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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, 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 | 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
Balance at beginning of period at Dec. 31, 2017 | 36,200 | 14 | 25,371 | 17,627 | (8,011) | 1,199
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Adoption of accounting standards (Note 1) | (1,144) |  |  | (1,046) | (98) |
Net income | 1,040 |  |  | 1,046 |  | (6)
Other comprehensive income | 27 |  |  |  | 28 | (1)
Purchase of common stock | (100) |  | (44) | (56) |  |
Cash dividends paid on common stock | (536) |  |  | (536) |  |
Dividends to noncontrolling interests | (30) |  |  |  |  | (30)
Other | 1 |  | 10 | (7) |  | (2)
Balance at end of period at Mar. 31, 2018 | $ 35,458 | $ 14 | $ 25,337 | $ 17,028 | $ (8,081) | $ 1,160

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