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New Accounting Pronouncements (Details) (USD $) In Billions	Jun. 30, 2011
New Accounting Pronouncements
Assets in trusts or funds for management or trustee fee	$ 18

The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations.

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