Pension Plans and Postretirement Benefits - Weighted Average Assumptions (Detail) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
|
| Pension Plan | |||
| Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] | |||
| Discount rate | 5.07% | 5.42% | |
| Discount rate to determine interest cost | 5.26% | 2.42% | 1.96% |
| Expected return on plan assets | 7.13% | 7.10% | 6.80% |
| Other Benefits | |||
| Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] | |||
| Discount rate | 4.92% | 5.32% | |
| Discount rate to determine interest cost | 5.23% | 2.42% | 1.87% |
| Expected return on plan assets | 5.67% | 5.67% | 5.66% |