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Segment Information - Schedule of Segment ATOI to Consolidated Net Income Attributable to Arconic (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |
Total segment ATOI | $ 395 | $ 410 | $ 1,130 | $ 1,633
Metal price lag | 4 | (48) | 12 | (110)
Interest expense | (133) | (123) | (389) | (369)
Noncontrolling interests | (20) | (62) | (58) | (189)
Consolidated net income attributable to Arconic | 166 | 44 | 317 | 379
Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Impact of LIFO | 1 | 50 | (5) | 93
Interest expense | (86) | (80) | (253) | (240)
Noncontrolling interests | (20) | (62) | (58) | (189)
Corporate expense | (77) | (72) | (209) | (199)
Restructuring and other charges | (13) | (48) | (89) | (368)
Other | $ (38) | $ (106) | $ (211) | $ (241)

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