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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 7,503 $ 7,127 $ 22,665 $ 20,987
Mark-to-market for economic hedging activities (376) (1,630) (328) (283)
Contract amortization     (363) (231)
Revenue 7,635 7,223 22,960 21,311
Less: Revenues accounted for under topics other than ASC 606 and ASC 815 35 27 130 74
Derivative revenue (379) (1,635) (321) (283)
Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (19) (9) (62) (25)
Revenue (21) (10) (64) (29)
Less: Revenues accounted for under topics other than ASC 606 and ASC 815 0 0 0 0
Retail revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 7,282 6,954 22,017 20,527
Derivative revenue 9 6 27 25
Retail revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (19) (4) (53) (12)
Derivative revenue 0 0 0 0
Energy revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 148 128 492 390
Derivative revenue 14 18 36 109
Energy revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 (3) (1) (9)
Derivative revenue (2) (3) (2) (8)
Capacity revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 87 47 195 133
Derivative revenue 16 17 48 58
Capacity revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 (1) (1) (3)
Derivative revenue 0 0 0 0
Derivative revenue        
Disaggregation of Revenue [Line Items]        
Mark-to-market for economic hedging activities 34 8 18 32
Less: Realized and unrealized ASC 815 revenue 97 69 165 250
Derivative revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Mark-to-market for economic hedging activities 0 1 0 3
Less: Realized and unrealized ASC 815 revenue (2) (1) (2) (4)
Other revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 83 94 242 254
Contract amortization 1 (8) (4) (25)
Other revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (2) (3) (9) (8)
Contract amortization 0 0 0 0
Total operating revenue        
Disaggregation of Revenue [Line Items]        
Revenue 7,635 7,223 22,960 21,311
Total operating revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue (21) (10) (64) (29)
Other revenue, derivative        
Disaggregation of Revenue [Line Items]        
Derivative revenue 24 20 36 26
Other revenue, derivative | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Derivative revenue 0 1 0 1
Home | Retail revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 3,613 3,695 9,925 10,000
Home | Retail revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (19) (4) (53) (12)
Business | Retail revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 3,669 3,259 12,092 10,527
Business | 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 3,356 3,282 8,628 8,268
Revenue 3,379 3,301 8,661 8,297
Less: Revenues accounted for under topics other than ASC 606 and ASC 815 0 0 0 0
Texas | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue (4) (5) (17) (15)
Texas | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 3,300 3,231 8,466 8,101
Derivative revenue 0 0 0 0
Texas | Energy revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 16 12 38 35
Derivative revenue 0 0 0 0
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 0 0 0
Less: Realized and unrealized ASC 815 revenue 23 19 33 29
Texas | Other revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 63 58 157 161
Contract amortization 0 0 0 0
Texas | Total operating revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue 3,379 3,301 8,661 8,297
Texas | Other revenue, derivative | Operating Segments        
Disaggregation of Revenue [Line Items]        
Derivative revenue 23 19 33 29
Texas | Home | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 2,265 2,235 5,624 5,361
Texas | Business | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 1,035 996 2,842 2,740
East | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 2,961 2,553 10,179 8,446
Revenue 3,030 2,600 10,344 8,647
Less: Revenues accounted for under topics other than ASC 606 and ASC 815 1 14 38 36
East | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue 0 0 (1) 0
East | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 2,766 2,468 9,724 8,257
Derivative revenue 9 6 27 25
East | Energy revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 132 67 354 194
Derivative revenue 16 9 38 67
East | Capacity revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 87 40 182 120
Derivative revenue 16 17 48 58
East | Derivative revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Mark-to-market for economic hedging activities 28 1 12 15
Less: Realized and unrealized ASC 815 revenue 68 33 127 165
East | Other revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 16 31 76 84
Contract amortization 1 (7) (4) (23)
East | Total operating revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue 3,030 2,600 10,344 8,647
East | Other revenue, derivative | Operating Segments        
Disaggregation of Revenue [Line Items]        
Derivative revenue (1) 0 2 0
East | Home | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 600 616 1,862 1,855
East | Business | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 2,166 1,852 7,862 6,402
West/Services/Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 673 802 2,390 2,864
Revenue 715 833 2,489 2,962
Less: Revenues accounted for under topics other than ASC 606 and ASC 815 34 13 92 38
West/Services/Other | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue (2) (5) (6) (14)
West/Services/Other | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 703 760 2,350 2,747
Derivative revenue 0 0 0 0
West/Services/Other | Energy revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 52 101 170
Derivative revenue 0 12 0 50
West/Services/Other | Capacity revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 8 14 16
Derivative revenue 0 0 0 0
West/Services/Other | Derivative revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Mark-to-market for economic hedging activities 6 6 6 14
Less: Realized and unrealized ASC 815 revenue 8 18 7 60
West/Services/Other | Other revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 6 8 18 17
Contract amortization 0 (1) 0 (2)
West/Services/Other | Total operating revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue 715 833 2,489 2,962
West/Services/Other | Other revenue, derivative | Operating Segments        
Disaggregation of Revenue [Line Items]        
Derivative revenue 2 0 1 (4)
West/Services/Other | Home | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 235 349 962 1,362
West/Services/Other | Business | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 468 411 1,388 1,385
Vivint Smart Home | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 532 499 1,530 1,434
Revenue 532 499 1,530 1,434
Less: Revenues accounted for under topics other than ASC 606 and ASC 815 0 0 0 0
Vivint Smart Home | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue (15) 0 (40) 0
Vivint Smart Home | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 532 499 1,530 1,434
Derivative revenue 0 0 0 0
Vivint Smart Home | Energy revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Derivative revenue 0 0 0 0
Vivint Smart Home | Capacity revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Derivative revenue 0 0 0 0
Vivint Smart Home | Derivative revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Mark-to-market for economic hedging activities 0 0 0 0
Less: Realized and unrealized ASC 815 revenue 0 0 0 0
Vivint Smart Home | Other revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Contract amortization 0 0 0 0
Vivint Smart Home | Total operating revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue 532 499 1,530 1,434
Vivint Smart Home | Other revenue, derivative | Operating Segments        
Disaggregation of Revenue [Line Items]        
Derivative revenue 0 0 0 0
Vivint Smart Home | Home | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 532 499 1,530 1,434
Vivint Smart Home | Business | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 0 $ 0 $ 0 $ 0