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Earnings Per Share - Reconciliation of Information Used to Compute Basic and Diluted EPS (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Earnings Per Share [Abstract] |  |
Net income | $ 187 | $ 143
Less: preferred stock dividends declared | (1) | (1)
Net income available to Arconic common shareholders - basic | 186 | 142
Add: Interest expense related to convertible notes | 4 | 3
Net income available to Arconic common shareholders - diluted | $ 190 | $ 145
Average shares outstanding - basic (in shares) | 471 | 482
Effect of dilutive securities: |  |
Stock options (in shares) | 0 | 5
Stock and performance awards (in shares) | 4 | 2
Convertible notes (in shares) | 14 | 14
Weighted average shares outstanding - diluted (in shares) | 489 | 503
Common stock outstanding | 453 | 483
Incremental common shares attributable to dilutive effect of accelerated share repurchase agreements | 32 |

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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of accelerated share repurchase agreements. An accelerated share repurchase program is a combination of transactions that permits an entity to purchase a targeted number of shares immediately with the final purchase price of those shares determined by an average market price over a fixed period of time. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e1707-109256 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
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