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PENSION AND OTHER POSTRETIREMENT BENEFITS - Schedule of Components of Net Periodic Cost (Benefit) and Amounts Recognized in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 5 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2025 | Aug. 06, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Other comprehensive income (loss): |  |  |  |
Deferred income taxes | $ 6 | $ 8 | $ 34 | $ 14
Recognized in other comprehensive income (loss), net of tax | 19 | 25 | 105 | 45
Discontinued operations |  |  |  |
Components of net periodic cost: |  |  |  |
Net periodic cost (benefit) |  |  |  | 7
Pension Benefits |  |  |  |
Components of net periodic cost: |  |  |  |
Service cost |  | 0 | 0 |
Interest cost | 79 | 120 | 198 | 207
Expected return on plan assets | (51) | (77) | (136) | (128)
Amortization of actuarial gains (losses) | 0 | 44 | 80 | 83
Net periodic cost (benefit) | 28 | 87 | 142 | 162
Other comprehensive income (loss): |  |  |  |
Actuarial (loss) gain | 29 | 0 | 57 | (22)
Amortization of actuarial gains (losses) | 0 | 44 | 80 | 83
Recognized in other comprehensive income (loss), before tax | 29 | 44 | 137 | 61
Deferred income taxes | (7) | (11) | (34) | (14)
Recognized in other comprehensive income (loss), net of tax | 22 | 33 | 103 | 47
Postretirement Benefits |  |  |  |
Components of net periodic cost: |  |  |  |
Service cost | 0 | 1 | 1 | 1
Interest cost | 4 | 5 | 10 | 12
Amortization of actuarial gains (losses) | 0 | (11) | (17) | (18)
Net periodic cost (benefit) | 4 | (5) | (6) | (5)
Other comprehensive income (loss): |  |  |  |
Actuarial (loss) gain | (1) | 0 | 14 | 11
Amortization of actuarial gains (losses) | 0 | (11) | (17) | (18)
Recognized in other comprehensive income (loss), before tax | (1) | (11) | (3) | (7)
Deferred income taxes | 0 | 3 | 1 | 2
Recognized in other comprehensive income (loss), net of tax | $ (1) | $ (8) | $ (2) | $ (5)

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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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