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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, 2019 | Dec. 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning balance | $ 19,766 | $ 21,164
Beginning balance | 1,063 |
Beginning balance | 20,829 |
Net income (loss) attributable to Johnson Controls | 159 | 355
Foreign currency translation adjustments | 251 | (127)
Foreign currency translation adjustments | 261 | (118)
Realized and unrealized gains on derivatives | 7 | 2
Pension and postretirement plans | (1) | 0
Other comprehensive income (loss) | 267 | (116)
Comprehensive income attributable to Johnson Controls | 414 | 229
Comprehensive income attributable to noncontrolling interests | 44 | 54
Total comprehensive income | 458 | 283
Cash dividends - ordinary shares | (201) | (240)
Stock Repurchased and Retired During Period, Value | (651) |
Repurchases and retirements of ordinary shares |  | (467)
Other, including options exercised | 6 | 7
Ending balance | 19,329 | 20,102
Ending balance | 1,102 |
Ending balance | 20,431 |
Equity Attributable to Johnson Controls |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning balance | 19,766 | 21,164
Net income (loss) attributable to Johnson Controls | 159 | 355
Foreign currency translation adjustments | 251 | (127)
Realized and unrealized gains on derivatives | 5 | 1
Pension and postretirement plans | (1) | 0
Other comprehensive income (loss) | 255 | (126)
Comprehensive income attributable to Johnson Controls | 414 | 229
Cash dividends - ordinary shares | (201) | (240)
Dividends attributable to noncontrolling interests | 0 | 0
Stock Repurchased and Retired During Period, Value | (651) |
Repurchases and retirements of ordinary shares |  | (467)
Other, including options exercised | 6 | 7
Ending balance | 19,329 | 20,102
Equity Attributable to Noncontrolling Interest |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning balance | 1,063 | 1,294
Income attributable to noncontrolling interests | 32 | 44
Foreign currency translation adjustments | 10 | 9
Realized and unrealized gains on derivatives | 2 | 1
Pension and postretirement plans | 0 | 0
Other comprehensive income (loss) | 12 | 10
Comprehensive income attributable to noncontrolling interests | 44 | 54
Cash dividends - ordinary shares | 0 | 0
Dividends attributable to noncontrolling interests | (5) | (43)
Stock Repurchased and Retired During Period, Value | 0 |
Repurchases and retirements of ordinary shares |  | 0
Other, including options exercised | 0 | 0
Ending balance | 1,102 | 1,305
Total Equity Excluding Redeemable Noncontrolling Interest [Member] |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning balance | 20,829 | 22,458
Net income | 191 | 399
Foreign currency translation adjustments | 261 | (118)
Realized and unrealized gains on derivatives | 7 | 2
Pension and postretirement plans | (1) | 0
Other comprehensive income (loss) | 267 | (116)
Total comprehensive income | 458 | 283
Cash dividends - ordinary shares | (201) | (240)
Dividends attributable to noncontrolling interests | (5) | (43)
Stock Repurchased and Retired During Period, Value | (651) |
Repurchases and retirements of ordinary shares |  | (467)
Other, including options exercised | 6 | 7
Ending balance | 20,431 | 21,407
Adoption of ASC 606 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Cumulative Effect on Retained Earnings, Net of Tax |  | (45)
Adoption of ASC 606 | Equity Attributable to Johnson Controls |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Cumulative Effect on Retained Earnings, Net of Tax | 0 | (45)
Adoption of ASC 606 | Equity Attributable to Noncontrolling Interest |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Cumulative Effect on Retained Earnings, Net of Tax | 0 | 0
Adoption of ASC 606 | Total Equity Excluding Redeemable Noncontrolling Interest [Member] |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Cumulative Effect on Retained Earnings, Net of Tax | 0 | (45)
Adoption of ASU 2016-16 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Cumulative Effect on Retained Earnings, Net of Tax |  | (546)
Adoption of ASU 2016-16 | Equity Attributable to Johnson Controls |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Cumulative Effect on Retained Earnings, Net of Tax | 0 | (546)
Adoption of ASU 2016-16 | Equity Attributable to Noncontrolling Interest |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Cumulative Effect on Retained Earnings, Net of Tax | 0 | 0
Adoption of ASU 2016-16 | Total Equity Excluding Redeemable Noncontrolling Interest [Member] |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Cumulative Effect on Retained Earnings, Net of Tax | 0 | (546)
Adoption of ASC 842 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Cumulative Effect on Retained Earnings, Net of Tax | (5) |
Adoption of ASC 842 | Equity Attributable to Johnson Controls |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Cumulative Effect on Retained Earnings, Net of Tax | (5) | 0
Adoption of ASC 842 | Equity Attributable to Noncontrolling Interest |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Cumulative Effect on Retained Earnings, Net of Tax | 0 | 0
Adoption of ASC 842 | Total Equity Excluding Redeemable Noncontrolling Interest [Member] |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Cumulative Effect on Retained Earnings, Net of Tax | $ (5) | $ 0

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