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Reconciliation of the numerators and denominators (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Income Available to Ordinary Shareholders
Income from continuing operations	$ 1,100	$ 1,175	$ 672
Income from discontinued operations	4,574	987	939
Basic and diluted income available to shareholders	$ 5,674	$ 2,162	$ 1,611
Weighted Average Shares Outstanding
Basic weighted average shares outstanding	870.2	925.7	935.3
Stock options, unvested restricted stock and unvested performance share awards	4.1	6.0	9.3
Diluted weighted average shares outstanding	874.3	931.7	944.6
Antidilutive Securities
Options to purchase common shares	1.4	1.5	0.2

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