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Equity and Noncontrolling Interests - Equity Attributable to Johnson Controls and Noncontrolling Interests (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2018 | Mar. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning balance |  |  |  | $ 20,447 |
Beginning balance |  |  |  | 920 |
Beginning balance |  |  |  | 21,367 |
Foreign currency translation adjustments | $ 204 | $ 252 |  | 283 | $ (451)
Realized and unrealized gains (losses) on derivatives | (10) | (8) |  | (11) | (4)
Realized and unrealized gains (losses) on marketable securities | (2) | 11 |  | (2) | 9
Other comprehensive income (loss) | 192 | 255 |  | 270 | (446)
Comprehensive income (loss) attributable to Johnson Controls | 598 | 98 |  | 887 | (234)
Comprehensive income attributable to noncontrolling interests | 77 | 42 |  | 137 | 51
Total comprehensive income (loss) | 675 | 140 |  | 1,024 | (183)
Repurchase of ordinary shares | (49) | (119) |  | (199) | (119)
Ending balance | 20,874 |  |  | 20,874 |
Ending balance | 1,006 |  |  | 1,006 |
Ending balance | 21,880 |  |  | 21,880 |
Net income attributable to Johnson Controls | 438 | (148) |  | 668 | 181
Equity Attributable to Johnson Controls |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning balance | 20,535 | 19,577 | $ 24,118 | 20,447 | 24,118
Foreign currency translation adjustments | 168 | 241 |  |  | (418)
Realized and unrealized gains (losses) on derivatives | (6) | (6) |  |  | (6)
Realized and unrealized gains (losses) on marketable securities | (2) | 11 |  |  | 9
Other comprehensive income (loss) | 160 | 246 |  | 219 | (415)
Comprehensive income (loss) attributable to Johnson Controls | 598 | 98 |  | 887 | (234)
Cash dividends - ordinary shares | (240) | (235) |  | (482) | (471)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders | 0 | 0 |  | 0 | 0
Repurchase of ordinary shares | (49) | (119) |  | (199) | (119)
Change In noncontrolling interest share | 0 | 0 |  | 0 | 0
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  | 179 | 0
Spin-off of Adient | 0 | (18) | (4,020) | 0 | 4,038
Other, including options exercised | 30 | 85 |  | (42) | (132)
Ending balance | 20,874 | 19,388 | 19,577 | 20,874 | 19,388
Net income attributable to Johnson Controls | 438 | (148) |  | 668 | 181
Equity Attributable to Noncontrolling Interest |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning balance | 965 | 819 | 972 | 920 | 972
Income attributable to noncontrolling interests | 33 | 25 |  | 61 | 61
Foreign currency translation adjustments | 31 | 10 |  | 47 | (25)
Realized and unrealized gains on derivatives | 1 | (2) |  | 2 | 2
Realized and unrealized gains on marketable securities | 0 | 0 |  | 0 | 0
Other comprehensive income (loss) | 32 | 8 |  | 49 | (23)
Comprehensive income attributable to noncontrolling interests | 65 | 33 |  | 110 | 38
Cash dividends - ordinary shares | 0 | 0 |  | 0 | 0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders | (43) | (47) |  | (43) | (47)
Repurchase of ordinary shares | 0 | 0 |  | 0 | 0
Change In noncontrolling interest share | 19 | 8 |  | (19) | 12
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  | 0 | 0
Spin-off of Adient | 0 | 0 |  | 0 | 138
Other, including options exercised | 0 | 0 |  | 0 | 0
Ending balance | 1,006 | 813 | 819 | 1,006 | 813
Total Equity Excluding Redeemable Noncontrolling Interest [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning balance | 21,500 | 20,396 | 25,090 | 21,367 | 25,090
Net income | 471 | (123) |  | 729 | 242
Foreign currency translation adjustments | 199 | 251 |  | 273 | (443)
Realized and unrealized gains (losses) on derivatives | (5) | (8) |  | (3) | (4)
Realized and unrealized gains (losses) on marketable securities | (2) | 11 |  | (2) | 9
Other comprehensive income (loss) | 192 | 254 |  | 268 | (438)
Total comprehensive income (loss) | 663 | 131 |  | 997 | (196)
Cash dividends - ordinary shares | (240) | (235) |  | (482) | (471)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders | (43) | (47) |  | (43) | (47)
Repurchase of ordinary shares | (49) | (119) |  | (199) | (119)
Change In noncontrolling interest share | 19 | 8 |  | (19) | 12
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  | 179 | 0
Spin-off of Adient | 0 | (18) |  | 0 | 4,176
Other, including options exercised | 30 | 85 |  | (42) | (132)
Ending balance | 21,880 | 20,201 | $ 20,396 | 21,880 | 20,201
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 | 168 | 241 |  |  | (418)
Realized and unrealized gains (losses) on derivatives | (6) | (6) |  |  | (6)
Realized and unrealized gains (losses) on marketable securities | (2) | 11 |  |  | 9
Other comprehensive income (loss) | 160 | 246 |  | 219 | (415)
Comprehensive income (loss) attributable to Johnson Controls | 598 | 98 |  | 887 | (234)
Comprehensive income attributable to noncontrolling interests | 0 | 0 |  | 0 | 0
Total comprehensive income (loss) | 598 | 98 |  | 887 | (234)
Ending balance | 20,874 |  |  | 20,874 |
Ending balance | 0 |  |  | 0 |
Ending balance | 20,874 |  |  | 20,874 |
Net income attributable to Johnson Controls | $ 438 | $ (148) |  | 668 | $ 181
Parent Company [Member] | Equity Attributable to Johnson Controls |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Foreign currency translation adjustments |  |  |  | 226 |
Realized and unrealized gains (losses) on derivatives |  |  |  | (5) |
Realized and unrealized gains (losses) on marketable securities |  |  |  | $ (2) |

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