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Segment Information (Tables) | 6 Months Ended
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Jun. 30, 2016
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 |
Second quarter ended June 30, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third-party sales |  | $ | 694 |  |  | $ | 1,119 |  |  | $ | 1,550 |  |  | $ | 1,465 |  |  | $ | 467 |  |  | $ | 5,295 |
Intersegment sales |  |  | 300 |  |  |  | 473 |  |  |  | 29 |  |  |  | — |  |  |  | — |  |  |  | 802 |
Total sales |  | $ | 994 |  |  | $ | 1,592 |  |  | $ | 1,579 |  |  | $ | 1,465 |  |  | $ | 467 |  |  | $ | 6,097 |
Profit and loss: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity loss |  | $ | (7 | ) |  | $ | — |  |  | $ | (10 | ) |  | $ | — |  |  | $ | — |  |  | $ | (17 | )
Depreciation, depletion, and amortization |  |  | 66 |  |  |  | 101 |  |  |  | 55 |  |  |  | 62 |  |  |  | 12 |  |  |  | 296 |
Income taxes |  |  | 40 |  |  |  | — |  |  |  | 28 |  |  |  | 87 |  |  |  | 18 |  |  |  | 173 |
After-tax operating income (ATOI) |  |  | 109 |  |  |  | 41 |  |  |  | 68 |  |  |  | 180 |  |  |  | 46 |  |  |  | 444 |
Second quarter ended June 30, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third-party sales |  | $ | 924 |  |  | $ | 1,534 |  |  | $ | 1,668 |  |  | $ | 1,279 |  |  | $ | 492 |  |  | $ | 5,897 |
Intersegment sales |  |  | 431 |  |  |  | 562 |  |  |  | 34 |  |  |  | — |  |  |  | — |  |  |  | 1,027 |
Total sales |  | $ | 1,355 |  |  | $ | 2,096 |  |  | $ | 1,702 |  |  | $ | 1,279 |  |  | $ | 492 |  |  | $ | 6,924 |
Profit and loss: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity loss |  | $ | (11 | ) |  | $ | (5 | ) |  | $ | (7 | ) |  | $ | — |  |  | $ | — |  |  | $ | (23 | )
Depreciation, depletion, and amortization |  |  | 77 |  |  |  | 109 |  |  |  | 56 |  |  |  | 54 |  |  |  | 11 |  |  |  | 307 |
Income taxes |  |  | 87 |  |  |  | 6 |  |  |  | 25 |  |  |  | 81 |  |  |  | 17 |  |  |  | 216 |
ATOI |  |  | 215 |  |  |  | 67 |  |  |  | 76 |  |  |  | 165 |  |  |  | 44 |  |  |  | 567 |
|  | Alumina |  |  | Primary Metals |  |  | Global Rolled Products |  |  | Engineered Products and Solutions |  |  | Transportation and Construction Solutions |  |  | Total |
Six months ended June 30, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third-party sales |  | $ | 1,239 |  |  | $ | 2,242 |  |  | $ | 2,947 |  |  | $ | 2,914 |  |  | $ | 896 |  |  | $ | 10,238 |
Intersegment sales |  |  | 592 |  |  |  | 948 |  |  |  | 58 |  |  |  | — |  |  |  | — |  |  |  | 1,598 |
Total sales |  | $ | 1,831 |  |  | $ | 3,190 |  |  | $ | 3,005 |  |  | $ | 2,914 |  |  | $ | 896 |  |  | $ | 11,836 |
Profit and loss: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity (loss) income |  | $ | (21 | ) |  | $ | 4 |  |  | $ | (21 | ) |  | $ | — |  |  | $ | — |  |  | $ | (38 | )
Depreciation, depletion, and amortization |  |  | 129 |  |  |  | 203 |  |  |  | 111 |  |  |  | 127 |  |  |  | 23 |  |  |  | 593 |
Income taxes |  |  | 45 |  |  |  | (16 | ) |  |  | 62 |  |  |  | 165 |  |  |  | 32 |  |  |  | 288 |
ATOI |  |  | 117 |  |  |  | 55 |  |  |  | 136 |  |  |  | 342 |  |  |  | 85 |  |  |  | 735 |
Six months ended June 30, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third-party sales |  | $ | 1,811 |  |  | $ | 3,106 |  |  | $ | 3,289 |  |  | $ | 2,536 |  |  | $ | 963 |  |  | $ | 11,705 |
Intersegment sales |  |  | 932 |  |  |  | 1,254 |  |  |  | 70 |  |  |  | — |  |  |  | — |  |  |  | 2,256 |
Total sales |  | $ | 2,743 |  |  | $ | 4,360 |  |  | $ | 3,359 |  |  | $ | 2,536 |  |  | $ | 963 |  |  | $ | 13,961 |
Profit and loss: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity loss |  | $ | (18 | ) |  | $ | (8 | ) |  | $ | (16 | ) |  | $ | — |  |  | $ | — |  |  | $ | (42 | )
Depreciation, depletion, and amortization |  |  | 157 |  |  |  | 218 |  |  |  | 112 |  |  |  | 105 |  |  |  | 21 |  |  |  | 613 |
Income taxes |  |  | 179 |  |  |  | 63 |  |  |  | 61 |  |  |  | 157 |  |  |  | 31 |  |  |  | 491 |
ATOI |  |  | 436 |  |  |  | 254 |  |  |  | 130 |  |  |  | 321 |  |  |  | 82 |  |  |  | 1,223 |
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:
|  | Second quarter ended June 30, |  |  | Six months ended June 30, |
|  | 2016 |  |  | 2015 |  |  | 2016 |  |  | 2015 |
Total segment ATOI |  | $ | 444 |  |  | $ | 567 |  |  | $ | 735 |  |  | $ | 1,223 |
Unallocated amounts (net of tax): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impact of LIFO |  |  | (10 | ) |  |  | 36 |  |  |  | (6 | ) |  |  | 43 |
Metal price lag |  |  | 7 |  |  |  | (39 | ) |  |  | 8 |  |  |  | (62 | )
Interest expense |  |  | (84 | ) |  |  | (80 | ) |  |  | (167 | ) |  |  | (160 | )
Noncontrolling interests |  |  | (43 | ) |  |  | (67 | ) |  |  | (38 | ) |  |  | (127 | )
Corporate expense |  |  | (77 | ) |  |  | (65 | ) |  |  | (132 | ) |  |  | (127 | )
Restructuring and other charges |  |  | (15 | ) |  |  | (159 | ) |  |  | (76 | ) |  |  | (320 | )
Other |  |  | (87 | ) |  |  | (53 | ) |  |  | (173 | ) |  |  | (135 | )
Consolidated net income attributable to Alcoa |  | $ | 135 |  |  | $ | 140 |  |  | $ | 151 |  |  | $ | 335 |

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8736-108599 + Details
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