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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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