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Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions | Total | Common Stock | Treasury Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2015 | $ 24,350 | $ 178 | $ (9,121) | $ 7,640 | $ 25,960 | $ (307)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income (loss) | (574) |  |  |  | (574) |
Other comprehensive income, 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 | 21,497 | 178 | (9,143) | 7,747 | 22,981 | (266)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income (loss) | 1,311 |  |  |  | 1,311 |
Other comprehensive income, net of tax | 8 |  |  |  |  | 8
Dividends on common stock | (2,357) |  |  |  | (2,357) |
Issuance of common stock and other, net | 138 | 1 |  | 137 |  |
Purchases of treasury stock | (25) |  | (25) |  |  |
Balance at Dec. 31, 2017 | 20,572 | 179 | (9,168) | 7,884 | 21,935 | (258)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income (loss) | 4,131 |  |  |  | 4,131 |
Other comprehensive income, net of tax | 144 |  |  |  |  | 144
Dividends on common stock | (2,374) |  |  |  | (2,374) |
Issuance of common stock and other, net | 162 |  |  | 162 |  |
Purchases of treasury stock | (1,305) |  | (1,305) |  |  |
Reclassification of stranded tax effects |  |  |  |  | 58 | (58)
Balance at Dec. 31, 2018 | $ 21,330 | $ 179 | $ (10,473) | $ 8,046 | $ 23,750 | $ (172)

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