Business Segment Information - Summary of Business (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) segment	Sep. 30, 2022 USD ($)
Business Segment Information
Number of reportable segments | segment			4
Net sales
Net sales	$ 3,571	$ 3,951	$ 10,626	$ 11,801
Reconciling items
Other		(8)	7	(26)
Business consolidation and other activities	(47)	163	(61)	(23)
Amortization of acquired intangibles	(40)	(40)	(119)	(124)
Earnings (loss) before interest and taxes	325	523	973	1,026
Interest expense	(122)	(79)	(350)	(216)
Debt refinancing and other costs				(2)
Total interest expense	(122)	(79)	(350)	(218)
Earnings (loss) before taxes	203	444	623	808
Undistributed corporate expenses	18	25	60	73
Operating segments
Net sales
Net sales	3,392	3,774	10,049	11,255
Comparable operating earnings
Reportable segment comparable operating earnings	406	401	1,129	1,177
Operating segments | Beverage packaging, North And Central America
Net sales
Net sales	1,541	1,800	4,582	5,184
Comparable operating earnings
Reportable segment comparable operating earnings	196	205	554	543
Reconciling items
Business consolidation and other activities	(10)	(36)	(27)	(37)
Operating segments | Beverage packaging, EMEA
Net sales
Net sales	902	1,031	2,656	3,106
Comparable operating earnings
Reportable segment comparable operating earnings	103	82	274	311
Reconciling items
Business consolidation and other activities	1	214	6	(225)
Operating segments | Beverage packaging, South America
Net sales
Net sales	489	466	1,344	1,494
Comparable operating earnings
Reportable segment comparable operating earnings	61	67	141	197
Reconciling items
Business consolidation and other activities	(6)	(9)	(7)	(31)
Operating segments | Aerospace
Net sales
Net sales	460	477	1,467	1,471
Comparable operating earnings
Reportable segment comparable operating earnings	46	47	160	126
Other.
Net sales
Net sales	179	177	577	546
Reconciling items
Business consolidation and other activities	(32)	(6)	(33)	270
Rexam
Reconciling items
Amortization of acquired intangibles	$ (34)	$ (33)	$ (102)	$ (102)