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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 7,127 $ 7,861 $ 20,987 $ 21,592
Mark-to-market for economic hedging activities (1,630) (53) (283) (1,933)
Contract amortization     (231) (108)
Revenue 7,223 7,946 21,311 22,016
Less: Revenues accounted for under topics other than ASC 606 and ASC 815 27 18 74 39
Derivative revenue (1,635) (54) (283) (1,909)
Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (9) (5) (25) (11)
Revenue (10) (5) (29) (21)
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 6,954 7,521 20,527 20,911
Derivative revenue 6 14 25 57
Retail revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (4) (1) (12) (1)
Derivative revenue 0 0 0 0
Energy revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 128 261 390 472
Derivative revenue 18 77 109 148
Energy revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (3) (1) (9) 0
Derivative revenue (3) 0 (8) 1
Capacity revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 47 59 133 150
Derivative revenue 17 27 58 50
Capacity revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (1) (1) (3) (1)
Derivative revenue 0 0 0 0
Derivative revenue        
Disaggregation of Revenue [Line Items]        
Mark-to-market for economic hedging activities 8 (70) 32 96
Less: Realized and unrealized ASC 815 revenue 69 67 250 385
Derivative revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Mark-to-market for economic hedging activities 1 0 3 (11)
Less: Realized and unrealized ASC 815 revenue (1) 0 (4) (10)
Other revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 94 180 254 411
Contract amortization (8) (5) (25) (24)
Other revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (3) (2) (8) (8)
Contract amortization 0 0 0 0
Total operating revenue        
Disaggregation of Revenue [Line Items]        
Revenue 7,223 7,946 21,311 22,016
Total operating revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue (10) (5) (29) (21)
Other revenue, derivative        
Disaggregation of Revenue [Line Items]        
Derivative revenue 20 19 26 34
Other revenue, derivative | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Derivative revenue 1 0 1 0
Home | Retail revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 3,695 3,808 10,000 9,327
Home | Retail revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (4) (1) (12) (1)
Business | Retail revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 3,259 3,713 10,527 11,584
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 3,282 3,670 8,268 8,207
Revenue 3,301 3,686 8,297 8,235
Less: Revenues accounted for under topics other than ASC 606 and ASC 815 0 0 0 0
Texas | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 3,231 3,489 8,101 7,842
Derivative revenue 0 0 0 0
Texas | Energy revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 12 51 35 71
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 19 16 29 28
Texas | Other revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 58 146 161 322
Contract amortization 0 0 0 0
Texas | Total operating revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue 3,301 3,686 8,297 8,235
Texas | Other revenue, derivative | Operating Segments        
Disaggregation of Revenue [Line Items]        
Derivative revenue 19 16 29 28
Texas | Home | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 2,235 2,397 5,361 5,196
Texas | Business | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 996 1,092 2,740 2,646
East | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 2,553 2,743 8,446 9,205
Revenue 2,600 2,809 8,647 9,488
Less: Revenues accounted for under topics other than ASC 606 and ASC 815 14 8 36 13
East | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 2,468 2,633 8,257 9,007
Derivative revenue 6 14 25 57
East | Energy revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 67 152 194 254
Derivative revenue 9 77 67 137
East | Capacity revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 40 64 120 154
Derivative revenue 17 27 58 50
East | Derivative revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Mark-to-market for economic hedging activities 1 (60) 15 27
Less: Realized and unrealized ASC 815 revenue 33 58 165 270
East | Other revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 31 26 84 70
Contract amortization (7) (6) (23) (24)
East | Total operating revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue 2,600 2,809 8,647 9,488
East | Other revenue, derivative | Operating Segments        
Disaggregation of Revenue [Line Items]        
Derivative revenue 0 0 0 (1)
East | Home | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 616 544 1,855 1,641
East | Business | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 1,852 2,089 6,402 7,366
West/Services/Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 802 975 2,864 3,121
Revenue 833 978 2,962 3,244
Less: Revenues accounted for under topics other than ASC 606 and ASC 815 13 10 38 26
West/Services/Other | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 760 922 2,747 2,993
Derivative revenue 0 0 0 0
West/Services/Other | Energy revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 52 59 170 147
Derivative revenue 12 0 50 10
West/Services/Other | Capacity revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 8 (4) 16 (3)
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 (10) 14 80
Less: Realized and unrealized ASC 815 revenue 18 (7) 60 97
West/Services/Other | Other revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 8 10 17 27
Contract amortization (1) 1 (2) 0
West/Services/Other | Total operating revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue 833 978 2,962 3,244
West/Services/Other | Other revenue, derivative | Operating Segments        
Disaggregation of Revenue [Line Items]        
Derivative revenue 0 3 (4) 7
West/Services/Other | Home | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 349 390 1,362 1,421
West/Services/Other | Business | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 411 532 1,385 1,572
Vivint Smart Home | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 499 478 1,434 1,070
Revenue 499 478 1,434 1,070
Less: Revenues accounted for under topics other than ASC 606 and ASC 815 0 0 0 0
Vivint Smart Home | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 499 478 1,434 1,070
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 499 478 1,434 1,070
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 499 478 1,434 1,070
Vivint Smart Home | Business | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 0 $ 0 $ 0 $ 0