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Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions | Common Stock | Treasury Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Total
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2014 | $ 178 | $ (8,528) | $ 7,599 | $ 36,067 | $ (357) | $ 34,959
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income (loss) |  |  |  | (7,829) |  | (7,829)
Other comprehensive income (loss), net of tax |  |  |  |  | 50 | 50
Dividends on common stock |  |  |  | (2,278) |  | (2,278)
Issuance of common stock and other, net |  |  | 41 |  |  | 41
Purchases of treasury stock |  | (593) |  |  |  | (593)
Balance at Dec. 31, 2015 | 178 | (9,121) | 7,640 | 25,960 | (307) | 24,350
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income (loss) |  |  |  | (574) |  | (574)
Other comprehensive income (loss), net of tax |  |  |  |  | 41 | 41
Dividends on common stock |  |  |  | (2,405) |  | (2,405)
Issuance of common stock and other, net |  |  | 107 |  |  | 107
Purchases of treasury stock |  | (22) |  |  |  | (22)
Balance at Dec. 31, 2016 | 178 | (9,143) | 7,747 | 22,981 | (266) | 21,497
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income (loss) |  |  |  | 1,311 |  | 1,311
Other comprehensive income (loss), net of tax |  |  |  |  | 8 | 8
Dividends on common stock |  |  |  | (2,357) |  | (2,357)
Issuance of common stock and other, net | 1 |  | 137 |  |  | 138
Purchases of treasury stock |  | (25) |  |  |  | (25)
Balance at Dec. 31, 2017 | $ 179 | $ (9,168) | $ 7,884 | $ 21,935 | $ (258) | $ 20,572

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