Segment Information (Summary of Sales by Major Product) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net sales	$ 2,734	$ 3,174	$ 3,046	$ 2,197	$ 2,168	$ 2,468	$ 2,161	$ 1,901	$ 11,151	$ 8,698	$ 8,284
Metal beverage cans and ends
Segment Reporting Information [Line Items]
Net sales									5,551	5,085	4,834
Metal food cans and ends
Segment Reporting Information [Line Items]
Net sales									2,452	2,331	2,213
Transit Packaging
Segment Reporting Information [Line Items]
Net sales									1,800	0	0
Other metal packaging
Segment Reporting Information [Line Items]
Net sales									884	887	877
Other products
Segment Reporting Information [Line Items]
Net sales									$ 464	$ 395	$ 360