Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount of transfers into (out of) an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Percentage of fair value of reporting unit in excess of carrying amount.

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Goodwill (Details) - USD ($) $ in Millions	3 Months Ended
Goodwill (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Goodwill
Opening balance sheet adjustments	$ (356)
Business disposition	(9)
Effects of currency exchange rates	128
Balance at the end of the period	4,858
Goodwill	4,858	$ 5,095
Rexam
Goodwill
Goodwill			$ 3,415
Beverage packaging, North And Central America
Goodwill
Opening balance sheet adjustments	(340)
Balance at the end of the period	1,274
Goodwill	1,274	1,614
Beverage packaging, South America
Goodwill
Opening balance sheet adjustments	328
Balance at the end of the period	1,298
Goodwill	1,298	970
Beverage packaging, Europe
Goodwill
Opening balance sheet adjustments	(276)
Effects of currency exchange rates	106
Balance at the end of the period	1,462
Goodwill	1,462	1,632
Food and aerosol packaging
Goodwill
Business disposition	(9)
Effects of currency exchange rates	12
Balance at the end of the period	602
Goodwill	602	599
Aerospace
Goodwill
Balance at the end of the period	40
Goodwill	40	40
Other
Goodwill
Opening balance sheet adjustments	(68)
Effects of currency exchange rates	10
Balance at the end of the period	182
Goodwill	182	$ 240
Beverage packaging, Asia
Goodwill
Balance at the end of the period	78
Percentage of fair value exceeding carrying value		23.00%
Goodwill	$ 78