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Statement of Changes in Consolidated Equity - USD ($) $ in Millions | Total | Preferred Class A | Preferred Class B | Preferred stock | Mandatory convertible preferred stock | Common stock | Additional capital | Retained earnings (deficit) | Retained earnings (deficit) Preferred Class A | Retained earnings (deficit) Preferred Class B | Treasury stock | Accumulated Other Comprehensive Loss | Noncontrolling Interests
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at beginning of period at Dec. 31, 2014 | $ 14,794 |  |  | $ 55 | $ 3 | $ 1,304 | $ 9,284 | $ 9,379 |  |  | $ (3,042) | $ (4,677) | $ 2,488
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income | (197) |  |  |  |  |  |  | (322) |  |  |  |  | 125
Other comprehensive loss (B) | (1,176) |  |  |  |  |  |  |  |  |  |  | (754) | (422)
Cash dividends declared: |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared, preferred |  | $ (2) | $ (67) |  |  |  |  |  | $ (2) | $ (67) |  |  |
Cash dividends declared, common | (154) |  |  |  |  |  |  | (154) |  |  |  |  |
Equity option on convertible notes (F) | 55 |  |  |  |  |  | 55 |  |  |  |  |  |
Stock-based compensation (O) | 92 |  |  |  |  |  | 92 |  |  |  |  |  |
Common stock issued: compensation plans (O) | 22 |  |  |  |  |  | (195) |  |  |  | 217 |  |
Issuance of common stock (F and O) | 870 |  |  |  |  | 87 | 783 |  |  |  |  |  |
Distributions | (106) |  |  |  |  |  |  |  |  |  |  |  | (106)
Contributions | 2 |  |  |  |  |  |  |  |  |  |  |  | 2
Other | (2) |  |  |  |  |  |  |  |  |  |  |  |
Balance at end of period at Dec. 31, 2015 | 14,131 |  |  | 55 | 3 | 1,391 | 10,019 | 8,834 |  |  | (2,825) | (5,431) | 2,085
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income | (878) |  |  |  |  |  |  | (941) |  |  |  |  | 63
Other comprehensive loss (B) | (507) |  |  |  |  |  |  |  |  |  |  | (691) | 184
Cash dividends declared: |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared, preferred |  | (2) | (67) |  |  |  |  |  | (2) | (67) |  |  |
Cash dividends declared, common | (159) |  |  |  |  |  |  | (159) |  |  |  |  |
Stock-based compensation (O) | 86 |  |  |  |  |  | 86 |  |  |  |  |  |
Common stock issued: compensation plans (O) | (19) |  |  |  |  |  | (205) |  |  |  | 186 |  |
Distributions | (226) |  |  |  |  |  |  |  |  |  |  |  | (226)
Contributions | 51 |  |  |  |  |  |  |  |  |  |  |  | 51
Retirement of Treasury stock (O) | 0 |  |  |  |  | (76) | (2,563) |  |  |  | 2,639 |  |
Reverse stock split (O) | 0 |  |  |  |  | (877) | 877 |  |  |  |  |  |
Distribution of Alcoa Corporation | (7,271) |  |  |  |  |  |  | (8,692) |  |  |  | 3,554 | (2,133)
Other | 2 |  |  |  |  |  |  |  |  |  |  |  | 2
Balance at end of period at Dec. 31, 2016 | 5,141 |  |  | 55 | 3 | 438 | 8,214 | (1,027) |  |  | 0 | (2,568) | 26
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income | (74) |  |  |  |  |  |  | (74) |  |  |  |  | 0
Other comprehensive loss (B) | (74) |  |  |  |  |  |  |  |  |  |  | (76) | 2
Cash dividends declared: |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared, preferred |  | $ (2) | $ (51) |  |  |  |  |  | $ (2) | $ (51) |  |  |
Cash dividends declared, common | (109) |  |  |  |  |  |  | (109) |  |  |  |  |
Stock-based compensation (O) | 67 |  |  |  |  |  | 67 |  |  |  |  |  |
Common stock issued: compensation plans (O) | 21 |  |  |  |  |  | 21 |  |  |  |  |  |
Issuance of common stock (F and O) | 4 |  |  |  |  | 4 |  |  |  |  |  |  |
Distributions | (14) |  |  |  |  |  |  |  |  |  |  |  | (14)
Conversion of mandatory convertible preferred stock (O) | 0 |  |  |  | (3) | 39 | (36) |  |  |  |  |  |
Other | 15 |  |  |  |  |  |  | 15 |  |  |  |  | 0
Balance at end of period at Dec. 31, 2017 | $ 4,924 |  |  | $ 55 | $ 0 | $ 481 | $ 8,266 | $ (1,248) |  |  | $ 0 | $ (2,644) | $ 14

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