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Consolidated Statements of Shareholders' Equity Attributable to Johnson Controls Ordinary Shareholders (Parenthetical) - $ / shares
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Cash dividends common, per share $ 1.04 $ 1.00 $ 1.16
Retained Earnings      
Cash dividends common, per share $ 1.04 $ 1.00 $ 1.16