Employee Benefit Obligations - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Ball-sponsored plans:
Curtailment and settlement losses including special termination benefits		$ 8
Total net periodic benefit cost		47
Business consolidation and other activities
Ball-sponsored plans:
Settlement loss		8	$ 36	$ 44
Selling, general and administrative
Ball-sponsored plans:
Non-service pension income		22	5	(21)
Forecast
Ball-sponsored plans:
Total net periodic benefit cost	$ 49
US Plan
Ball-sponsored plans:
Pension benefit obligation to be transferred		32	176	224
Defined Benefit Pension Plans
Ball-sponsored plans:
Service cost		61	65	66
Interest cost		173	171	216
Expected return on plan assets		(225)	(216)	(236)
Amortization of prior service cost		4	2	2
Recognized net actuarial loss		26	38	39
Curtailment and settlement losses including special termination benefits		8	36	46
Net periodic benefit cost for Ball sponsored plans		47	96	133
Net periodic benefit cost for multiemployer plans		1	2	2
Total net periodic benefit cost		48	98	135
Non-service pension income		1	2
Estimated actuarial net gain (loss) that will be amortized from accumulated other comprehensive loss into net periodic benefit cost during next fiscal year		(41)
Estimated prior service cost (benefit) that will be amortized from accumulated other comprehensive earnings (loss) into net periodic benefit cost during next fiscal year		1
Defined Benefit Pension Plans | US Plan
Ball-sponsored plans:
Service cost		50	51	49
Interest cost		101	99	124
Expected return on plan assets		(116)	(108)	(126)
Amortization of prior service cost		1	2	2
Recognized net actuarial loss		22	33	34
Curtailment and settlement losses including special termination benefits			36	47
Net periodic benefit cost for Ball sponsored plans		58	113	130
Net periodic benefit cost for multiemployer plans		1	2	2
Total net periodic benefit cost		59	115	132
Expected benefit payments
2020		393
2021		361
2022		366
2023		370
2024		373
Years 2025 through 2029		1,900
Defined Benefit Pension Plans | Foreign
Ball-sponsored plans:
Service cost		11	14	17
Interest cost		72	72	92
Expected return on plan assets		(109)	(108)	(110)
Amortization of prior service cost		3
Recognized net actuarial loss		4	5	5
Curtailment and settlement losses including special termination benefits		8		(1)
Net periodic benefit cost for Ball sponsored plans		(11)	(17)	3
Total net periodic benefit cost		(11)	(17)	$ 3
Non-service pension income		$ 1	$ 2
Excluding German Swedish And Certain U S Plans | Defined Benefit Pension Plans | US Plan | Forecast
Ball-sponsored plans:
Contributions to pension plans	$ 90