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Business Consolidation and Other Activities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2017
Business consolidation and other activities
Business consolidation and other activities	$ (30)	$ (55)
Beverage packaging, North And Central America
Business consolidation and other activities
Charges related to facilities closure	5
Charges for insignificant items	6	1
Beverage packaging, North And Central America \| Facility Shutdown Costs And Accelerated Depreciation
Business consolidation and other activities
Charges related to facilities closure		3
Beverage packaging, North And Central America \| Reidsville North Carolina Plant \| Facility Closing
Business consolidation and other activities
Charges related to facilities closure	2
Beverage packaging, South America
Business consolidation and other activities
Charges for insignificant items		3
Beverage packaging, Europe
Business consolidation and other activities
Business consolidation and other activities		2
Charges for insignificant items			$ 1
Beverage packaging, Europe \| Employee Severance And Benefits
Business consolidation and other activities
Charges related to facilities closure	4
Beverage packaging, Europe \| Facility Shutdown Costs Asset Impairment Accelerated Depreciation And Other Costs
Business consolidation and other activities
Charges related to facilities closure	6
Food and aerosol packaging
Business consolidation and other activities
Charges for insignificant items		2
Food and aerosol packaging \| Facility Shutdown Costs And Accelerated Depreciation
Business consolidation and other activities
Charges related to facilities closure		3
Food and aerosol packaging \| Disposal Group, Disposed of by Sale, Not Discontinued Operations
Business consolidation and other activities
Gain (loss) on dispositions		15
Operating Segments \| Beverage packaging, North And Central America
Business consolidation and other activities
Business consolidation and other activities	(3)	(4)
Operating Segments \| Beverage packaging, South America
Business consolidation and other activities
Business consolidation and other activities		3
Operating Segments \| Beverage packaging, Europe
Business consolidation and other activities
Business consolidation and other activities	(10)	(3)
Operating Segments \| Food and aerosol packaging
Business consolidation and other activities
Business consolidation and other activities		10
Corporate and Other
Business consolidation and other activities
Business consolidation and other activities	(17)	(61)
Charges for insignificant items	6	6
Corporate and Other \| Rexam
Business consolidation and other activities
Professional services and other costs		5
Compensation arrangement expense		9
Corporate and Other \| Beverage packaging, Europe \| Rexam
Business consolidation and other activities
Compensation arrangement expense	11
Divestment Business \| Corporate and Other \| Disposal Group, Disposed of by Sale, Not Discontinued Operations
Business consolidation and other activities
Expense of indemnifications of uncertain tax positions		27
Adjustment to gain on sale of Divestment Business		(14)
Ball Corporation
Business consolidation and other activities
Business consolidation and other activities	$ (13)	$ (51)