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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, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share [Abstract]
Income from continuing operations	$ 11	$ 343	$ 392	$ 670
Income from discontinued operations	0	0	0	124
Basic and diluted income (loss) available to shareholders	$ 11	$ 343	$ 392	$ 794
Weighted Average Shares Outstanding
Basic weighted average shares outstanding	699.1	717.1	701.8	720.1
Effect of dilutive securities:
Stock options, unvested restricted stock and unvested performance share awards	3.6	4.2	4.4	3.8
Diluted weighted average shares outstanding	702.7	721.3	706.2	723.9
Antidilutive Securities
Options to purchase shares	0.3	0.0	0.2	0.1

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