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Business Consolidation and Other Activities (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Oct. 31, 2019	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019
Business consolidation and other activities
Business consolidation and other activities		$ (115)		$ (14)
Individually insignificant activities		13
Gain related to indirect tax contingencies			$ 57
Reversal of previously recorded expenses related to facilities closure		11
Beverage packaging China
Business consolidation and other activities
Charges related to facilities closure				13
Beverage packaging China \| Disposal Group, Disposed of by Sale, Not Discontinued Operations
Business consolidation and other activities
Loss on sale of disposal group		23
US steel food and steel aerosol packaging
Business consolidation and other activities
Impairment of assets held for sale		15
Steel Aerosol Packaging Business In Argentina [Member] \| Disposal Group, Disposed of by Sale, Not Discontinued Operations
Business consolidation and other activities
Loss on sale of disposal group	$ (52)
Charge in earnings for translation losses	$ 45
Rexam
Business consolidation and other activities
Acquisition costs		6
Operating Segments \| Beverage packaging, North And Central America
Business consolidation and other activities
Business consolidation and other activities		(3)		(1)
Charges related to facilities closure		3
Individually insignificant activities				1
Operating Segments \| Beverage packaging, South America
Business consolidation and other activities
Business consolidation and other activities		(1)		(1)
Individually insignificant activities		1		1
Operating Segments \| Beverage packaging, EMEA
Business consolidation and other activities
Business consolidation and other activities		(3)		1
Charges related to facilities closure		3
Individually insignificant activities				1
Operating Segments \| Beverage packaging, EMEA \| Recklinghausen, Germany facility \| Employee Severance And Benefits
Business consolidation and other activities
Charges related to facilities closure				2
Other
Business consolidation and other activities
Business consolidation and other activities		(108)		$ (13)
Impairment of goodwill		$ 62