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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 7,861 $ 8,359 $ 21,592 $ 23,825
Mark-to-market for economic hedging activities (53) (89) (1,933) 2,907
Revenue 7,946 8,510 22,016 23,688
Less: Revenues accounted for under topics other than ASC 606 and ASC 815 18 16 39 22
Derivative revenue (54) (80) (1,909) 2,900
Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (5) (1) (11) (11)
Revenue (5) 12 (21) 29
Less: Revenues accounted for under topics other than ASC 606 and ASC 815 0 (1) 0 (1)
Retail revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 7,521 7,858 20,911 22,379
Derivative revenue 14 90 57 90
Retail revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (1) 0 (1) (1)
Derivative revenue 0 0 0 0
Energy revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 261 450 472 1,034
Derivative revenue 77 (1) 148 (2)
Energy revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (1) 10 0 24
Derivative revenue 0 11 1 24
Capacity revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 59 38 150 244
Derivative revenue 27 7 50 29
Capacity revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (1) 0 (1) 0
Derivative revenue 0 0 0 0
Derivative revenue        
Disaggregation of Revenue [Line Items]        
Mark-to-market for economic hedging activities (70) 33 96 (248)
Less: Realized and unrealized ASC 815 revenue 67 135 385 (159)
Derivative revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Mark-to-market for economic hedging activities 0 4 (11) 18
Less: Realized and unrealized ASC 815 revenue 0 14 (10) 41
Other revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 180 137 411 307
Contract amortization (5) (6) (24) (28)
Other revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (2) (2) (8) (12)
Contract amortization 0 0 0 0
Total operating revenue        
Disaggregation of Revenue [Line Items]        
Revenue 7,946 8,510 22,016 23,688
Total operating revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue (5) 12 (21) 29
Other revenue, derivative        
Disaggregation of Revenue [Line Items]        
Derivative revenue 19 6 34 (28)
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 3,808 3,033 9,327 8,212
Home | Retail revenue | Corporate/Eliminations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (1) 0 (1) (1)
Business | Retail revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 3,713 4,825 11,584 14,167
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 3,670 3,130 8,207 7,862
Revenue 3,686 3,145 8,235 7,857
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 3,489 2,999 7,842 7,510
Derivative revenue 0 0 0 0
Texas | Energy revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 51 48 71 101
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 4 0 1
Less: Realized and unrealized ASC 815 revenue 16 15 28 (5)
Texas | Other revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 146 94 322 245
Contract amortization 0 0 0 0
Texas | Total operating revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue 3,686 3,145 8,235 7,857
Texas | Other revenue, derivative | Operating Segments        
Disaggregation of Revenue [Line Items]        
Derivative revenue 16 11 28 (6)
Texas | Home | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 2,397 2,068 5,196 5,006
Texas | Business | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 1,092 931 2,646 2,504
East | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 2,743 4,082 9,205 12,513
Revenue 2,809 4,178 9,488 12,407
Less: Revenues accounted for under topics other than ASC 606 and ASC 815 8 3 13 (10)
East | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 2,633 3,863 9,007 11,784
Derivative revenue 14 90 57 90
East | Energy revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 152 212 254 544
Derivative revenue 77 (39) 137 (13)
East | Capacity revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 64 38 154 242
Derivative revenue 27 7 50 29
East | Derivative revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Mark-to-market for economic hedging activities (60) 32 27 (204)
Less: Realized and unrealized ASC 815 revenue 58 93 270 (96)
East | Other revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 26 43 70 71
Contract amortization (6) (10) (24) (30)
East | Total operating revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue 2,809 4,178 9,488 12,407
East | Other revenue, derivative | Operating Segments        
Disaggregation of Revenue [Line Items]        
Derivative revenue 0 3 (1) 2
East | Home | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 544 530 1,641 1,526
East | Business | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 2,089 3,333 7,366 10,258
West/Services/Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 975 1,148 3,121 3,461
Revenue 978 1,175 3,244 3,395
Less: Revenues accounted for under topics other than ASC 606 and ASC 815 10 14 26 33
West/Services/Other | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 922 996 2,993 3,086
Derivative revenue 0 0 0 0
West/Services/Other | Energy revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 59 180 147 365
Derivative revenue 0 27 10 (13)
West/Services/Other | Capacity revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (4) 0 (3) 2
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 (10) (7) 80 (63)
Less: Realized and unrealized ASC 815 revenue (7) 13 97 (99)
West/Services/Other | Other revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 10 2 27 3
Contract amortization 1 4 0 2
West/Services/Other | Total operating revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue 978 1,175 3,244 3,395
West/Services/Other | Other revenue, derivative | Operating Segments        
Disaggregation of Revenue [Line Items]        
Derivative revenue 3 (7) 7 (23)
West/Services/Other | Home | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 390 435 1,421 1,681
West/Services/Other | Business | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 532 $ 561 1,572 $ 1,405
Vivint Smart Home | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 478   1,070  
Revenue 478   1,070  
Less: Revenues accounted for under topics other than ASC 606 and ASC 815 0   0  
Vivint Smart Home | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 478   1,070  
Derivative revenue 0   0  
Vivint Smart Home | Energy revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0   0  
Derivative revenue 0   0  
Vivint Smart Home | Capacity revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0   0  
Derivative revenue 0   0  
Vivint Smart Home | Derivative revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Mark-to-market for economic hedging activities 0   0  
Less: Realized and unrealized ASC 815 revenue 0   0  
Vivint Smart Home | Other revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0   0  
Contract amortization 0   0  
Vivint Smart Home | Total operating revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue 478   1,070  
Vivint Smart Home | Other revenue, derivative | Operating Segments        
Disaggregation of Revenue [Line Items]        
Derivative revenue 0   0  
Vivint Smart Home | Home | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 478   1,070  
Vivint Smart Home | Business | Retail revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 0   $ 0