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Revenue - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Retail | Minimum |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers, payment terms, number of days due from invoice date | 15 days |  |
Retail | Maximum |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers, payment terms, number of days due from invoice date | 60 days |  |
Texas, East, West and Sunset Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers, payment terms, number of days due from invoice date | 10 days |  |
Revenue, remaining performance obligation, expected timing of satisfaction, start date [Axis]: 2024-01-01 |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue, remaining performance obligation, amount | $ 480 |  |
Revenue, remaining performance obligation, expected timing of satisfaction, period | 1 year |  |
Revenue, remaining performance obligation, expected timing of satisfaction, start date [Axis]: 2025-01-01 |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue, remaining performance obligation, amount | $ 417 |  |
Revenue, remaining performance obligation, expected timing of satisfaction, period | 1 year |  |
Revenue, remaining performance obligation, expected timing of satisfaction, start date [Axis]: 2026-01-01 |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue, remaining performance obligation, amount | $ 282 |  |
Revenue, remaining performance obligation, expected timing of satisfaction, period | 1 year |  |
Revenue, remaining performance obligation, expected timing of satisfaction, start date [Axis]: 2027-01-01 |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue, remaining performance obligation, amount | $ 100 |  |
Revenue, remaining performance obligation, expected timing of satisfaction, period | 1 year |  |
Revenue, remaining performance obligation, expected timing of satisfaction, start date [Axis]: 2028-01-01 |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue, remaining performance obligation, amount | $ 62 |  |
Revenue, remaining performance obligation, expected timing of satisfaction, period | 1 year |  |
Revenue, remaining performance obligation, expected timing of satisfaction, start date [Axis]: 2029-01-01 |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue, remaining performance obligation, amount | $ 610 |  |
Revenue, remaining performance obligation, expected timing of satisfaction, period |  |  |
Selling, General and Administrative Expenses |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Capitalized contract cost, amortization | $ 88 | $ 83 | $ 75
Operating revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Capitalized contract cost, amortization | 6 | 6 | $ 6
Costs to Acquire Residential and Business Retail Customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Capitalized contract cost, net | $ 97 | $ 89 |

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