ÐÇ¿Õ´«Ã½

Annual report pursuant to Section 13 and 15(d)

PENSIONS AND OTHER POSTRETIREMENT BENEFITS - Multiemployer Plan (Details)

v3.20.4
PENSIONS AND OTHER POSTRETIREMENT BENEFITS - Multiemployer Plan (Details)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Multiemployer Plan [Line Items] Ìý Ìý Ìý
Contributions $ 30 $ 4 $ 4
Steelworkers Pension Trust Ìý Ìý Ìý
Multiemployer Plan [Line Items] Ìý Ìý Ìý
Pension Plan EIN 236648508 Ìý Ìý
Pension Plan Number 499 Ìý Ìý
Pension Protection Act Zone Status Green Green Ìý
FIP/RP Status Pending/Implemented No Ìý Ìý
Contributions $ 14 $ 4 $ 4
Surcharge Imposed No Ìý Ìý
Multiemployer Plan, Pension, Significant, Accumulated Benefit Obligation Ìý 5,748 Ìý
Multiemployer Plan, Pension, Significant, Plan Asset Ìý $ 5,372 Ìý
Multiemployer Plan, Pension, Significant, Funded Status Percentage Ìý 0.93 Ìý
Steelworkers Pension Trust | ArcelorMittal USA and AK Steel [Member] Ìý Ìý Ìý
Multiemployer Plan [Line Items] Ìý Ìý Ìý
Multiemployer Plan, Pension, Significant, Contribution, Percentage Ìý 0.30 0.30
Steelworkers Pension Trust | Other Companies Ìý Ìý Ìý
Multiemployer Plan [Line Items] Ìý Ìý Ìý
Multiemployer Plan, Pension, Significant, Contribution, Percentage Ìý 0.05 0.05
Steelworkers Pension Trust | Minimum [Member] Ìý Ìý Ìý
Multiemployer Plan [Line Items] Ìý Ìý Ìý
Expiration Date of Collective Bargaining Agreement Jan. 22, 2021 Ìý Ìý
Steelworkers Pension Trust | Maximum [Member] Ìý Ìý Ìý
Multiemployer Plan [Line Items] Ìý Ìý Ìý
Expiration Date of Collective Bargaining Agreement Oct. 01, 2022 Ìý Ìý
IAM National Pension Fund's National Pension Plan Ìý Ìý Ìý
Multiemployer Plan [Line Items] Ìý Ìý Ìý
Pension Plan EIN 516031295 Ìý Ìý
Pension Plan Number 002 Ìý Ìý
Pension Protection Act Zone Status Red Green Ìý
FIP/RP Status Pending/Implemented Implemented Ìý Ìý
Contributions $ 16 $ 0 $ 0
Surcharge Imposed Yes Ìý Ìý
IAM National Pension Fund's National Pension Plan | Minimum [Member] Ìý Ìý Ìý
Multiemployer Plan [Line Items] Ìý Ìý Ìý
Expiration Date of Collective Bargaining Agreement May 31, 2022 Ìý Ìý
IAM National Pension Fund's National Pension Plan | Maximum [Member] Ìý Ìý Ìý
Multiemployer Plan [Line Items] Ìý Ìý Ìý
Expiration Date of Collective Bargaining Agreement May 15, 2023 Ìý Ìý
American Maritime Officers Plan Ìý Ìý Ìý
Multiemployer Plan [Line Items] Ìý Ìý Ìý
Pension Plan EIN 131936709 Ìý Ìý
Pension Plan Number 001 Ìý Ìý
Pension Protection Act Zone Status Green Green Ìý
FIP/RP Status Pending/Implemented No Ìý Ìý
Contributions $ 0 $ 0 $ 0
Surcharge Imposed No Ìý Ìý
Expiration Date of Collective Bargaining Agreement Jul. 31, 2021 Ìý Ìý