Annual report pursuant to Section 13 and 15(d)

PENSIONS AND OTHER POSTRETIREMENT BENEFITS - Weighted-Average Assumptions Used to Determine Net Benefit Cost (Details)

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PENSIONS AND OTHER POSTRETIREMENT BENEFITS - Weighted-Average Assumptions Used to Determine Net Benefit Cost (Details)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Obligation discount rate 5.47% 3.21% 2.32%
Service cost discount rate 5.61% 3.49% 2.78%
Interest cost discount rate 5.34% 2.75% 1.64%
Interest crediting rate 5.46% 5.39% 5.35%
Expected return on plan assets 7.66% 6.87% 6.84%
Compensation rate increase 3.00% 2.74% 2.54%
OPEB      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Obligation discount rate 5.52% 3.33% 2.46%
Service cost discount rate 5.65% 3.91% 3.28%
Interest cost discount rate 5.38% 3.01% 2.04%
Expected return on plan assets 5.87% 4.86% 5.20%
Compensation rate increase 3.00% 3.00% 3.00%