Pension and Other Postretirement Benefits - Narrative (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Retirement Benefits [Abstract] | ||||
| Contributions and payments | $ 18 | $ 17 | $ 19 | $ 22 |