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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 | 4,781 |  |  | 4,819 |  | (38)
Other comprehensive loss | 114 |  |  |  | 131 | (17)
Issuance of common stock | 290 |  | 290 |  |  |
Purchase of common stock | (300) |  | (167) | (133) |  |
Exercise of common stock warrants | 29 | 1 | 28 |  |  |
Stock based compensation | (32) |  | (24) | (8) |  |
Cash dividends paid on common stock | (1,178) |  |  | (1,178) |  |
Dividends to noncontrolling interests | (17) |  |  |  |  | (17)
Other | (7) |  | 0 |  |  | (7)
Balance at end of period at Jun. 30, 2016 | 44,003 | 16 | 27,734 | 23,785 | (7,905) | 373
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 2,850 |  |  |  |  |
Other comprehensive loss | 152 |  |  |  |  |
Cash dividends paid on common stock | (591) |  |  |  |  |
Balance at end of period at Jun. 30, 2016 | 44,003 | 16 | 27,734 | 23,785 | (7,905) | 373
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 | 4,280 |  |  | 4,268 |  | 12
Other comprehensive loss | (39) |  |  |  | (39) |
Purchase of common stock | (1,496) |  | (760) | (736) |  |
Exercise of common stock warrants | 4 |  | 4 |  |  |
Stock based compensation | 85 |  | 101 | (16) |  |
Cash dividends paid on common stock | (1,137) |  |  | (1,137) |  |
Dividends to noncontrolling interests | (8) |  |  |  |  | (8)
Other | (39) |  | 0 |  |  | (39)
Balance at end of period at Jun. 30, 2017 | 45,725 | 15 | 26,328 | 28,547 | (9,369) | 204
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 1,663 |  |  |  |  |
Other comprehensive loss | (118) |  |  |  |  |
Cash dividends paid on common stock | (564) |  |  |  |  |
Balance at end of period at Jun. 30, 2017 | $ 45,725 | $ 15 | $ 26,328 | $ 28,547 | $ (9,369) | $ 204

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