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Contingencies and commitments (Details) (Proposed settlement of Federal Investigation [Member], USD $) In Millions, unless otherwise specified	Sep. 30, 2012
Proposed settlement of Federal Investigation [Member]
Contingencies and Commitments (Textual) [Abstract]
Accrued liability for proposed settlement of allegations	$ 806

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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