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Statements of Consolidated Equity (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Statement Of Stockholders Equity [Abstract]
Dividend per common share	$ 1.05	$ 0.95	$ 1.23
Accumulated other comprehensive loss	$ (410)	$ (291)
Unrecognized prior service costs (credits)	2	(3)
Net unrealized translation loss	(408)	(328)
Available-for-sale securities unrealized gain	0	34
Income tax benefits resulting from the exercise of stock options	$ 1	$ 1	$ 4
Common shares issued (in shares)	336,188	360,468	42,861
Common shares repurchased (in shares)	2,637,054

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Amount, after tax, of accumulated unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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