Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2009	Jun. 30, 2011	Jun. 30, 2010
Income Available to Common Shareholders
Basic income available to common shareholders	$ 357	$ 418		$ 1,086	$ 1,042
Interest expense, net of tax	1	1		2	4
Diluted income available to common shareholders	$ 358	$ 419		$ 1,088	$ 1,046
Weighted Average Shares Outstanding
Basic weighted average shares outstanding	678.6	672.7		677.1	671.6
Effect of dilutive securities:
Stock options	8.7	6.2		8.6	6.1
Equity units	3.9	4.5		4.3	4.5
Convertible senior notes		0.1			0.1
Diluted weighted average shares outstanding	691.2	683.5		690.0	682.3
Antidilutive Securities
Options to purchase common shares		0.5			0.5
Earnings Per Share (Textuals)
Interest rate on convertible senior notes	6.50%	6.50%	6.50%
Dividend declared	$ 0.16	$ 0.13		$ 0.48	$ 0.39

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented.

+ References

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-Name Statement of Financial Accounting Standard (FAS)
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Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
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The effective interest rate on the liability component of convertible debt instrument which may be settled in cash upon conversion, including partial cash settlement.

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Debt securities outstanding shall be assumed to have been converted at the beginning of the period (or at time of issuance, if later), and the resulting common shares shall be included in common shares used to calculate diluted earnings per shares. The dilutive effect of convertible debt securities shall be reflected in diluted Earnings Per Share by application of the if-converted method.

+ References

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Contracts and securities that allow the holder to buy equity units from the company.

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Aggregate awards of share options and nonvested shares to be issued to an employee under a share-based compensation arrangement are considered options for purposes of computing diluted earnings per share. Such share-based awards shall be considered to be outstanding as of the grant date for purposes of computing diluted earnings per share even though their exercise may be contingent upon vesting. Those share-based awards are included in the diluted Earnings Per Share (EPS) computation even if the employee may not receive (or be able to sell) the stock until some future date. Accordingly, all shares to be issued shall be included in computing diluted EPS if the effect is dilutive. The dilutive effect of share-based compensation arrangements shall be computed using the treasury stock method. If the equity share options or other equity instruments are outstanding for only part of a period, the shares issuable shall be weighted to reflect the portion of the period during which the equity instruments were outstanding.

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In computing the dilutive effect of convertible debt, the earnings per share numerator is adjusted to add back the after-tax amount of interest recognized in the period associated with any convertible debt.

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The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes.

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Net Income (Loss) Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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The average number of shares issued and outstanding that are used in calculating diluted EPS, determined based on the timing of issuance of shares in the period.

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Number of [basic] shares, after adjustment for contingently issuable shares and other shares not deemed outstanding, determined by relating the portion of time within a reporting period that common shares have been outstanding to the total time in that period.

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