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Consolidated Statements of Stockholders' Equity (Parenthetical) (Comprehensive Income [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Oct. 31, 2011
Comprehensive Income [Member]
Postretirement benefit adjustment, income tax benefit	$ 430

Tax effects of the increase (decrease) to accumulated comprehensive income during the period related to benefit plans. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

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