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Reconciliation of the numerators and denominators (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Income Available to Ordinary Shareholders
Income from continuing operations	$ 2,162	$ 1,654	$ 732
Income (loss) from discontinued operations	0	(43)	(1,600)
Basic and diluted income (loss) available to shareholders	$ 2,162	$ 1,611	$ (868)
Weighted Average Shares Outstanding
Basic weighted average shares outstanding	925.7	935.3	667.4
Stock options, unvested restricted stock and unvested performance share awards	6.0	9.3	5.2
Diluted weighted average shares outstanding	931.7	944.6	672.6
Antidilutive Securities
Options to purchase common shares	1.5	0.2	0.0

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