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Restructuring - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 5 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Apr. 30, 2025
Restructuring Cost and Reserve [Line Items] |  |  |  |
Net charges to earnings | $ 45 | $ 6 |  |
Restructuring and related cost | 53 | 6 |  |
Payment for restructuring | 30 |  |  |
Employee Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Payment for restructuring | 26 |  |  |
Fixed Asset Related Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Payment for restructuring | 0 |  |  |
Other Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Payment for restructuring | 4 |  |  |
Berry Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Net charges to earnings | 40 | $ 0 |  |
Restructuring and related cost, expected cost | 165 |  | $ 165 | $ 280
Business combination, integration-related cost, expected expense |  |  | 90 |
Payment for restructuring | 1 |  | 4 |
Business Combination, Integration-Related Cost, Expense |  |  | 41 |
Berry Plan | Minimum |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Expected cash payments for the Restructuring and Integration | 100 |  | 100 |
Expected cash payments for restructuring | 80 |  | 80 |
Berry Plan | Maximum |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Expected cash payments for the Restructuring and Integration | 120 |  | 120 |
Expected cash payments for restructuring | 90 |  | 90 |
Berry Plan | Global Flexible Packaging Solutions |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost | 9 |  | 23 |
Berry Plan | Global Rigid Packaging Solutions |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost | 28 |  | 28 |
Berry Plan | Corporate Segment |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost | 3 |  | 3 |
Berry Plan | Employee Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost | 94 |  | 94 |
Restructuring and related cost | 48 |  | 62 |
Berry Plan | Fixed Asset Related Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost | 13 |  | 13 |
Restructuring and related cost | 13 |  | 13 |
Berry Plan | Other Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost | 33 |  | 33 |
Restructuring and related cost | 3 |  |  |
Berry Plan | Restructuring related |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related cost, expected cost | 25 |  | 25 |
Restructuring and related cost | 2 |  | $ 2 |
Payment for restructuring | $ 190 |  |  |

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- Definition Amount of expense for integration-related cost incurred in connection with business combination. Includes system integration and conversion costs; severance and other employee-related costs; restructuring and other post-combination costs. Excludes acquisition-related cost incurred to effect business combination; cost to issue debt or equity securities; and cost related to acquisition of asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479328/805-10-50-7 + Details
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