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Segment Information - Schedule of Segment Adjusted EBITDA to Consolidated Net Income (Loss) Attributable to Alcoa Corporation (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Segment Reporting Information [Line Items] |  |  |  |
Total Segment Adjusted EBITDA | $ 625 | $ 185 | $ 1,194 | $ 560
Transformation | (13) | (10) | (24) | (26)
Intersegment eliminations | 35 | 30 | 28 | 22
Corporate expenses | (28) | (21) | (54) | (48)
Provision for depreciation, depletion, and amortization | (161) | (152) | (343) | (322)
Restructuring and other charges, net (D) | (33) | (37) | (40) | (39)
Interest expense | (67) | (32) | (109) | (62)
Other income (expenses), net (Q) | 105 | (51) | 129 | 81
Income (loss) before income taxes | 461 | (105) | 773 | 114
Provision for income taxes | (111) | (45) | (204) | (125)
Net income attributable to noncontrolling interest | (41) | (47) | (85) | (106)
NET INCOME (LOSS) ATTRIBUTABLE TO ALCOA CORPORATION | 309 | (197) | 484 | (117)
Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Restructuring and other charges, net (D) | (33) | (37) | (40) | (39)
Other | $ (2) | $ (17) | $ (8) | $ (52)

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