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
-Subparagraph (a)
-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=77989000&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.

+ References

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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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- Definition

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

+ References

No definition available.

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Goodwill (Details) - USD ($) $ in Millions	9 Months Ended
Goodwill (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Goodwill
Balance at the beginning of the period	$ 5,095
Opening balance sheet adjustments	(352)
Business disposition	(9)
Effects of currency exchange rates	174
Balance at the end of the period	4,908
Goodwill	5,095	$ 5,095
Rexam
Goodwill
Goodwill			$ 3,415
Beverage packaging, North And Central America
Goodwill
Balance at the beginning of the period	1,614
Opening balance sheet adjustments	(337)
Balance at the end of the period	1,277
Goodwill	1,614	1,614
Beverage packaging, South America
Goodwill
Balance at the beginning of the period	970
Opening balance sheet adjustments	329
Balance at the end of the period	1,299
Goodwill	970	970
Beverage packaging, Europe
Goodwill
Balance at the beginning of the period	1,632
Opening balance sheet adjustments	(276)
Effects of currency exchange rates	150
Balance at the end of the period	1,506
Goodwill	1,632	1,632
Food and aerosol packaging
Goodwill
Balance at the beginning of the period	599
Business disposition	(9)
Effects of currency exchange rates	17
Balance at the end of the period	607
Goodwill	599	599
Aerospace
Goodwill
Balance at the beginning of the period	40
Balance at the end of the period	40
Goodwill	40	40
Other
Goodwill
Balance at the beginning of the period	240
Opening balance sheet adjustments	(68)
Effects of currency exchange rates	7
Balance at the end of the period	179
Goodwill	240	$ 240
Beverage packaging, Asia
Goodwill
Balance at the end of the period	78
Percentage of fair value exceeding carrying value		23.00%
Goodwill	$ 78