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Condensed Consolidated Statements of Equity - USD ($) $ in Millions | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Loss [Member] | Noncontrolling Interests [Member]
--- | --- | --- | --- | --- | --- | ---
Balance at beginning of period at Dec. 31, 2015 | $ 40,323 | $ 15 | $ 27,607 | $ 20,285 | $ (8,036) | $ 452
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 1,931 |  |  | 1,953 |  | (22)
Other comprehensive income (loss) | (38) |  |  |  | (18) | (20)
Purchase of common stock | (300) |  | (167) | (133) |  |
Exercise of common stock warrants | 7 |  | 7 |  |  |
Stock based compensation | 5 |  | 15 | (10) |  |
Cash dividends paid on common stock | (587) |  |  | (587) |  |
Dividends declared or paid to noncontrolling interests | (8) |  |  |  |  | (8)
Other | (8) |  | 1 |  |  | (9)
Balance at end of period at Mar. 31, 2016 | 41,325 | 15 | 27,463 | 21,508 | (8,054) | 393
Balance at beginning of period at Dec. 31, 2016 | 44,075 | 15 | 26,983 | 26,168 | (9,330) | 239
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 2,617 |  |  | 2,608 |  | 9
Other comprehensive income (loss) | 79 |  |  |  | 80 | (1)
Exercise of common stock warrants | 4 |  | 4 |  |  |
Stock based compensation | 16 |  | 24 | (8) |  |
Cash dividends paid on common stock | (573) |  |  | (573) |  |
Other | (4) |  | 1 |  |  | (5)
Balance at end of period at Mar. 31, 2017 | $ 46,214 | $ 15 | $ 27,012 | $ 28,195 | $ (9,250) | $ 242

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