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PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Tables) | 9 Months Ended
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Sep. 30, 2025
Postemployment Benefits [Abstract] |
Schedule of Net Benefit Costs | The following are the components of defined benefit pension and OPEB costs (credits): DEFINED BENEFIT PENSION COSTS (CREDITS)
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(In millions) | 2025 |  | 2024 |  | 2025 |  | 2024
Service cost | $ | 7 |  |  | $ | 7 |  |  | $ | 21 |  |  | $ | 21 |
Interest cost | 53 |  |  | 54 |  |  | 158 |  |  | 163 |
Expected return on plan assets | (79) |  |  | (80) |  |  | (238) |  |  | (240) |
Amortization: |  |  |  |  |  |  |
Prior service costs | 4 |  |  | 5 |  |  | 13 |  |  | 13 |
Net actuarial gain | (2) |  |  | — |  |  | (6) |  |  | — |
Net periodic benefit credits | $ | (17) |  |  | $ | (14) |  |  | $ | (52) |  |  | $ | (43) |
OPEB COSTS (CREDITS)
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(In millions) | 2025 |  | 2024 |  | 2025 |  | 2024
Service cost | $ | 2 |  |  | $ | 2 |  |  | $ | 6 |  |  | $ | 6 |
Interest cost | 14 |  |  | 13 |  |  | 43 |  |  | 38 |
Expected return on plan assets | (11) |  |  | (11) |  |  | (32) |  |  | (32) |
Termination benefits 1 | — |  |  | — |  |  | 15 |  |  | 2 |
Amortization: |  |  |  |  |  |  |
Prior service credits | (3) |  |  | (4) |  |  | (10) |  |  | (12) |
Net actuarial gain | (33) |  |  | (39) |  |  | (100) |  |  | (116) |
Net periodic benefit credits | $ | (31) |  |  | $ | (39) |  |  | $ | (78) |  |  | $ | (114) |
1 The termination benefits relate to the decision to indefinitely idle our Conshohocken, Riverdale and Steelton facilities in the second quarter of 2025 and the indefinite idle of our Weirton tinplate production facility in the first quarter of 2024.

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (q) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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