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Equity and Noncontrolling Interests Equity Attributable to Johnson Controls and Noncontrolling Interests (Additional Information) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2016 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | May 01, 2019 | Mar. 31, 2019
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  | $ 32 |  |  |  |
Stock repurchase program, authorized amount |  |  |  | 1,000 |  |  |  | $ 8,500
Common Stock, Value, Issued |  |  |  | $ 8 | $ 10 |  |  |
Cash dividends ordinary, per share |  |  |  | $ 1.04 | $ 1.04 | $ 1.00 |  |
Spin-off of Adient |  |  |  |  |  | $ (4,038) |  |
Repurchases of ordinary shares |  |  |  |  | $ 300 | 651 |  |
Document Period End Date |  |  |  | Sep. 30, 2019 |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  | $ 4,600 |  |  |  |
Share tender offer to purchase up to $4.0 billion of ordinary shares |  |  |  |  |  |  | $ 4,000 |
Share tender offer, price per share | $ 39.25 |  |  |  |  |  |  |
Share Tender Offer, Accepted Shares | 102 |  |  |  |  |  |  |
Ordinary shares, par value |  |  |  | $ 0.01 | $ 0.01 |  |  |
Stock Repurchased and Retired During Period Value Open Market |  |  |  | $ 1,948 |  |  |  |
Stock Repurchased and Retired During Period Value Tender Offer |  |  |  | 4,035 |  |  |  |
Parent |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Accounting Pronouncement |  |  |  |  | $ 179 |  |  |
Spin-off of Adient |  |  | $ 4,000 |  |  | (4,038) |  |
Repurchases of ordinary shares |  |  |  | (5,983) | $ (300) | $ (651) |  |
Minimum |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Share tender offer, price per share | $ 36.00 |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Share tender offer, price per share | $ 40.00 |  |  |  |  |  |  |
Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Accounting Pronouncement |  |  |  | (45) |  |  |  |
Accounting Standards Update 2014-09 [Member] | Parent |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Accounting Pronouncement |  | $ (45) |  | (45) |  |  |  |
Accounting Standards Update 2016-16 [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Accounting Pronouncement |  |  |  | (546) |  |  |  |
Accounting Standards Update 2016-16 [Member] | Parent |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Accounting Pronouncement |  | $ (546) |  | $ (546) |  |  |  |

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