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Earnings Per Share - Earnings Per Share (Detail) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Income from continuing operations	$ 343	$ 213	$ 670	$ 372
Income from discontinued operations	0	0	124	0
Basic and diluted income available to shareholders	$ 343	$ 213	$ 794	$ 372
Weighted Average Shares Outstanding
Basic weighted average shares outstanding	717.1	754.8	720.1	762.4
Effect of dilutive securities:
Stock options, unvested restricted stock and unvested performance share awards	4.2	2.3	3.8	3.2
Diluted weighted average shares outstanding	721.3	757.1	723.9	765.6
Antidilutive Securities
Options to purchase shares	0.0	1.4	0.1	0.8

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