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Acquisitions and Dispositions - Dispositions (Details) $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($) Plant	Jul. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Assets [Abstract]
Assets held for sale	$ 850		$ 5
Liabilities [Abstract]
Liabilities held for sale	225
Disposal Group, Held-for-sale, Not Discontinued Operations
Assets [Abstract]
Assets held for sale	3
US steel food and steel aerosol packaging \| Disposal Group, Held-for-sale, Not Discontinued Operations
Disposition
After-tax cash expected in exchange for the sale of business		$ 600
Amount of impairment or adjustments required for disposal	$ 0
Number of plants sold \| Plant	9
Assets [Abstract]
Receivables	$ 78
Inventories	231
Property, plant and equipment	192
Goodwill	354
Other assets	33
Allowance for valuation of assets held for sale	(41)
Assets held for sale	847
Liabilities [Abstract]
Accounts payable	198
Other liabilities	27
Liabilities held for sale	$ 225
Ball Metalpack
Disposition
Percentage of ownership in a joint venture		49.00%