Income Taxes - MEC - Narrative (Details) - USD ($) $ in Millions |
6 Months Ended | ||
|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
|
| Schedule of Effective Income Tax Rate Reconciliation [Line Items] | |||
| Related party transaction, cash received (paid) for income taxes | $ 1,393 | $ 803 | |
| Years eligible for federal renewable energy production tax credit | 10 years | ||
| MEC | |||
| Schedule of Effective Income Tax Rate Reconciliation [Line Items] | |||
| Related party transaction, cash received (paid) for income taxes | $ 557 | $ 472 | |
| Years eligible for federal renewable energy production tax credit | 10 years | ||
| MEC | Related party | |||
| Schedule of Effective Income Tax Rate Reconciliation [Line Items] | |||
| Current income tax receivable (payable), related parties | $ (37) | $ 79 | |