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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 | 1,556 |  |  |  | 1,556 |
Other comprehensive income (loss), net of tax | 8 |  |  |  |  | 8
Dividends on common stock | (1,188) |  |  |  | (1,188) |
Issuance of common stock, net | 83 |  |  | 83 |  |
Purchases of treasury stock | (100) |  | (100) |  |  |
Reclassification of stranded tax effects |  |  |  |  | 58 | (58)
Ending balance at Jun. 30, 2018 | 20,931 | 179 | (9,268) | 7,967 | 22,361 | (308)
Beginning balance at Mar. 31, 2018 | 20,722 | 179 | (9,168) | 7,916 | 22,107 | (312)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 848 |  |  |  | 848 |
Other comprehensive income (loss), net of tax | 4 |  |  |  |  | 4
Dividends on common stock | (594) |  |  |  | (594) |
Issuance of common stock, net | 51 |  |  | 51 |  |
Purchases of treasury stock | (100) |  | (100) |  |  |
Ending balance at Jun. 30, 2018 | 20,931 | 179 | (9,268) | 7,967 | 22,361 | (308)
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 | 1,266 |  |  |  | 1,266 |
Other comprehensive income (loss), net of tax | (12) |  |  |  |  | (12)
Dividends on common stock | (1,168) |  |  |  | (1,168) |
Issuance of common stock, net | 111 |  |  | 111 |  |
Purchases of treasury stock | (180) |  | (180) |  |  |
Ending balance at Jun. 30, 2019 | 21,347 | 179 | (10,653) | 8,157 | 23,848 | (184)
Beginning balance at Mar. 31, 2019 | 21,236 | 179 | (10,653) | 8,083 | 23,795 | (168)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 635 |  |  |  | 635 |
Other comprehensive income (loss), net of tax | (16) |  |  |  |  | (16)
Dividends on common stock | (582) |  |  |  | (582) |
Issuance of common stock, net | 74 |  |  | 74 |  |
Ending balance at Jun. 30, 2019 | $ 21,347 | $ 179 | $ (10,653) | $ 8,157 | $ 23,848 | $ (184)

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