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Segment Information (Tables) | 9 Months Ended
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Sep. 30, 2015
Segment Reporting [Abstract] |
Schedule of Operating Results of Alcoa's Reportable Segments | The operating results of Alcoa’s reportable segments were as follows (differences between segment totals and consolidated totals are in Corporate):
|  | Alumina |  |  | Primary Metals |  |  | Global Rolled Products |  |  | Engineered Products and Solutions |  |  | Transportation and Construction Solutions |  |  | Total |
Third quarter ended September 30, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third-party sales |  | $ | 912 |  |  | $ | 1,249 |  |  | $ | 1,527 |  |  | $ | 1,397 |  |  | $ | 475 |  |  | $ | 5,560 |
Intersegment sales |  |  | 391 |  |  |  | 479 |  |  |  | 29 |  |  |  | — |  |  |  | — |  |  |  | 899 |
Total sales |  | $ | 1,303 |  |  | $ | 1,728 |  |  | $ | 1,556 |  |  | $ | 1,397 |  |  | $ | 475 |  |  | $ | 6,459 |
Profit and loss: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity loss |  | $ | (9 | ) |  | $ | (7 | ) |  | $ | (8 | ) |  | $ | — |  |  | $ | — |  |  | $ | (24 | )
Depreciation, depletion, and amortization |  |  | 71 |  |  |  | 106 |  |  |  | 56 |  |  |  | 61 |  |  |  | 11 |  |  |  | 305 |
Income taxes |  |  | 85 |  |  |  | (49 | ) |  |  | 28 |  |  |  | 71 |  |  |  | 18 |  |  |  | 153 |
After-tax operating income (ATOI) |  |  | 212 |  |  |  | (59 | ) |  |  | 62 |  |  |  | 151 |  |  |  | 44 |  |  |  | 410 |
Third quarter ended September 30, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third-party sales |  | $ | 886 |  |  | $ | 1,865 |  |  | $ | 1,926 |  |  | $ | 1,034 |  |  | $ | 523 |  |  | $ | 6,234 |
Intersegment sales |  |  | 482 |  |  |  | 730 |  |  |  | 52 |  |  |  | — |  |  |  | — |  |  |  | 1,264 |
Total sales |  | $ | 1,368 |  |  | $ | 2,595 |  |  | $ | 1,978 |  |  | $ | 1,034 |  |  | $ | 523 |  |  | $ | 7,498 |
Profit and loss: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity loss |  | $ | (7 | ) |  | $ | — |  |  | $ | (8 | ) |  | $ | — |  |  | $ | — |  |  | $ | (15 | )
Depreciation, depletion, and amortization |  |  | 100 |  |  |  | 124 |  |  |  | 62 |  |  |  | 32 |  |  |  | 10 |  |  |  | 328 |
Income taxes |  |  | 26 |  |  |  | 95 |  |  |  | 26 |  |  |  | 78 |  |  |  | 20 |  |  |  | 245 |
ATOI |  |  | 62 |  |  |  | 245 |  |  |  | 69 |  |  |  | 155 |  |  |  | 50 |  |  |  | 581 |
|  | Alumina |  |  | Primary Metals |  |  | Global Rolled Products |  |  | Engineered Products and Solutions |  |  | Transportation and Construction Solutions |  |  | Total |
Nine months ended September 30, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third-party sales |  | $ | 2,723 |  |  | $ | 4,355 |  |  | $ | 4,816 |  |  | $ | 3,933 |  |  | $ | 1,438 |  |  | $ | 17,265 |
Intersegment sales |  |  | 1,323 |  |  |  | 1,733 |  |  |  | 99 |  |  |  | — |  |  |  | — |  |  |  | 3,155 |
Total sales |  | $ | 4,046 |  |  | $ | 6,088 |  |  | $ | 4,915 |  |  | $ | 3,933 |  |  | $ | 1,438 |  |  | $ | 20,420 |
Profit and loss: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity loss |  | $ | (27 | ) |  | $ | (15 | ) |  | $ | (24 | ) |  | $ | — |  |  | $ | — |  |  | $ | (66 | )
Depreciation, depletion, and amortization |  |  | 228 |  |  |  | 324 |  |  |  | 168 |  |  |  | 166 |  |  |  | 32 |  |  |  | 918 |
Income taxes |  |  | 264 |  |  |  | 14 |  |  |  | 89 |  |  |  | 228 |  |  |  | 49 |  |  |  | 644 |
ATOI |  |  | 648 |  |  |  | 195 |  |  |  | 192 |  |  |  | 472 |  |  |  | 126 |  |  |  | 1,633 |
Nine months ended September 30, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third-party sales |  | $ | 2,492 |  |  | $ | 4,948 |  |  | $ | 5,463 |  |  | $ | 3,103 |  |  | $ | 1,521 |  |  | $ | 17,527 |
Intersegment sales |  |  | 1,472 |  |  |  | 2,182 |  |  |  | 139 |  |  |  | — |  |  |  | — |  |  |  | 3,793 |
Total sales |  | $ | 3,964 |  |  | $ | 7,130 |  |  | $ | 5,602 |  |  | $ | 3,103 |  |  | $ | 1,521 |  |  | $ | 21,320 |
Profit and loss: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity loss |  | $ | (19 | ) |  | $ | (45 | ) |  | $ | (19 | ) |  | $ | — |  |  | $ | — |  |  | $ | (83 | )
Depreciation, depletion, and amortization |  |  | 297 |  |  |  | 377 |  |  |  | 178 |  |  |  | 95 |  |  |  | 31 |  |  |  | 978 |
Income taxes |  |  | 78 |  |  |  | 114 |  |  |  | 73 |  |  |  | 234 |  |  |  | 55 |  |  |  | 554 |
ATOI |  |  | 192 |  |  |  | 327 |  |  |  | 193 |  |  |  | 455 |  |  |  | 142 |  |  |  | 1,309 |
Schedule of Segment ATOI to Consolidated Net Income Attributable to Alcoa | The following table reconciles total segment ATOI to consolidated net income attributable to Alcoa:
|  | Third quarter ended September 30, |  |  | Nine months ended September 30, |
|  | 2015 |  |  | 2014 |  |  | 2015 |  |  | 2014 |
Total segment ATOI |  | $ | 410 |  |  | $ | 581 |  |  | $ | 1,633 |  |  | $ | 1,309 |
Unallocated amounts (net of tax): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impact of LIFO |  |  | 50 |  |  |  | (18 | ) |  |  | 93 |  |  |  | (33 | )
Metal price lag |  |  | (48 | ) |  |  | 38 |  |  |  | (110 | ) |  |  | 56 |
Interest expense |  |  | (80 | ) |  |  | (81 | ) |  |  | (240 | ) |  |  | (228 | )
Noncontrolling interests |  |  | (62 | ) |  |  | 18 |  |  |  | (189 | ) |  |  | 46 |
Corporate expense |  |  | (72 | ) |  |  | (72 | ) |  |  | (199 | ) |  |  | (204 | )
Restructuring and other charges |  |  | (48 | ) |  |  | (189 | ) |  |  | (368 | ) |  |  | (587 | )
Other |  |  | (106 | ) |  |  | (128 | ) |  |  | (241 | ) |  |  | (250 | )
Consolidated net income attributable to Alcoa |  | $ | 44 |  |  | $ | 149 |  |  | $ | 379 |  |  | $ | 109 |

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