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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Pension Plan [Member] Ìý Ìý Ìý
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Ìý Ìý Ìý
Obligation discount rate 3.02% 4.27% 3.58%
Service cost discount rate 3.34% 4.35% 3.64%
Interest cost discount rate 2.53% 3.92% 3.16%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Weighted-Average Interest Crediting Rate 5.50% 6.00% 6.00%
Interest crediting rate 5.25% 6.00% Ìý
Expected return on plan assets 7.69% 8.25% 8.25%
Rate of compensation increase 2.56% 2.53% 2.49%
Other Postretirement Benefits Plan [Member] Ìý Ìý Ìý
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Ìý Ìý Ìý
Obligation discount rate 3.28% 4.29% 3.60%
Service cost discount rate 3.35% 4.49% 3.73%
Interest cost discount rate 2.51% 3.94% 3.11%
Expected return on plan assets 6.82% 7.00% 7.00%
Rate of compensation increase 3.00% 3.00% 3.00%