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Segment Information (Summary of Sales by Major Product) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenue recognized	$ 2,962	$ 3,167	$ 2,689	$ 2,757	$ 2,791	$ 3,084	$ 3,035	$ 2,755	$ 11,575	$ 11,665	$ 11,151
Metal beverage cans and ends
Segment Reporting Information [Line Items]
Revenue recognized									5,716	5,588	5,551
Metal food cans and ends
Segment Reporting Information [Line Items]
Revenue recognized									2,507	2,435	2,452
Transit Packaging
Segment Reporting Information [Line Items]
Revenue recognized									2,018	2,274	1,800
Other metal packaging
Segment Reporting Information [Line Items]
Revenue recognized									851	887	884
Other products
Segment Reporting Information [Line Items]
Revenue recognized									$ 483	$ 481	$ 464

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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