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Investments (Aggregated Balance Sheet Summarized Financial Information for Partnerships in our Alternative Investment Portfolio (USD $) In Millions, unless otherwise specified | Sep. 30, 2011 | Sep. 30, 2010
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Investments [Abstract] |  |
Investments | $ 13,553 | $ 18,278
Total assets | 14,253 | 19,230
Total liabilities | 1,105 | 864
Partners' capital | $ 13,148 | $ 18,366

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