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Consolidated Statement of Changes in Equity (Unaudited) (USD $) In Millions, except Share data, unless otherwise specified | Total | General partner [Member] | Limited partners [Member] | Treasury Stock [Member] | Parent [Member] | Noncontrolling Interest [Member]
--- | --- | --- | --- | --- | --- | ---
Equity at Dec. 31, 2011 | $ 7,833 | $ (271) | $ 4,038 | $ (12) | $ 3,755 | $ 4,078
Treasury units at Dec. 31, 2011 | 1,137,200 |  |  | 1,137,200 |  |
Increase (Decrease) in Partners' Capital [Roll Forward] |  |  |  |  |  |
Net income | 551 | 6 | 283 | 0 | 289 | 262
Other comprehensive income | (3) | 0 | (1) | 0 | (1) | (2)
Cancellation of treasury units | 0 | 0 | (12) | 12 | 0 | 0
Cancellation of treasury units (in units) |  |  |  | (1,137,200) |  |
Partnership contributions | 510 | 10 | 500 | 0 | 510 | 0
Partnership distributions | (20) | 0 | (20) | 0 | (20) | 0
Investment segment distributions | (79) | 0 | 0 | 0 | 0 | (79)
Acquisition of CVR | 910 | 0 | 0 | 0 | 0 | 910
Changes in subsidiary equity and other | 0 | 0 | 2 | 0 | 2 | (2)
Equity at Jun. 30, 2012 | $ 9,702 | $ (255) | $ 4,790 | $ 0 | $ 4,535 | $ 5,167
Treasury units at Jun. 30, 2012 | 0 |  |  | 0 |  |

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