Employee Benefit Obligations - Components of net periodic benefit cost (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Selling, general and administrative
Ball-sponsored plans:
Non-service pension income	$ 10	$ 6
Defined Benefit Pension Plans
Ball-sponsored plans:
Contributions to pension plans	162	11
Expected contributions to pension plans for the full year	185
Defined Benefit Pension Plans | Ball Sponsored Plans
Ball-sponsored plans:
Service cost	24	20
Interest cost	22	34
Expected return on plan assets	(47)	(52)
Amortization of prior service cost	1	1
Recognized net actuarial loss	14	11
Total net periodic benefit cost	14	14
U.S. | Defined Benefit Pension Plans | Ball Sponsored Plans
Ball-sponsored plans:
Service cost	21	16
Interest cost	13	20
Expected return on plan assets	(31)	(31)
Recognized net actuarial loss	13	10
Total net periodic benefit cost	16	15
Foreign | Defined Benefit Pension Plans | Ball Sponsored Plans
Ball-sponsored plans:
Service cost	3	4
Interest cost	9	14
Expected return on plan assets	(16)	(21)
Amortization of prior service cost	1	1
Recognized net actuarial loss	1	1
Total net periodic benefit cost	$ (2)	$ (1)