Asset Impairment Charge (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Sep. 30, 2012	Sep. 30, 2011
Asset Impairment Charges And Exit Costs [Line Items]
Asset impairment charge	$ 146
Asset impairment charge, per share	$ 0.16
Foreign currency translation adjustment, before tax	145	(498)
Gruma S.A.B. de C.V. [Member]
Asset Impairment Charges And Exit Costs [Line Items]
Foreign currency translation adjustment, before tax	$ 123

- Definition

Before tax and net of reclassification adjustments of the change in the balance sheet adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency of the reporting entity. Also includes the following: gain (loss) on foreign currency forward exchange contracts; foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements; and gain (loss) on a derivative instrument or nonderivative financial instrument that may give rise to a foreign currency transaction gain (loss) that has been designated and qualified as a hedging instrument for hedging of the foreign currency exposure of a net investment in a foreign operation.

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