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Merger Transaction Fair Value of Consideration Transferred (Details) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
Sep. 02, 2016 USD ($) $ / shares shares | Sep. 30, 2017 USD ($) $ / shares | Sep. 30, 2016 USD ($) $ / shares shares
Tyco share consolidation ratio | 0.955 |  | 0.955
Ordinary shares, par value | $ / shares | $ 1.00 | $ 0.01 | $ 0.01
Business Combination, Consideration Transferred per Share For Share Election | $ / shares | $ 5.7293 |  |
Business Combination, Consideration Transferred, Shares, For Share Election | shares | 0.8357 |  |
Business Combination, Consideration Transferred per Share | $ / shares | $ 34.88 |  | $ 34.88
Cash consideration paid to JCI Inc. shareholders | $ | $ 3,864 | $ 3,900 | $ 3,864
Percent Ownership by Shareholders of Acquiror Subsequent to Acquisition | 56.00% |  |
Percent Ownership by Shareholders of Acquiree Subsequent to Acquisition | 44.00% |  |
Total fair value of consideration transferred | $ | $ 19,671 | $ 19,700 |
Fair value of Tyco equity awards | $ | 224 |  |
Fair Value of Acquiree Equity Awards not Earned as of Merger Date | $ | $ 101 |  |
Number of Tyco shares outstanding at September 2, 2016 | shares | 427,181,743 |  | 427,181,743
Tyco ordinary shares outstanding following the share consolidation and immediately prior to the Merger | shares | 407,958,565 |  | 407,958,565
JCI Inc. converted share price (1) | $ / shares | $ 47.67 |  |
Fair value of equity portion of the Merger consideration | $ | $ 19,447 |  |
Acquiror Closing Share Price | $ / shares | $ 45.45 |  |
JCI Inc. market capitalization at Merger date | $ | $ 29,012 |  |
Reduction in shares due to cash consideration paid by Tyco | shares | 110,800,000 |  | (110,800,000)
Tyco Merger [Member] |  |  |
Ordinary shares, par value | $ / shares | $ 1.00 |  |

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