Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
Dec. 31, 2024 |
|
| Summary Of Significant Accounting Policies [Line Items] | |||||
| Receivables from contracts with customers | $ 330 | $ 330 | $ 219 | ||
| Unbilled revenues | 98 | 98 | $ 68 | ||
| Franchise fees and gross receipts taxes | $ 37 | $ 31 | $ 66 | $ 57 | |