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Equity and Noncontrolling Interests Equity Attributable to Johnson Controls and Noncontrolling Interests (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Equity [Line Items] |  |  |
Payments for Repurchase of Common Stock | $ 651 | $ 501 | $ 1,362
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning balance | 24,118 | 10,335 | 11,270
Beginning balance | 972 |  |
Beginning balance | 25,090 |  |
Net income (loss) | 1,611 | (868) | 1,563
Foreign currency translation adjustments | 103 | (94) | (825)
Realized and unrealized gains (losses) on marketable securities | 5 | (1) | 0
Pension and postretirement plans | 0 | (1) | (10)
Other comprehensive income (loss) | 94 | (87) | (845)
Comprehensive income (loss) attributable to Johnson Controls | 1,710 | (964) | 743
Comprehensive income attributable to noncontrolling interest | 203 | 225 | 91
Total comprehensive income (loss) | 1,913 | (739) | 834
Result of contribution of Johnson Controls, Inc. to Johnson Controls International plc | 15,800 | 15,808 |
Cash dividends - common stock | (938) | (752) | (681)
Repurchases of common stock | 651 | 501 | 1,362
Change in noncontrolling interest share | 8 |  |
Spin-off of Adient | 4,038 |  |
Other, including options exercised | (246) | (192) | (365)
Ending balance | 20,447 | 24,118 | 10,335
Ending balance | 920 | 972 |
Ending balance | 21,367 | 25,090 |
Parent |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning balance | 24,118 | 10,335 | 11,270
Net income (loss) | 1,611 | (868) | 1,563
Foreign currency translation adjustments | 108 | (105) | (799)
Realized and unrealized gains (losses) on derivatives | (14) | 11 | (11)
Realized and unrealized gains (losses) on marketable securities | 5 | (1) |
Pension and postretirement plans |  | (1) | (10)
Other comprehensive income (loss) | 99 | (96) | (820)
Comprehensive income (loss) attributable to Johnson Controls | 1,710 | (964) | 743
Result of contribution of Johnson Controls, Inc. to Johnson Controls International plc |  | 15,808 |
Cash dividends - common stock | (938) | (752) | (681)
Dividends attributable to noncontrolling interests | 0 | 0 | 0
Repurchases of common stock | (651) | (501) | (1,362)
Change in noncontrolling interest share | 0 | 0 | 0
Spin-off of Adient | (4,038) |  |
Other, including options exercised | 246 | 192 | 365
Ending balance | 20,447 | 24,118 | 10,335
Noncontrolling Interest [Member] |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Spin-off of Adient | (138) |  |
Nonredeemable Noncontrolling Interest |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning balance | 972 | 163 | 251
Income from continuing operations attributable to noncontrolling interests | 164 | 168 | 65
Foreign currency translation adjustments | (18) | 9 | (3)
Realized and unrealized gains (losses) on derivatives | 1 | (1) | 0
Realized and unrealized gains (losses) on marketable securities | 0 | 0 |
Pension and postretirement plans |  | 0 | 0
Other comprehensive income (loss) | (17) | 8 | (3)
Comprehensive income attributable to noncontrolling interest | 147 | 176 | 62
Result of contribution of Johnson Controls, Inc. to Johnson Controls International plc |  | 0 |
Cash dividends - common stock | 0 | 0 | 0
Dividends attributable to noncontrolling interests | (56) | (93) | (57)
Repurchases of common stock | 0 | 0 | 0
Change in noncontrolling interest share | (5) | 726 | (93)
Other, including options exercised | 0 | 0 | 0
Ending balance | 920 | 972 | 163
Stockholders' Equity, Total |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning balance | 25,090 | 10,498 | 11,521
Net Income (loss) | 1,775 | (700) | 1,628
Foreign currency translation adjustments | 90 | (96) | (802)
Realized and unrealized gains (losses) on derivatives | (13) | 10 | (11)
Realized and unrealized gains (losses) on marketable securities | 5 | (1) |
Pension and postretirement plans |  | (1) | (10)
Other comprehensive income (loss) | 82 | (88) | (823)
Total comprehensive income (loss) | 1,857 | (788) | 805
Result of contribution of Johnson Controls, Inc. to Johnson Controls International plc |  | 15,808 |
Cash dividends - common stock | (938) | (752) | (681)
Dividends attributable to noncontrolling interests | (56) | (93) | (57)
Repurchases of common stock | (651) | (501) | (1,362)
Change in noncontrolling interest share | (5) | 726 | (93)
Spin-off of Adient | (4,176) |  |
Other, including options exercised | 246 | 192 | 365
Ending balance | $ 21,367 | $ 25,090 | $ 10,498

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