XML 91 R73.htm IDEA: XBRL DOCUMENT v3.20.4
Revenue Recognition - Disaggregated Revenues (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer $ 8,690 $ 7,991 $ 8,148
Mark-to-market for economic hedging activities (119) (20) 14
Revenues 9,093 9,821 9,478
Less: Lease revenue 18 20 21
Derivative revenue (124) 0 31
Retail Revenue | Mass customers      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer 6,331 6,254 5,591
Retail Revenue | Business Solutions customers      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer 1,129 1,279 1,303
Total retail revenue      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer 7,460 7,533 6,894
Energy revenue      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer 539 1,169 1,496
Derivative revenue 105 1,595 1,233
Capacity revenue      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer 680 700 825
Derivative revenue 156 109 137
Derivative revenue      
Disaggregation of Revenue [Line Items]      
Mark-to-market for economic hedging activities 95 33 (130)
Derivative revenue 385 1,810 1,309
Other revenue      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer 319 386 393
Total operating revenues      
Disaggregation of Revenue [Line Items]      
Revenues 9,093 9,821 9,478
Other derivative revenue      
Disaggregation of Revenue [Line Items]      
Derivative revenue 29 73 69
Corporate/Eliminations      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer (7) (5) (19)
Revenues (4) (7) (18)
Less: Lease revenue 0 0 0
Corporate/Eliminations | Retail Revenue | Mass customers      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer (2) (3) (1)
Corporate/Eliminations | Retail Revenue | Business Solutions customers      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer 0 0 0
Corporate/Eliminations | Total retail revenue      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer (2) (3) (1)
Corporate/Eliminations | Energy revenue      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer (1) 0 13
Derivative revenue (5) (1) 14
Corporate/Eliminations | Capacity revenue      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer (1) 0 0
Derivative revenue 0 0 0
Corporate/Eliminations | Derivative revenue      
Disaggregation of Revenue [Line Items]      
Mark-to-market for economic hedging activities 8 (1) (13)
Derivative revenue 3 (2) 1
Corporate/Eliminations | Other revenue      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer (8) (3) (17)
Corporate/Eliminations | Total operating revenues      
Disaggregation of Revenue [Line Items]      
Revenues (4) (7) (18)
Corporate/Eliminations | Other derivative revenue      
Disaggregation of Revenue [Line Items]      
Derivative revenue 0 0 1
Texas | Operating Segments      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer 6,279 5,507 5,304
Revenues 6,309 7,069 6,401
Less: Lease revenue 0 0 1
Texas | Operating Segments | Retail Revenue | Mass customers      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer 5,027 5,027 4,618
Texas | Operating Segments | Retail Revenue | Business Solutions customers      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer 1,034 1,205 1,238
Texas | Operating Segments | Total retail revenue      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer 6,061 6,232 5,856
Texas | Operating Segments | Energy revenue      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer 24 529 371
Derivative revenue 0 1,459 1,131
Texas | Operating Segments | Capacity revenue      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer 0 0 0
Derivative revenue 0 0 0
Texas | Operating Segments | Derivative revenue      
Disaggregation of Revenue [Line Items]      
Mark-to-market for economic hedging activities 2 47 (77)
Derivative revenue 30 1,562 1,096
Texas | Operating Segments | Other revenue      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer 222 261 251
Texas | Operating Segments | Total operating revenues      
Disaggregation of Revenue [Line Items]      
Revenues 6,309 7,069 6,401
Texas | Operating Segments | Other derivative revenue      
Disaggregation of Revenue [Line Items]      
Derivative revenue 28 56 42
Texas | Corporate/Eliminations      
Disaggregation of Revenue [Line Items]      
Revenues (6) (1) (19)
East | Operating Segments      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer 2,039 2,135 2,160
Revenues 2,354 2,319 2,371
Less: Lease revenue 1 1 1
East | Operating Segments | Retail Revenue | Mass customers      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer 1,306 1,230 974
East | Operating Segments | Retail Revenue | Business Solutions customers      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer 95 74 65
East | Operating Segments | Total retail revenue      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer 1,401 1,304 1,039
East | Operating Segments | Energy revenue      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer 183 322 546
Derivative revenue 67 98 90
East | Operating Segments | Capacity revenue      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer 620 664 746
Derivative revenue 156 109 137
East | Operating Segments | Derivative revenue      
Disaggregation of Revenue [Line Items]      
Mark-to-market for economic hedging activities 88 (29) (35)
Derivative revenue 314 183 210
East | Operating Segments | Other revenue      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer 62 58 75
East | Operating Segments | Total operating revenues      
Disaggregation of Revenue [Line Items]      
Revenues 2,354 2,319 2,371
East | Operating Segments | Other derivative revenue      
Disaggregation of Revenue [Line Items]      
Derivative revenue 3 5 17
East | Corporate/Eliminations      
Disaggregation of Revenue [Line Items]      
Revenues 6 (8) 5
West/Other | Operating Segments      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer 379 354 703
Revenues 434 440 724
Less: Lease revenue 17 19 19
West/Other | Operating Segments | Retail Revenue | Mass customers      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer 0 0 0
West/Other | Operating Segments | Retail Revenue | Business Solutions customers      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer 0 0 0
West/Other | Operating Segments | Total retail revenue      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer 0 0 0
West/Other | Operating Segments | Energy revenue      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer 333 318 566
Derivative revenue 43 39 (2)
West/Other | Operating Segments | Capacity revenue      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer 61 36 79
Derivative revenue 0 0 0
West/Other | Operating Segments | Derivative revenue      
Disaggregation of Revenue [Line Items]      
Mark-to-market for economic hedging activities (3) 16 (5)
Derivative revenue 38 67 2
West/Other | Operating Segments | Other revenue      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer 43 70 84
West/Other | Operating Segments | Total operating revenues      
Disaggregation of Revenue [Line Items]      
Revenues 434 440 724
West/Other | Operating Segments | Other derivative revenue      
Disaggregation of Revenue [Line Items]      
Derivative revenue (2) 12 9
West/Other | Corporate/Eliminations      
Disaggregation of Revenue [Line Items]      
Revenues $ (4) $ 2 $ (4)