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Stock-based Compensation Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Stock Based Compensation Activity [Line Items]
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options	$ 6	$ 3	$ 4
Document Period End Date	Sep. 30, 2019
Compensation cost charged against income from share-based compensation plans	$ 103	$ 89	$ 122
Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted Average Option Price, Outstanding beginning balance	$ 27.39
Weighted Average Option Price, Exercised	25.20
Weighted Average Option Price, Forfeited or expired	32.43
Weighted Average Option Price, Outstanding ending balance	28.67	$ 27.39
Weighted Average Option Price, Exercisable	$ 28.59
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Shares Subject to Option, Outstanding beginning balance	626,701
Shares Subject to Option, Exercised	(245,513)
Shares Subject to Option, Forfeited or expired	(13,179)
Shares Subject to Option, Outstanding ending balance	368,009	626,701
Shares Subject to Option, Exercisable	365,829
Weighted Average Remaining Contractual Life (years), Outstanding	2 years 4 months 24 days
Weighted Average Remaining Contractual Life (years), Exercisable	2 years 4 months 24 days
Aggregate Intrinsic Value, Outstanding	$ 6
Aggregate Intrinsic Value, Exercisable	$ 6
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted Average Option Price, Outstanding beginning balance	$ 34.24
Weighted Average Option Price, Granted	33.37
Weighted Average Option Price, Exercised	27.54
Weighted Average Option Price, Forfeited or expired	37.49
Weighted Average Option Price, Outstanding ending balance	35.07	$ 34.24
Weighted Average Option Price, Exercisable	$ 34.74
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Shares Subject to Option, Outstanding beginning balance	17,836,062
Shares Subject to Option, Granted	1,741,510
Shares Subject to Option, Exercised	(6,234,755)
Shares Subject to Option, Forfeited or expired	(973,068)
Shares Subject to Option, Outstanding ending balance	12,369,749	17,836,062
Shares Subject to Option, Exercisable	9,295,813
Weighted Average Remaining Contractual Life (years), Outstanding	4 years 7 months 6 days
Weighted Average Remaining Contractual Life (years), Exercisable	3 years 4 months 24 days
Aggregate Intrinsic Value, Outstanding	$ 111
Aggregate Intrinsic Value, Exercisable	$ 87

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Stock Based Compensation Activity [Line Items]

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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.

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

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