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Segment Information - Schedule of Operating Results of Arconic's Reportable Segments (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Total sales	$ 3,192	$ 3,055
Depreciation and amortization	126	126
Adjusted EBITDA	549	524
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total sales	3,217	3,091
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Intersegment sales	34	29
Third-Party Sales [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Third-party sales	3,183	3,062
Engineered Products and Solutions [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	64	65
Adjusted EBITDA	306	305
Engineered Products and Solutions [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total sales	1,485	1,449
Engineered Products and Solutions [Member] | Third-Party Sales [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Third-party sales	1,485	1,449
Global Rolled Products [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	50	50
Adjusted EBITDA	171	155
Global Rolled Products [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total sales	1,283	1,213
Global Rolled Products [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Intersegment sales	34	29
Global Rolled Products [Member] | Third-Party Sales [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Third-party sales	1,249	1,184
Transportation and Construction Solutions [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	12	11
Adjusted EBITDA	72	64
Transportation and Construction Solutions [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total sales	449	429
Transportation and Construction Solutions [Member] | Third-Party Sales [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Third-party sales	$ 449	$ 429

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(a))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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