Business Segment Information - Summary of Business (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($) segment	Mar. 31, 2019 USD ($)
Business Segment Information
Number of Reportable Segments | segment	4
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Net sales	$ 2,785	$ 2,785
Reconciling items
Other	(10)	(15)
Business consolidation and other activities	(115)	(14)
Amortization of acquired Rexam intangibles	(45)	(48)
Earnings before interest and taxes	155	221
Interest expense	(71)	(77)
Debt refinancing and other costs	(40)	(4)
Total interest expense	(111)	(81)
Earnings before taxes	44	140
Undistributed corporate expenses	14	23
Depreciation and Amortization
Depreciation and amortization	169	170
Capital Expenditures
Capital expenditures	213	154
Operating Segments
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Net sales	2,687	2,584
Segment Reporting Information, Operating Income (Loss) [Abstract]
Reportable segment comparable operating earnings	317	290
Operating Segments | Beverage packaging, North And Central America
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Net sales	1,181	1,131
Segment Reporting Information, Operating Income (Loss) [Abstract]
Reportable segment comparable operating earnings	146	118
Reconciling items
Business consolidation and other activities	(3)	(1)
Operating Segments | Beverage packaging, South America
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Net sales	405	441
Segment Reporting Information, Operating Income (Loss) [Abstract]
Reportable segment comparable operating earnings	63	68
Reconciling items
Business consolidation and other activities	(1)	(1)
Operating Segments | Beverage packaging, EMEA
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Net sales	669	684
Segment Reporting Information, Operating Income (Loss) [Abstract]
Reportable segment comparable operating earnings	68	74
Reconciling items
Business consolidation and other activities	(3)	1
Operating Segments | Aerospace
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Net sales	432	328
Segment Reporting Information, Operating Income (Loss) [Abstract]
Reportable segment comparable operating earnings	40	30
Other
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Net sales	98	201
Reconciling items
Business consolidation and other activities	(108)	(13)
Rexam
Reconciling items
Amortization of acquired Rexam intangibles	$ (37)	$ (40)