| Change in equity attributable to non-controlling interests |
| Note 12—Noncontrolling Interests | | | | | | | | | | | | | | | | | Activity attributable to common stockholders’ equity and noncontrolling interests for the first six months of 2013 and 2012 was as follows: | | | | | | | | | | | | | | | | | | | Millions of Dollars | | | | 2013 | | 2012 | | | | Common Stockholders’ Equity | | Non-Controlling Interest | | Total Equity | | Common Stockholders’ Equity | | Non-Controlling Interest | | Total Equity | | | | | | | | | | | | | | | | | Balance at January 1 | $ | 47,987 | | 440 | | 48,427 | | 65,239 | | 510 | | 65,749 | | Net income | | 4,189 | | 27 | | 4,216 | | 5,204 | | 40 | | 5,244 | | Dividends | | (1,629) | | - | | (1,629) | | (1,661) | | - | | (1,661) | | Repurchase of company | | | | | | | | | | | | | | | common stock | | - | | - | | - | | (4,949) | | - | | (4,949) | | Distributions to noncontrolling | | | | | | | | | | | | | | | interests | | - | | (43) | | (43) | | - | | (47) | | (47) | | Separation of Downstream | | | | | | | | | | | | | | | business | | - | | - | | - | | (18,641) | | (31) | | (18,672) | | Other changes, net* | | (2,039) | | - | | (2,039) | | 779 | | - | | 779 | | Balance at June 30 | $ | 48,508 | | 424 | | 48,932 | | 45,971 | | 472 | | 46,443 | | *Includes components of other comprehensive income, which are disclosed separately in our consolidated statement of comprehensive income. |
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