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Consolidated Statement of Stockholder's Equity - USD ($) $ in Millions | Total | Common Stock | Capital in excess of par value | Retained earnings | Accumulated other comprehensive income (loss) | Treasury stock
--- | --- | --- | --- | --- | --- | ---
Balance at beginning of period at Dec. 31, 2014 | $ 6,775 | $ 808 | $ 1,315 | $ 7,416 | $ (738) | $ (2,026)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Repurchase of common stock | (1,180) | 0 | 0 | 0 | 0 | (1,180)
Issuance of common and treasury stock pursuant to Employee stock plans | 30 | 0 | 6 | 0 | 0 | 24
Net tax benefit (expense) of options exercised |  | 0 |  | 0 | 0 | 0
Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation | 24 |  | 24 |  |  |
Share-based compensation | 29 | 0 | 29 | 0 | 0 | 0
Cash dividends | (188) | 0 | 0 | (188) | 0 | 0
Comprehensive income | 1,868 | 0 | 0 | 2,181 | (313) | 0
Balance at end of period at Dec. 31, 2015 | 7,358 | 808 | 1,374 | 9,409 | (1,051) | (3,182)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Repurchase of common stock | (1,750) | 0 | 0 | 0 | 0 | (1,750)
Issuance of common and treasury stock pursuant to Employee stock plans | 20 | 0 | 8 | 0 | 0 | 12
Issuance of stock for conversion of debt | 43 | 0 | (5) | 0 | 0 | 48
Share-based compensation | 33 | 0 | 33 | 0 | 0 | 0
Cash dividends | (235) | 0 | 0 | (235) | 0 | 0
Comprehensive income | 2,972 | 0 | 0 | 2,244 | 728 | 0
Balance at end of period at Dec. 31, 2016 | 8,441 | 808 | 1,410 | 11,418 | (323) | (4,872)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Repurchase of common stock | (1,600) | 0 | 0 | 0 | 0 | (1,600)
Issuance of common and treasury stock pursuant to Employee stock plans | 14 | 0 | 4 | 0 | 0 | 10
Share-based compensation | 37 | 0 | 37 | 0 | 0 | 0
Cash dividends | (285) | 0 | 0 | (285) | 0 | 0
Comprehensive income | 3,823 | 0 | 0 | 3,488 | 335 | 0
Balance at end of period at Dec. 31, 2017 | $ 10,430 | $ 808 | $ 1,451 | $ 14,621 | $ 12 | $ (6,462)

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