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Equity and Noncontrolling Interests Equity Attributable to Johnson Controls and Noncontrolling Interests (Additional Information) (Details) |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 02, 2016 USD ($) $ / shares shares | Sep. 30, 2017 USD ($) $ / shares | Sep. 30, 2016 USD ($) $ / shares | Sep. 30, 2017 USD ($) $ / shares | Sep. 30, 2016 USD ($) $ / shares shares | Sep. 30, 2015 USD ($) $ / shares | Dec. 31, 2015 USD ($)
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Stockholders Equity, Change due to Merger |  |  |  | $ 15,800,000,000 | $ 15,808,000,000 |  |
Business Combination, Consideration Transferred | $ 19,671,000,000 |  |  | 19,700,000,000 |  |  |
Business Combination, Number of Acquiree Shares Outstanding Prior to Acquisition | shares | 427,181,743 |  |  |  | 427,181,743 |  |
Common Stock, Value, Issued | $ 9 | $ 9,000,000 | $ 9,000,000 | $ 9,000,000 | $ 9,000,000 |  |
Cash dividends common, per share | $ / shares |  | $ 0.25 | $ 0.29 | $ 1.00 | $ 1.16 | $ 1.04 |
Tyco share consolidation ratio | 0.955 |  |  |  | 0.955 |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares | 407,958,565 |  |  |  | 407,958,565 |  |
Business Combination, Number of Acquiror Shares Outstanding Prior to Acquisition | shares |  |  |  |  | 638,300,000 |  |
Cash consideration paid to JCI Inc. shareholders | $ 3,864,000,000 |  |  | $ 3,900,000,000 | $ 3,864,000,000 |  |
Stockholder's equity, spin-off of Adient |  |  |  | (4,038,000,000) |  |  |
Business Combination, Consideration Transferred per Share | $ / shares | $ 34.88 |  |  |  | $ 34.88 |  |
Reduction in shares due to cash consideration paid by Tyco | shares | 110,800,000 |  |  |  | (110,800,000) |  |
Business Combination, Adjusted Number of Acquiror Shares Outstanding Prior to Acquisition | shares |  |  |  |  | 527,500,000 |  |
Common Stock, Shares, Outstanding | shares | 935,500,000 |  |  |  |  |  |
Repurchases of common stock |  |  |  | 651,000,000 | $ 501,000,000 | $ 1,362,000,000 |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  | $ 349,000,000 |  | 349,000,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, NonControlling Interest | $ 37,000,000 |  |  |  |  |  |
Post Merger Stock Repurchase Program [Member] |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  | $ 1,000,000,000 |  | 1,000,000,000 |  |
PreMerger Share Repurchase Program [Member] |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  | $ 3,650,000,000 |  | 3,650,000,000 |  |  |
Parent |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Stockholders Equity, Change due to Merger |  |  |  |  | 15,808,000,000 |  |
Stockholder's equity, spin-off of Adient |  |  |  | 4,038,000,000 |  |  |
Repurchases of common stock |  |  |  | $ (651,000,000) | $ (501,000,000) | $ (1,362,000,000) |
Hitachi Joint Venture [Member] |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value |  |  |  |  |  |  | $ 679,000,000

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