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Business Consolidation and Other Activities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Sep. 30, 2020	Mar. 31, 2020
Business consolidation and other activities
Business consolidation and other activities	$ (7)		$ (115)
Individually insignificant activities			13
Gain related to indirect tax contingencies		$ 4
Reversal of previously recorded expenses related to facilities closure			11
Beverage packaging China \| Disposal Group, Disposed of by Sale, Not Discontinued Operations
Business consolidation and other activities
Loss on sale of disposal group			23
Rexam
Business consolidation and other activities
Acquisition costs			6
Beverage packaging, South America
Business consolidation and other activities
Individually insignificant activities			1
Operating Segments \| Beverage packaging, North And Central America
Business consolidation and other activities
Business consolidation and other activities	1		(3)
Charges related to facilities closure			3
Individually insignificant activities	(1)
Operating Segments \| Beverage packaging, EMEA
Business consolidation and other activities
Business consolidation and other activities	(2)		(3)
Charges related to facilities closure	2
Operating Segments \| Beverage packaging, EMEA \| Recklinghausen, Germany facility \| Employee Severance And Benefits
Business consolidation and other activities
Charges related to facilities closure			3
Operating Segments \| Beverage packaging, South America
Business consolidation and other activities
Business consolidation and other activities	(1)		(1)
Individually insignificant activities	1
Other
Business consolidation and other activities
Business consolidation and other activities	(5)		(108)
Individually insignificant activities	$ 5
Impairment of goodwill			62
Other \| US steel food and steel aerosol packaging
Business consolidation and other activities
Impairment of assets held for sale			$ 15