Income Taxes (Schedule Of Unrecognized Tax Benefits) (Details) (USD $) In Millions	12 Months Ended
Sep. 30, 2011	Sep. 30, 2010
Income Taxes [Abstract]
Beginning balance, at October 1	$ 170	$ 159
Additions for current year tax positions	13	48
Additions for prior year tax positions	27	20
Reduction for prior year tax positions	(22)	(34)
Reduction for settlements with tax authorities	(7)	(10)
Reduction for expirations of statue of limitations	(19)	(13)
Ending balance, at September 30	$ 162	$ 170

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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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The gross amount of decreases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns.

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The gross amount of decreases in unrecognized tax benefits resulting from settlements with taxing authorities.

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The gross amount of increases in unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return for the current period, excluding amounts pertaining to examined tax returns.

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The gross amount of increases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns.

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The gross amount of decreases in unrecognized tax benefits resulting from lapses of the applicable statutes of limitations.

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