Revenue - Schedule of Components of Operating Revenues (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Disaggregation of Revenue [Line Items] | ||||
| Total revenue from contracts with customers | $ 1,663 | $ 697 | $ 4,125 | $ 1,760 |
| Realized and unrealized gain (loss) on derivative instruments | (336) | 115 | (922) | 65 |
| Other revenue | 0 | 0 | 0 | 7 |
| Operating revenues | 1,327 | 812 | 3,203 | 1,832 |
| Electricity sales and ancillary services, ISO/RTO | ||||
| Disaggregation of Revenue [Line Items] | ||||
| Total revenue from contracts with customers | 1,284 | 496 | 3,246 | 1,385 |
| Capacity revenues | ||||
| Disaggregation of Revenue [Line Items] | ||||
| Total revenue from contracts with customers | 323 | 166 | 767 | 303 |
| Operating revenues | 323 | 166 | 767 | 303 |
| Physical electricity sales, bilateral contracts, other | ||||
| Disaggregation of Revenue [Line Items] | ||||
| Total revenue from contracts with customers | $ 56 | $ 35 | $ 112 | $ 72 |
| X | ||||||||||
- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of revenue and income classified as other. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|