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Quarterly Data | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Data | Supplemental Financial Information (unaudited) Quarterly Data (in millions, except per-share amounts)
| First | Second | Third | Fourth(2) | Year
2017 |  |  |  |  |
Sales | $ | 3,192 |  | $ | 3,261 |  | $ | 3,236 |  | $ | 3,271 |  | $ | 12,960 |
Net income (loss) attributable to Arconic | $ | 322 |  | $ | 212 |  | $ | 119 |  | $ | (727 | ) | $ | (74 | )
Earnings (loss) per share attributable to Arconic common shareholders(1): |  |  |  |  |
Basic |  |  |  |  |
Net income (loss) per share—basic | $ | 0.69 |  | $ | 0.44 |  | $ | 0.23 |  | $ | (1.51 | ) | $ | (0.28 | )
Diluted |  |  |  |  |
Net income (loss) per share—diluted | $ | 0.65 |  | $ | 0.43 |  | $ | 0.22 |  | $ | (1.51 | ) | $ | (0.28 | )
2016 |  |  |  |  |
Sales | $ | 3,055 |  | $ | 3,234 |  | $ | 3,138 |  | $ | 2,967 |  | $ | 12,394 |
Net income (loss) attributable to Arconic | $ | 16 |  | $ | 135 |  | $ | 166 |  | $ | (1,258 | ) | $ | (941 | )
Earnings (loss) per share attributable to Arconic common shareholders(1): |  |  |  |  |
Basic |  |  |  |  |
Continuing operations | $ | 0.21 |  | $ | 0.08 |  | $ | 0.11 |  | $ | (2.98 | ) | $ | (2.58 | )
Discontinued operations | (0.21 | ) | 0.19 |  | 0.23 |  | 0.07 |  | 0.27 |
Net income (loss) per share—basic | $ | 0.00 |  | $ | 0.27 |  | $ | 0.34 |  | $ | (2.91 | ) | $ | (2.31 | )
Diluted |  |  |  |  |
Continuing operations | $ | 0.21 |  | $ | 0.08 |  | $ | 0.11 |  | $ | (2.98 | ) | $ | (2.58 | )
Discontinued operations | (0.21 | ) | 0.19 |  | 0.22 |  | 0.07 |  | 0.27 |
Net income (loss) per share—basic | $ | 0.00 |  | $ | 0.27 |  | $ | 0.33 |  | $ | (2.91 | ) | $ | (2.31 | )
(1) | Per share amounts are calculated independently for each period presented; therefore, the sum of the quarterly per share amounts may not equal the per share amounts for the year.
(2) | In the fourth quarter of 2017, Arconic recorded an impairment of goodwill related to the forgings and extrusions business of $719 ($719 pre-tax); a provisional charge of $272 associated with the revaluation of U.S. net deferred tax assets due to a decrease in the U.S. corporate tax rate from 35% to 21%, as well as a one-time transition tax on the non-previously taxed earnings and profits of certain U.S.-owned foreign corporations as of December 31, 2017; a favorable adjustment to the Firth Rixson earn-out liability of $81 ($81 pre-tax); and a favorable adjustment to a separation-related guarantee liability of $18 ($25 pre-tax). In the fourth quarter of 2016, as a result of the Separation Transaction, Arconic recorded a charge of $1,267 for valuation allowances on certain deferred tax assets.

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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