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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 6,673 $ 6,480 $ 15,162 $ 13,860
Mark-to-market for economic hedging activities (283) 875 48 1,347
Contract amortization     (226) (140)
Revenue 6,740 6,659 15,325 14,088
Less: Revenues accounted for under topics other than ASC 606 and ASC 815 30 31 95 47
Derivative revenue (269) 884 58 1,352
Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (22) (13) (43) (16)
Revenue (23) (13) (43) (19)
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 6,519 6,344 14,735 13,573
Derivative revenue 7 9 18 19
Retail revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (18) (8) (34) (8)
Derivative revenue 0 0 0 0
Energy revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 99 110 344 262
Derivative revenue 4 29 22 91
Energy revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 (3) (1) (6)
Derivative revenue 0 (2) 0 (5)
Capacity revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 61 44 108 86
Derivative revenue 16 19 32 41
Capacity revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 (1) (1) (2)
Derivative revenue 0 0 0 0
Derivative revenue        
Disaggregation of Revenue [Line Items]        
Mark-to-market for economic hedging activities (1) 84 (16) 24
Less: Realized and unrealized ASC 815 revenue 37 148 68 181
Derivative revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Mark-to-market for economic hedging activities (2) 2 0 2
Less: Realized and unrealized ASC 815 revenue (1) 0 0 (3)
Other revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 62 84 159 160
Contract amortization   (7) (5) (17)
Other revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (3) (3) (7) (5)
Contract amortization   0 0 0
Total operating revenue        
Disaggregation of Revenue [Line Items]        
Revenue 6,740 6,659 15,325 14,088
Total operating revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue (23) (13) (43) (19)
Other revenue, derivative        
Disaggregation of Revenue [Line Items]        
Derivative revenue 11 7 12 6
Other revenue, derivative | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Derivative revenue 1 0 0 0
Home | Retail revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 3,052 3,176 6,312 6,305
Home | Retail revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (18) (8) (34) (8)
Business | Retail revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 3,467 3,168 8,423 7,268
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 2,835 2,755 5,272 4,986
Revenue 2,847 2,763 5,282 4,996
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 (6) (9) (13) (10)
Texas | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 2,779 2,692 5,166 4,870
Derivative revenue 0 0 0 0
Texas | Energy revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 15 16 22 23
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 12 8 10 10
Texas | Other revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 53 55 94 103
Contract amortization   0 0 0
Texas | Total operating revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue 2,847 2,763 5,282 4,996
Texas | Other revenue, derivative | Operating Segments        
Disaggregation of Revenue [Line Items]        
Derivative revenue 12 8 10 10
Texas | Home | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 1,804 1,766 3,359 3,126
Texas | Business | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 975 926 1,807 1,744
East | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 2,704 2,412 7,218 5,893
Revenue 2,737 2,532 7,314 6,047
Less: Revenues accounted for under topics other than ASC 606 and ASC 815 0 12 37 22
East | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue (2) 0 (1) 0
East | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 2,608 2,361 6,958 5,789
Derivative revenue 7 9 18 19
East | Energy revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 64 46 222 127
Derivative revenue 8 15 22 58
East | Capacity revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 55 39 95 80
Derivative revenue 16 19 32 41
East | Derivative revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Mark-to-market for economic hedging activities 3 65 (16) 14
Less: Realized and unrealized ASC 815 revenue 33 108 59 132
East | Other revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 7 27 60 53
Contract amortization   (6) (5) (16)
East | Total operating revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue 2,737 2,532 7,314 6,047
East | Other revenue, derivative | Operating Segments        
Disaggregation of Revenue [Line Items]        
Derivative revenue (1) 0 3 0
East | Home | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 524 537 1,262 1,239
East | Business | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 2,084 1,824 5,696 4,550
West/Services/Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 652 859 1,717 2,062
Revenue 675 910 1,774 2,129
Less: Revenues accounted for under topics other than ASC 606 and ASC 815 30 19 58 25
West/Services/Other | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue (2) (4) (4) (9)
West/Services/Other | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 646 832 1,647 1,987
Derivative revenue 0 0 0 0
West/Services/Other | Energy revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 20 51 101 118
Derivative revenue (4) 16 0 38
West/Services/Other | Capacity revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 6 6 14 8
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 (2) 17 0 8
Less: Realized and unrealized ASC 815 revenue (7) 32 (1) 42
West/Services/Other | Other revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 5 5 12 9
Contract amortization   (1) 0 (1)
West/Services/Other | Total operating revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue 675 910 1,774 2,129
West/Services/Other | Other revenue, derivative | Operating Segments        
Disaggregation of Revenue [Line Items]        
Derivative revenue (1) (1) (1) (4)
West/Services/Other | Home | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 238 414 727 1,013
West/Services/Other | Business | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 408 418 920 974
Vivint Smart Home | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 504 467 998 935
Revenue 504 467 998 935
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 (13) 0 (25) 0
Vivint Smart Home | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 504 467 998 935
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
Vivint Smart Home | Total operating revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue 504 467 998 935
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 504 467 998 935
Vivint Smart Home | Business | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 0 $ 0 $ 0 $ 0