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Stock-based Compensation (Details) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2020 USD ($) Plan $ / shares shares	Sep. 30, 2019 USD ($) $ / shares	Sep. 30, 2018 USD ($) $ / shares	Jan. 23, 2013 shares
Stock Based Compensation Activity [Line Items]
Shares authorized for issuance under 2012 Plan (in shares) | shares				76
Shares available for issuance under the 2012 Plan (in shares) | shares	27
Number of share-based compensation plans | Plan	4
Compensation cost charged against income from share-based compensation plans	$ 66	$ 103	$ 89
Total income tax benefit recognized for share-based compensation arrangements	16	26	22
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options	1	6	3
Proceeds from the exercise of stock options	$ 75	$ 171	$ 66
Employee Stock Option
Stock Based Compensation Activity [Line Items]
Expiration period for stock options	10 years
Weighted-average grant-date fair value of options granted | $ / shares	$ 7.29	$ 5.56	$ 7.04
Total intrinsic value of options exercised	$ 30	$ 73	$ 38
Proceeds from the exercise of stock options	75	171	66
Total unrecognized compensation cost related to nonvested share-based compensation arrangements granted	$ 9
Weighted average period over which unrecognized compensation cost is expected to be recognized	1 year 9 months 18 days
Stock Appreciation Rights (SARs)
Stock Based Compensation Activity [Line Items]
Payments towards exercise of SARs granted	$ 2	$ 3	$ 3
Restricted (Nonvested) Stock
Stock Based Compensation Activity [Line Items]
Total unrecognized compensation cost related to nonvested share-based compensation arrangements granted	$ 81
Weighted average period over which unrecognized compensation cost is expected to be recognized	2 years 1 month 6 days
Performance Shares
Stock Based Compensation Activity [Line Items]
Total unrecognized compensation cost related to nonvested share-based compensation arrangements granted	$ 25
Weighted average period over which unrecognized compensation cost is expected to be recognized	1 year 9 months 18 days
Maximum | Employee Stock Option
Stock Based Compensation Activity [Line Items]
Vesting period	3 years
Maximum | Restricted (Nonvested) Stock
Stock Based Compensation Activity [Line Items]
Vesting period	3 years

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