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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, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Income from continuing operations	$ 213	$ 240	$ 372	$ 347
Loss from discontinued operations	0	275	0	523
Basic and diluted income available to shareholders	$ 213	$ 515	$ 372	$ 870
Weighted Average Shares Outstanding
Basic weighted average shares outstanding	754.8	902.5	762.4	912.1
Effect of dilutive securities:
Stock options, unvested restricted stock and unvested performance share awards	2.3	3.4	3.2	3.5
Diluted weighted average shares outstanding	757.1	905.9	765.6	915.6
Antidilutive Securities
Options to purchase shares	1.4	2.2	0.8	2.4

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Amount after tax of income (loss) from continuing operations attributable to the parent.

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