Employee Benefit Obligations - Components of net periodic benefit cost (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Apr. 30, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Ball-sponsored plans:
Noncash charge for settlement	$ (97)
Settlement loss		$ 97		$ 97
Selling, general and administrative
Ball-sponsored plans:
Non-service pension income		6	$ 6	12	$ 11
Defined Benefit Pension Plans
Ball-sponsored plans:
Contributions to pension plans				11	73
Expected contributions to pension plans for the full year		90		90
Defined Benefit Pension Plans | Ball Sponsored Plans
Ball-sponsored plans:
Service cost		20	15	40	30
Interest cost		33	43	67	86
Expected return on plan assets		(52)	(56)	(104)	(112)
Amortization of prior service cost		1	1	2	2
Recognized net actuarial loss		12	6	23	13
Settlement losses		97		97
Net periodic benefit cost for Ball sponsored plans		111	9
Total net periodic benefit cost				125	19
U.S.
Ball-sponsored plans:
Payments to participants	$ 245
U.S. | Defined Benefit Pension Plans | Ball Sponsored Plans
Ball-sponsored plans:
Service cost		16	12	32	24
Interest cost		18	25	38	50
Expected return on plan assets		(31)	(29)	(62)	(57)
Amortization of prior service cost		1		1
Recognized net actuarial loss		10	5	20	11
Settlement losses		97		97
Net periodic benefit cost for Ball sponsored plans		111	13
Total net periodic benefit cost				126	28
Foreign | Defined Benefit Pension Plans | Ball Sponsored Plans
Ball-sponsored plans:
Service cost		4	3	8	6
Interest cost		15	18	29	36
Expected return on plan assets		(21)	(27)	(42)	(55)
Amortization of prior service cost			1	1	2
Recognized net actuarial loss		$ 2	1	3	2
Net periodic benefit cost for Ball sponsored plans			$ (4)
Total net periodic benefit cost				$ (1)	$ (9)