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Restructuring - Restructuring Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended | 15 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Jun. 30, 2023 | Sep. 30, 2023
Restructuring Cost and Reserve [Line Items] |  |  |  |
Net charges to earnings | $ 28 |  | $ 111 | $ 139
Net charges to earnings | 25 | $ 1 |  |
Employee Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Net charges to earnings | 16 | 1 |  |
Fixed Asset Related Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Net charges to earnings | 6 | 0 |  |
Other Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Net charges to earnings | 3 | $ 0 |  |
2023 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Net charges to earnings | 26 |  | 94 | 120
Restructuring Related Costs | 3 |  | 6 |
2023 Restructuring Plan | Flexibles |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Net charges to earnings | 23 |  |  |
2023 Restructuring Plan | Rigid Packaging |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Net charges to earnings | 3 |  |  |
Other Restructuring Plans |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Net charges to earnings | 2 |  | 17 | $ 19
Restructuring Related Costs | $ 0 |  | $ 4 |

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