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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, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning balance | $ 20,102 | $ 21,164 | $ 20,535 | $ 21,164 | $ 20,447
Beginning balance |  | 1,294 |  | 1,294 |
Beginning balance |  | 22,458 |  | 22,458 |
Net income (loss) attributable to Johnson Controls | 515 |  | 438 | 870 | 668
Foreign currency translation adjustments | 114 |  | 168 |  |
Foreign currency translation adjustments | 117 |  | 204 | (1) | 283
Realized and unrealized gains (losses) on derivatives | 17 |  | (10) | 19 | (11)
Realized and unrealized losses on marketable securities | 0 |  | (2) | 0 | (2)
Other comprehensive income | 134 |  | 192 | 18 | 270
Comprehensive income attributable to Johnson Controls | 643 |  | 598 | 872 | 887
Comprehensive income attributable to noncontrolling interests | 49 |  | 77 | 103 | 137
Total comprehensive income | 692 |  | 675 | 975 | 1,024
Cash dividends - ordinary shares | (235) |  | (240) | (475) | (482)
Repurchase of ordinary shares | (533) |  | (49) | (1,000) | (199)
Other, including options exercised | 59 |  | 30 | 66 | 42
Ending balance | 20,036 | 20,102 | 20,874 | 20,036 | 20,874
Ending balance | 1,265 |  |  | 1,265 |
Ending balance | 21,301 |  |  | 21,301 |
Equity Attributable to Johnson Controls |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning balance | 20,102 | 21,164 | 20,535 | 21,164 | 20,447
Net income (loss) attributable to Johnson Controls | 515 |  | 438 | 870 | 668
Foreign currency translation adjustments | 114 |  | 168 |  | 226
Foreign currency translation adjustments |  |  |  | (13) |
Realized and unrealized gains (losses) on derivatives | 14 |  | (6) | 15 | (5)
Realized and unrealized losses on marketable securities | 0 |  | (2) | 0 | (2)
Other comprehensive income (loss) | 128 |  | 160 | 2 | 219
Comprehensive income attributable to Johnson Controls | 643 |  | 598 | 872 | 887
Cash dividends - ordinary shares | (235) |  | (240) | (475) | (482)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders | 0 |  | 0 | 0 | 0
Repurchase of ordinary shares | (533) |  | (49) | (1,000) | (199)
Change In noncontrolling interest share | 0 |  | 0 | 0 | 0
Other, including options exercised | 59 |  | 30 | 66 | 42
Ending balance | 20,036 | 20,102 | 20,874 | 20,036 | 20,874
Equity Attributable to Noncontrolling Interest |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning balance | 1,305 | 1,294 | 965 | 1,294 | 920
Income attributable to noncontrolling interests | 43 |  | 33 | 87 | 61
Foreign currency translation adjustments | 3 |  | 31 | 12 | 47
Realized and unrealized gains on derivatives | 3 |  | 1 | 4 | 2
Realized and unrealized gains on marketable securities | 0 |  | 0 | 0 | 0
Other comprehensive income (loss) | 6 |  | 32 | 16 | 49
Comprehensive income attributable to noncontrolling interests | 49 |  | 65 | 103 | 110
Cash dividends - ordinary shares | 0 |  | 0 | 0 | 0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders | (89) |  | (43) | (132) | (43)
Repurchase of ordinary shares | 0 |  | 0 | 0 | 0
Change In noncontrolling interest share | 0 |  | 19 | 0 | 19
Other, including options exercised | 0 |  | 0 | 0 | 0
Ending balance | 1,265 | 1,305 | 1,006 | 1,265 | 1,006
Total Equity Excluding Redeemable Noncontrolling Interest [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning balance | 21,407 | 22,458 | 21,500 | 22,458 | 21,367
Net income | 558 |  | 471 | 957 | 729
Foreign currency translation adjustments | 117 |  | 199 | (1) | 273
Realized and unrealized gains (losses) on derivatives | 17 |  | (5) | 19 | (3)
Realized and unrealized losses on marketable securities | 0 |  | (2) | 0 | (2)
Other comprehensive income | 134 |  | 192 | 18 | 268
Total comprehensive income | 692 |  | 663 | 975 | 997
Cash dividends - ordinary shares | (235) |  | (240) | (475) | (482)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders | (89) |  | (43) | (132) | (43)
Repurchase of ordinary shares | (533) |  | (49) | (1,000) | (199)
Change In noncontrolling interest share | 0 |  | 19 | 0 | 19
Other, including options exercised | 59 |  | 30 | (66) | (42)
Ending balance | $ 21,301 | 21,407 | $ 21,880 | 21,301 | 21,880
Accounting Standards Update 2016-09 [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax |  |  |  |  | 179
Accounting Standards Update 2016-09 [Member] | Equity Attributable to Johnson Controls |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax |  |  |  | 0 | 179
Accounting Standards Update 2016-09 [Member] | Equity Attributable to Noncontrolling Interest |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax |  |  |  | 0 | 0
Accounting Standards Update 2016-09 [Member] | Total Equity Excluding Redeemable Noncontrolling Interest [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax |  |  |  | 0 | 179
Accounting Standards Update 2016-16 [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax |  |  |  | (546) |
Accounting Standards Update 2016-16 [Member] | Equity Attributable to Johnson Controls |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax |  | (546) |  | (546) | 0
Accounting Standards Update 2016-16 [Member] | Equity Attributable to Noncontrolling Interest |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax |  |  |  | 0 | 0
Accounting Standards Update 2016-16 [Member] | Total Equity Excluding Redeemable Noncontrolling Interest [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax |  |  |  | (546) | 0
Accounting Standards Update 2014-09 [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax |  |  |  | (45) |
Accounting Standards Update 2014-09 [Member] | Equity Attributable to Johnson Controls |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax |  | $ (45) |  | (45) | 0
Accounting Standards Update 2014-09 [Member] | Equity Attributable to Noncontrolling Interest |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax |  |  |  | 0 | 0
Accounting Standards Update 2014-09 [Member] | Total Equity Excluding Redeemable Noncontrolling Interest [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax |  |  |  | $ (45) | $ 0

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