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Consolidated Statements of Financial Position (Parenthetical) $ in Millions	Sep. 30, 2019 USD ($) $ / shares shares	Sep. 30, 2019 € / shares	Sep. 30, 2018 USD ($) $ / shares shares	Sep. 30, 2018 € / shares
Allowance for doubtful accounts | $	$ 173		$ 169
Ordinary shares, par value | $ / shares	$ 0.01		$ 0.01
Ordinary shares authorized	2,000,000,000		2,000,000,000
Ordinary shares issued	804,495,430		950,969,965
Preferred shares authorized	200,000,000		200,000,000
Preferred shares issued	0		0
Preferred shares, par or stated value per share | $ / shares	$ 0.01		$ 0.01
Ordinary shares held in treasury, as cost	26,864,793		25,963,004
Common Class A [Member]
Ordinary shares, par value | € / shares		€ 1.00		€ 1.00
Ordinary shares authorized	40,000		40,000
Ordinary shares issued	0		0

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