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Equity and Noncontrolling Interests - Equity Attributable to Johnson Controls and Noncontrolling Interests (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2018 | Jun. 30, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning balance |  |  |  | $ 20,447 |
Beginning balance |  |  |  | 920 |
Beginning balance |  |  |  | 21,367 |
Foreign currency translation adjustments | $ (614) | $ 285 |  | (331) | $ (166)
Realized and unrealized gains (losses) on derivatives | 1 | (9) |  | (10) | (13)
Realized and unrealized gains (losses) on marketable securities | 0 | (3) |  | (2) | 6
Other comprehensive income (loss) | (613) | 273 |  | (343) | (173)
Comprehensive income (loss) attributable to Johnson Controls | 169 | 813 |  | 1,056 | 579
Comprehensive income attributable to noncontrolling interests | 22 | 89 |  | 159 | 140
Total comprehensive income (loss) | 191 | 902 |  | 1,215 | 719
Repurchase of ordinary shares | (56) | (307) |  | (255) | (426)
Ending balance | 20,773 |  |  | 20,773 |
Ending balance | 1,036 |  |  | 1,036 |
Ending balance | 21,809 |  |  | 21,809 |
Net income attributable to Johnson Controls | 723 | 555 |  | 1,391 | 736
Equity Attributable to Johnson Controls |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning balance | 20,874 | 19,388 | $ 24,118 | 20,447 | 24,118
Foreign currency translation adjustments | (557) | 268 |  |  | (150)
Realized and unrealized gains (losses) on derivatives | 3 | (7) |  |  | (13)
Realized and unrealized gains (losses) on marketable securities | 0 | (3) |  |  | 6
Other comprehensive income (loss) | (554) | 258 |  | (335) | (157)
Comprehensive income (loss) attributable to Johnson Controls | 169 | 813 |  | 1,056 | 579
Cash dividends - ordinary shares | (240) | (234) |  | (722) | (705)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders |  |  |  | 0 | 0
Repurchase of ordinary shares | (56) | (307) |  | (255) | (426)
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 |  |  | (4,020) | 0 | (4,038)
Other, including options exercised | 26 | 71 |  | 68 | 203
Ending balance | 20,773 | 19,731 |  | 20,773 | 19,731
Net income attributable to Johnson Controls | 723 | 555 |  | 1,391 | 736
Equity Attributable to Noncontrolling Interest |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning balance | 1,006 | 813 | 972 | 920 | 972
Income attributable to noncontrolling interests | 71 | 66 |  | 132 | 127
Foreign currency translation adjustments | (44) | 3 |  | 3 | (22)
Realized and unrealized gains on derivatives | (1) | (1) |  | 1 | 1
Realized and unrealized gains on marketable securities | 0 | 0 |  | 0 | 0
Other comprehensive income (loss) | (45) | 2 |  | 4 | (21)
Comprehensive income attributable to noncontrolling interests | 26 | 68 |  | 136 | 106
Cash dividends - ordinary shares | 0 | 0 |  | 0 | 0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders |  |  |  | (43) | (47)
Repurchase of ordinary shares | 0 | 0 |  | 0 | 0
Change In noncontrolling interest share | 4 | 3 |  | 23 | (9)
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  | 0 | 0
Spin-off of Adient |  |  |  | 0 | (138)
Other, including options exercised | 0 | 0 |  | 0 | 0
Ending balance | 1,036 | 884 |  | 1,036 | 884
Total Equity Excluding Redeemable Noncontrolling Interest [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning balance | 21,880 | 20,201 | $ 25,090 | 21,367 | 25,090
Net income | 794 | 621 |  | 1,523 | 863
Foreign currency translation adjustments | (601) | 271 |  | (328) | (172)
Realized and unrealized gains (losses) on derivatives | 2 | (8) |  | (1) | (12)
Realized and unrealized gains (losses) on marketable securities | 0 | (3) |  | (2) | 6
Other comprehensive income (loss) | (599) | 260 |  | (331) | (178)
Total comprehensive income (loss) | 195 | 881 |  | 1,192 | 685
Cash dividends - ordinary shares | (240) | (234) |  | (722) | (705)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders |  |  |  | (43) | (47)
Repurchase of ordinary shares | (56) | (307) |  | (255) | (426)
Change In noncontrolling interest share | 4 | 3 |  | (23) | 9
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  | 179 | 0
Spin-off of Adient |  |  |  | 0 | 4,176
Other, including options exercised | 26 | 71 |  | (68) | (203)
Ending balance | $ 21,809 | $ 20,615 |  | 21,809 | $ 20,615
Parent Company [Member] | Equity Attributable to Johnson Controls |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Foreign currency translation adjustments |  |  |  | (331) |
Realized and unrealized gains (losses) on derivatives |  |  |  | (2) |
Realized and unrealized gains (losses) on marketable securities |  |  |  | $ (2) |

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