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Equity and Noncontrolling Interests - Equity Attributable to Johnson Controls and Noncontrolling Interests (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning balance | $ 20,447 |
Beginning balance | 920 |
Beginning balance | 21,367 |
Foreign currency translation adjustments | 79 | $ (703)
Realized and unrealized gains (losses) on derivatives | (1) | 4
Realized and unrealized losses on marketable securities | 0 | (2)
Other comprehensive income (loss) | 78 | (701)
Comprehensive income (loss) attributable to Johnson Controls | 289 | (332)
Comprehensive income attributable to noncontrolling interests | 60 | 9
Total comprehensive income (loss) | 349 | (323)
Repurchase of ordinary shares | (150) | 0
Ending balance | 20,535 |
Ending balance | 965 |
Ending balance | 21,500 |
Net income attributable to Johnson Controls | 230 | 329
Equity Attributable to Johnson Controls |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning balance | 20,447 | 24,118
Foreign currency translation adjustments | 58 | (659)
Realized and unrealized gains (losses) on derivatives | 1 | 0
Realized and unrealized losses on marketable securities | 0 | (2)
Other comprehensive income (loss) | 59 | (661)
Comprehensive income (loss) attributable to Johnson Controls | 289 | (332)
Cash dividends - ordinary shares | (242) | (236)
Repurchase of ordinary shares | (150) | 0
Change In noncontrolling interest share | 0 | 0
Spin-off of Adient | 0 | (4,020)
Other, including options exercised | 12 | 47
Ending balance | 20,535 | 19,577
Net income attributable to Johnson Controls | 230 | 329
Equity Attributable to Noncontrolling Interest |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning balance | 920 | 972
Income attributable to noncontrolling interests | 28 | 36
Foreign currency translation adjustments | 16 | (35)
Realized and unrealized gains on derivatives | 1 | 4
Realized and unrealized gains on marketable securities | 0 | 0
Other comprehensive income (loss) | 17 | (31)
Comprehensive income attributable to noncontrolling interests | 45 | 5
Cash dividends - ordinary shares | 0 | 0
Repurchase of ordinary shares | 0 | 0
Change In noncontrolling interest share | 0 | (20)
Spin-off of Adient | 0 | (138)
Other, including options exercised | 0 | 0
Ending balance | 965 | 819
Total Equity Excluding Redeemable Noncontrolling Interest [Member] |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning balance | 21,367 | 25,090
Net income | 258 | 365
Foreign currency translation adjustments | 74 | (694)
Realized and unrealized gains (losses) on derivatives | 2 | 4
Realized and unrealized losses on marketable securities | 0 | (2)
Other comprehensive income (loss) | 76 | (692)
Total comprehensive income (loss) | 334 | (327)
Cash dividends - ordinary shares | (242) | (236)
Repurchase of ordinary shares | (150) | 0
Change In noncontrolling interest share | 0 | (20)
Spin-off of Adient | 0 | (4,158)
Other, including options exercised | 12 | 47
Ending balance | 21,500 | 20,396
Parent Company [Member] |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning balance | 20,447 |
Beginning balance | 0 |
Beginning balance | 20,447 |
Foreign currency translation adjustments |  | (659)
Realized and unrealized gains (losses) on derivatives | 1 | 0
Realized and unrealized losses on marketable securities | 0 | (2)
Other comprehensive income (loss) | 59 | (661)
Comprehensive income (loss) attributable to Johnson Controls | 289 | (332)
Comprehensive income attributable to noncontrolling interests | 0 | 0
Total comprehensive income (loss) | 289 | (332)
Ending balance | 20,535 |
Ending balance | 0 |
Ending balance | 20,535 |
Net income attributable to Johnson Controls | 230 | 329
Parent Company [Member] | Equity Attributable to Johnson Controls |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Foreign currency translation adjustments | 58 |
Adjustments for New Accounting Pronouncement [Member] | Equity Attributable to Johnson Controls |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets | 179 | 0
Adjustments for New Accounting Pronouncement [Member] | Equity Attributable to Noncontrolling Interest |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets | 0 | 0
Adjustments for New Accounting Pronouncement [Member] | Total Equity Excluding Redeemable Noncontrolling Interest [Member] |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets | $ 179 | $ 0

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