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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, 2018 | Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning balance | $ 21,164 | $ 20,447
Beginning balance | 1,294 |
Beginning balance | 22,458 |
Foreign currency translation adjustments | (118) | 79
Realized and unrealized gains (losses) on derivatives | 2 | (1)
Other comprehensive income (loss) | (116) | 78
Comprehensive income attributable to Johnson Controls | 229 | 289
Comprehensive income attributable to noncontrolling interests | 54 | 60
Total comprehensive income | 283 | 349
Cash dividends - ordinary shares | (240) | (242)
Repurchase of ordinary shares | (467) | (150)
Other, including options exercised | 7 | 12
Ending balance | 20,102 | 20,535
Ending balance | 1,305 |
Ending balance | 21,407 |
Net income (loss) attributable to Johnson Controls | 355 | 230
Equity Attributable to Johnson Controls |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning balance | 21,164 | 20,447
Foreign currency translation adjustments | (127) | 58
Realized and unrealized gains (losses) on derivatives | 1 | 1
Other comprehensive income (loss) | (126) | 59
Comprehensive income attributable to Johnson Controls | 229 | 289
Cash dividends - ordinary shares | (240) | (242)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders | 0 | 0
Repurchase of ordinary shares | (467) | (150)
Other, including options exercised | 7 | 12
Ending balance | 20,102 | 20,535
Net income (loss) attributable to Johnson Controls | 355 | 230
Equity Attributable to Noncontrolling Interest |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning balance | 1,294 | 920
Income attributable to noncontrolling interests | 44 | 28
Foreign currency translation adjustments | 9 | 16
Realized and unrealized gains on derivatives | 1 | 1
Other comprehensive income (loss) | 10 | 17
Comprehensive income attributable to noncontrolling interests | 54 | 45
Cash dividends - ordinary shares | 0 | 0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders | (43) | 0
Repurchase of ordinary shares | 0 | 0
Other, including options exercised | 0 | 0
Ending balance | 1,305 | 965
Total Equity Excluding Redeemable Noncontrolling Interest [Member] |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning balance | 22,458 | 21,367
Net income | 399 | 258
Foreign currency translation adjustments | (118) | 74
Realized and unrealized gains (losses) on derivatives | 2 | 2
Other comprehensive income (loss) | (116) | 76
Total comprehensive income | 283 | 334
Cash dividends - ordinary shares | (240) | (242)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders | (43) | 0
Repurchase of ordinary shares | (467) | (150)
Other, including options exercised | 7 | 12
Ending balance | 21,407 | 21,500
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) | 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) | 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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