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Earnings Per Share - Earnings Per Share (Detail) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Income (loss) from continuing operations	$ 574	$ (182)	$ 1,244	$ 190
Income from discontinued operations	0	0	124	0
Basic and diluted income (loss) available to shareholders	$ 574	$ (182)	$ 1,368	$ 190
Weighted Average Shares Outstanding
Basic weighted average shares outstanding	714.5	744.0	718.2	756.3
Effect of dilutive securities:
Stock options, unvested restricted stock and unvested performance share awards	5.2	0.0	4.3	2.6
Diluted weighted average shares outstanding	719.7	744.0	722.5	758.9
Antidilutive Securities
Options to purchase shares	0.0	0.0	0.1	1.6
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Earnings Per Share, Potentially Dilutive Securities		1.5 million

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration