Employee Benefit Obligations - Components of net periodic benefit cost (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Apr. 30, 2020	Mar. 31, 2020	Mar. 31, 2019
Selling, general and administrative
Ball-sponsored plans:
Non-service pension income		$ 6	$ 6
Forecast
Ball-sponsored plans:
Noncash charge for settlement	$ 100
Defined Benefit Pension Plans
Ball-sponsored plans:
Total net periodic benefit cost		14	10
Contributions to pension plans		11	6
Expected contributions to pension plans for the full year		90
Defined Benefit Pension Plans | Ball Sponsored Plans
Ball-sponsored plans:
Service cost		20	15
Interest cost		34	43
Expected return on plan assets		(52)	(56)
Amortization of prior service cost		1	1
Recognized net actuarial loss		11	7
U.S. | Defined Benefit Pension Plans
Ball-sponsored plans:
Total net periodic benefit cost		15	15
U.S. | Defined Benefit Pension Plans | Ball Sponsored Plans
Ball-sponsored plans:
Service cost		16	12
Interest cost		20	25
Expected return on plan assets		(31)	(28)
Recognized net actuarial loss		10	6
Foreign | Defined Benefit Pension Plans
Ball-sponsored plans:
Total net periodic benefit cost		(1)	(5)
Foreign | Defined Benefit Pension Plans | Ball Sponsored Plans
Ball-sponsored plans:
Service cost		4	3
Interest cost		14	18
Expected return on plan assets		(21)	(28)
Amortization of prior service cost		1	1
Recognized net actuarial loss		$ 1	$ 1