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Subsequent Events | 9 Months Ended
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Sep. 30, 2017
Subsequent Events [Abstract] |
Subsequent Events | O. Subsequent Events On October 2, 2017, all outstanding 24,975,978 depositary shares (each depositary share representing a 1/10th interest in a share of the mandatory convertible preferred stock) were converted at a rate of 1.56996 into 39,211,286 common shares; 24,022 depositary shares were previously tendered for early conversion into 31,428 shares of Arconic common stock. No gain or loss was recognized associated with this equity transaction. On October 13, 2017, Alcoa Corporation announced that it had terminated an electricity contract with Luminant Generation Company LLC, effective as of October 1, 2017, that was tied to its Rockdale Operations in Texas. Pursuant to the Separation and Distribution Agreement between Arconic and Alcoa Corporation, Arconic was required to provide a guarantee up to an estimated present value amount of approximately $485 related to this electricity contract for Alcoa Corporation’s facility in the event of an Alcoa Corporation payment default. As a result of the termination of the electricity contract by Alcoa Corporation, Arconic expects to record noncash non-operating income in the fourth quarter of 2017 of approximately $25 ($16 after-tax) associated with the reversal of the fair value of the guarantee which was included in Other noncurrent liabilities and deferred credits on the accompanying Consolidated Balance Sheet.

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- Definition The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 855 -URI http://asc.fasb.org/topic&trid=2122774 + Details
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