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Consolidated Statements of Financial Position (Parenthetical) $ in Millions | Sep. 30, 2017 € / shares | Sep. 30, 2017 USD ($) $ / shares shares | Sep. 30, 2016 € / shares | Sep. 30, 2016 USD ($) $ / shares shares
--- | --- | --- | --- | ---
Allowance for doubtful accounts | $ |  | $ 182 |  | $ 173
Ordinary shares, par value | $ / shares |  | $ 0.01 |  | $ 0.01
Ordinary shares authorized |  | 2,000,000,000 |  | 2,000,000,000
Ordinary shares issued |  | 945,055,276 |  | 936,247,911
Preferred shares authorized |  | 200,000 |  | 200,000
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 |  | 17,080,302 |  | 452,083
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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