 4,780
Mass customers | Retail revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 (1) (3)
Business Solutions customers | Retail revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 315 416 866 982
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 1,982 1,788 4,904 4,197
Operating revenues 1,992 2,208 4,928 5,511
Lease revenue 0 0 0 0
Texas | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 1,921 2,132 4,734 4,818
Texas | Energy revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 11 211 21 452
Derivative revenue 0 613 0 1,239
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 1 (213) 1 28
Derivative revenue 10 420 24 1,314
Texas | Other revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 59 78 172 213
Texas | Total operating revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Operating revenues 1,992 2,208 4,928 5,511
Texas | Other revenue, derivative | Operating Segments        
Disaggregation of Revenue [Line Items]        
Derivative revenue 9 20 23 47
Texas | Mass customers | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 1,633 1,735 3,938 3,891
Texas | Business Solutions customers | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 288 397 796 927
East | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 578 610 1,558 1,624
Operating revenues 693 679 1,798 1,812
Lease revenue 0 0 1 1
East | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 381 356 1,062 947
East | Energy revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 93 109 157 283
Derivative revenue 23 20 60 87
East | Capacity revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 158 185 471 524
Derivative revenue 49 34 114 81
East | Derivative revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Mark-to-market for economic hedging activities 43 12 63 13
Derivative revenue 115 69 239 187
East | Other revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 18 17 45 45
East | Total operating revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Operating revenues 693 679 1,798 1,812
East | Other revenue, derivative | Operating Segments        
Disaggregation of Revenue [Line Items]        
Derivative revenue 0 3 2 6
East | Mass customers | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 354 337 992 892
East | Business Solutions customers | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 27 19 70 55
West/Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 127 106 277 250
Operating revenues 122 111 341 310
Lease revenue 5 5 14 14
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 117 107 252 217
Derivative revenue 13 21 42 28
West/Other | Capacity revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 16 9 47 27
Derivative revenue 0 0 0 0
West/Other | Derivative revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Mark-to-market for economic hedging activities (10) (9) 6 11
Derivative revenue (10) 0 50 46
West/Other | Other revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (1) 4 36 55
West/Other | Total operating revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Operating revenues 122 111 341 310
West/Other | Other revenue, derivative | Operating Segments        
Disaggregation of Revenue [Line Items]        
Derivative revenue (13) (12) 2 7
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