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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
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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