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Business Consolidation and Other Activities (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended		12 Months Ended
	Jul. 31, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Business consolidation and other activities
Business consolidation and other activities		$ (32)	$ (157)	$ (131)	$ (253)
Gain (Loss) on sale of disposal group	$ 38
Settlement loss				14		$ 41
Employee Severance and Benefits, Accelerated Depreciation and Inventory Impairment
Business consolidation and other activities
Charges related to manufacturing cost rationalization				4
Beverage packaging, North And Central America
Business consolidation and other activities
Individually insignificant activities		(5)	1	10	5
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, North And Central America \| Reidsville North Carolina Plant \| Employee Severance And Benefits Facility Shutdown Costs Asset Impairment Accelerated Depreciation And Other Costs
Business consolidation and other activities
Charges related to facilities closure					7
Beverage packaging, North And Central America \| Birmingham, Alabama, Chatsworth, California And Longview, Texas \| Facility Closing
Business consolidation and other activities
Reversal of previously recorded expenses related to facilities closure				5
Beverage packaging, North And Central America \| Birmingham, Alabama, Chatsworth, California And Longview, Texas \| Employee Severance And Benefits
Business consolidation and other activities
Charges related to facilities closure			29
Beverage packaging, North And Central America \| Birmingham, Alabama, Chatsworth, California And Longview, Texas \| Facility Shutdown Costs Asset Impairment Accelerated Depreciation And Other Costs
Business consolidation and other activities
Charges related to facilities closure			4
Beverage packaging, North And Central America \| Birmingham, Alabama, Chatsworth, California And Longview, Texas \| Employee Severance And Benefits Facility Shutdown Costs Asset Impairment Accelerated Depreciation And Other Costs
Business consolidation and other activities
Charges related to facilities closure		9
Beverage packaging, South America
Business consolidation and other activities
Individually insignificant activities		4	4	5	4
Gain related to indirect tax contingencies in Brazil		16
Beverage packaging, Europe
Business consolidation and other activities
Individually insignificant activities		1		2	5
Beverage packaging, Europe \| Rexam
Business consolidation and other activities
Professional services and other costs					2
Beverage packaging, Europe \| Recklinghausen, Germany \| Employee Severance And Benefits
Business consolidation and other activities
Charges related to facilities closure			55
Beverage packaging, Europe \| Recklinghausen, Germany \| Facility Shutdown Costs Asset Impairment Accelerated Depreciation And Other Costs
Business consolidation and other activities
Charges related to facilities closure			7
Beverage packaging, Europe \| Recklinghausen, Germany \| Employee Benefits Severance Facility Shutdown Costs And Other Costs
Business consolidation and other activities
Charges related to facilities closure		2		15
Operating Segments \| Beverage packaging, North And Central America
Business consolidation and other activities
Business consolidation and other activities		(14)	(34)	(16)	(45)
Operating Segments \| Beverage packaging, South America
Business consolidation and other activities
Business consolidation and other activities		12	(4)	11	(4)
Operating Segments \| Beverage packaging, Europe
Business consolidation and other activities
Business consolidation and other activities		(3)	(62)	(17)	(69)
Other
Business consolidation and other activities
Business consolidation and other activities		(27)	(57)	(109)	(135)
Individually insignificant activities		6	11	24	21
Settlement loss		14	41	14	41
Other \| Rexam
Business consolidation and other activities
Professional services and other costs					12
Compensation arrangement expense		4	5	19	22
Other \| Weirton West Virginia Plant \| Facility Shutdown Costs And Accelerated Depreciation
Business consolidation and other activities
Charges related to facilities closure					6
US steel food and steel aerosol packaging \| Other \| Disposal Group, Disposed of by Sale, Not Discontinued Operations
Business consolidation and other activities
Professional services and other costs		6		10
Gain (Loss) on sale of disposal group				38
Adjustment to gain on sale of Divestment Business		(3)
Food and aerosol packaging paint and general line can plant \| Other \| Hubbard Ohio Plant \| Disposal Group, Disposed of by Sale, Not Discontinued Operations
Business consolidation and other activities
Gain (Loss) on sale of disposal group					15
Divestment Business \| Other \| Disposal Group, Disposed of by Sale, Not Discontinued Operations
Business consolidation and other activities
Expense of indemnifications of uncertain tax positions					34
Adjustment to gain on sale of Divestment Business					(14)
Ball Corporation
Business consolidation and other activities
Business consolidation and other activities		$ (53)	$ (18)	$ (70)	$ (82)