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Earnings Per Share - Earnings Per Share (Detail) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share [Abstract]
Income from continuing operations	$ 327	$ 159
Income from discontinued operations	124	0
Basic and diluted income available to shareholders	$ 451	$ 159
Weighted Average Shares Outstanding
Basic weighted average shares outstanding	723.1	769.9
Effect of dilutive securities:
Stock options, unvested restricted stock and unvested performance share awards	3.4	4.1
Diluted weighted average shares outstanding	726.5	774.0
Antidilutive Securities
Options to purchase shares	0.2	0.2

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