Business Segment Information - Summary of Business (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) segment	Jun. 30, 2022 USD ($)
Business Segment Information
Number of reportable segments | segment			4
Net sales
Net sales	$ 3,566	$ 4,134	$ 7,055	$ 7,850
Reconciling items
Other	(8)	11	7	(18)
Business consolidation and other activities	6	(467)	(14)	(186)
Amortization of acquired intangibles	(40)	(39)	(79)	(84)
Earnings (loss) before interest and taxes	321	(107)	648	503
Interest expense	(115)	(68)	(228)	(137)
Debt refinancing and other costs		(2)		(2)
Total interest expense	(115)	(70)	(228)	(139)
Earnings (loss) before taxes	206	(177)	420	364
Undistributed corporate expenses	32	15	42	48
Operating segments
Net sales
Net sales	3,361	3,932	6,657	7,481
Comparable operating earnings
Reportable segment comparable operating earnings	357	381	723	776
Operating segments | Beverage packaging, North And Central America
Net sales
Net sales	1,537	1,775	3,041	3,384
Comparable operating earnings
Reportable segment comparable operating earnings	175	164	358	338
Reconciling items
Business consolidation and other activities	5	(2)	(17)	(1)
Operating segments | Beverage packaging, EMEA
Net sales
Net sales	920	1,133	1,754	2,075
Comparable operating earnings
Reportable segment comparable operating earnings	98	129	171	229
Reconciling items
Business consolidation and other activities		(438)	5	(439)
Operating segments | Beverage packaging, South America
Net sales
Net sales	405	534	855	1,028
Comparable operating earnings
Reportable segment comparable operating earnings	30	52	80	130
Reconciling items
Business consolidation and other activities	1	(21)	(1)	(22)
Operating segments | Aerospace
Net sales
Net sales	499	490	1,007	994
Comparable operating earnings
Reportable segment comparable operating earnings	54	36	114	79
Other.
Net sales
Net sales	205	202	398	369
Reconciling items
Business consolidation and other activities		(6)	(1)	276
Rexam
Reconciling items
Amortization of acquired intangibles	$ (34)	$ (32)	$ (68)	$ (69)