Employee Benefit Obligations - Components of net periodic benefit cost (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Ball-sponsored plans:
Pension benefit obligation transferred	$ 325
Settlement loss	130
Location of settlement loss			Business consolidation and other activities	Business consolidation and other activities
Selling, general and administrative
Ball-sponsored plans:
Non-service pension income	11	$ 7	$ 32	$ 19
Defined Benefit Pension Plans
Ball-sponsored plans:
Contributions to pension plans			203	92
Expected contributions to pension plans for the full year	215		215
Defined Benefit Pension Plans | Ball Sponsored Plans
Ball-sponsored plans:
Service cost	24	20	72	60
Interest cost	21	32	65	99
Expected return on plan assets	(46)	(51)	(140)	(155)
Amortization of prior service cost	1	1	3	3
Recognized net actuarial loss	13	11	40	34
Settlement losses	130	5	130	102
Total net periodic benefit cost	143	18	170	143
United States | Defined Benefit Pension Plans | Ball Sponsored Plans
Ball-sponsored plans:
Service cost	20	16	62	48
Interest cost	12	18	38	56
Expected return on plan assets	(29)	(29)	(91)	(91)
Amortization of prior service cost			1	1
Recognized net actuarial loss	12	10	36	30
Settlement losses	130	5	130	102
Total net periodic benefit cost	145	20	176	146
Foreign | Defined Benefit Pension Plans | Ball Sponsored Plans
Ball-sponsored plans:
Service cost	4	4	10	12
Interest cost	9	14	27	43
Expected return on plan assets	(17)	(22)	(49)	(64)
Amortization of prior service cost	1	1	2	2
Recognized net actuarial loss	1	1	4	4
Total net periodic benefit cost	$ (2)	$ (2)	$ (6)	$ (3)