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Consolidated Statement of Changes in Equity (Unaudited) (USD $) In Millions, except Share data | Total | General Partner [Member] | Limited Partner [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 |  |
Net income | 101 | 1 | 48 | 0 | 49 | 52
Other comprehensive income, net of tax | 107 | 1 | 79 | 0 | 80 | 27
Cancellation of treasury units |  |  |  | (1,137,200) |  |
Cancellation of treasury units, at cost | 0 | 0 | (12) | 12 | 0 | 0
Partnership contributions | 510 | 10 | 500 | 0 | 510 | 0
Partnership distributions | (10) | 0 | (10) | 0 | (10) | 0
Investment segment distributions | (17) | 0 | 0 | 0 | 0 | (17)
Change in subsidiary equity and other | 1 | 0 | 2 | 0 | 2 | (1)
Equity at Mar. 31, 2012 | $ 8,525 | $ (259) | $ 4,645 | $ 0 | $ 4,386 | $ 4,139
Treasury units at Mar. 31, 2012 | 0 |  |  | 0 |  |

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