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CONSOLIDATED CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Millions | Total | Common Stock | Treasury Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive loss
--- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2017 | $ 20,572 | $ 179 | $ (9,168) | $ 7,884 | $ 21,935 | $ (258)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 708 |  |  |  | 708 |
Other comprehensive income, net of tax | 4 |  |  |  |  | 4
Dividends on common stock | (594) |  |  |  | (594) |
Issuance of common stock, net | 32 |  |  | 32 |  |
Reclassification of stranded tax effects |  |  |  |  | 58 | (58)
Ending balance at Mar. 31, 2018 | 20,722 | 179 | (9,168) | 7,916 | 22,107 | (312)
Beginning balance at Dec. 31, 2018 | 21,330 | 179 | (10,473) | 8,046 | 23,750 | (172)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 631 |  |  |  | 631 |
Other comprehensive income, net of tax | 4 |  |  |  |  | 4
Dividends on common stock | (586) |  |  |  | (586) |
Issuance of common stock, net | 37 |  |  | 37 |  |
Purchases of treasury stock | (180) |  | (180) |  |  |
Ending balance at Mar. 31, 2019 | $ 21,236 | $ 179 | $ (10,653) | $ 8,083 | $ 23,795 | $ (168)

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