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Stock-Based Compensation (Summary Of Stock Options) (Details) - Stock Options [Member] $ / shares in Units, $ in Millions	12 Months Ended
	Sep. 30, 2017 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Shares Under Option - Outstanding, October 1, 2016 | shares	11,191,656
Shares Under Option - Exercised | shares	(5,172,485)
Shares Under Option - Forfeited or expired | shares	(87,361)
Shares Under Option - Granted | shares	1,615,708
Shares Under Option - Outstanding, September 30, 2017 | shares	7,547,518
Weighted Average Exercise Price Per Share - Outstanding, October 1, 2016 | $ / shares	$ 33.74
Weighted Average Exercise Price Per Share - Exercised | $ / shares	31.17
Weighted Average Exercise Price Per Share - Forfeited or expired | $ / shares	53.18
Weighted Average Exercise Price Per Share - Granted | $ / shares	58.34
Weighted Average Exercise Price Per Share - Outstanding, September 30, 2017 | $ / shares	$ 40.54
Weighted Average Remaining Contractual Life (in Years) - Outstanding, September 30, 2017	7 years
Aggregate Intrinsic Value - Outstanding, September 30, 2017 | $	$ 226
Shares Under Option - Exercisable, September 30, 2017 | shares	4,152,777
Weighted Average Exercise Price Per Share - Exercisable at September 30, 2017 | $ / shares	$ 32.15
Weighted Average Remaining Contractual Life (in Years) - Exercisable, September 30, 2017	6 years
Aggregate Intrinsic Value - Exercisable, September 30, 2017 | $	$ 159

X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

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-Publisher FASB
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-Section 50
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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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- Definition

For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Net number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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