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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, 2020 | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2020 | Mar. 31, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning balance | $ 19,329 | $ 20,102 | $ 21,164 | $ 19,766 | $ 21,164
Beginning balance |  |  |  | 1,063 |
Beginning balance |  |  |  | 20,829 |
Net income (loss) attributable to Johnson Controls | 213 | 515 |  | 372 | 870
Foreign currency translation adjustments | (471) | 114 |  | (220) | (13)
Foreign currency translation adjustments | (494) | 117 |  | (233) | (1)
Realized and unrealized gains (losses) on derivatives | (10) | 17 |  | (3) | 19
Pension and postretirement plans | 0 | 0 |  | (1) | 0
Other comprehensive income (loss) | (504) | 134 |  | (237) | 18
Comprehensive income (loss) attributable to Johnson Controls | (268) | 643 |  | 146 | 872
Comprehensive income attributable to noncontrolling interests | 0 | 49 |  | 44 | 103
Total comprehensive income (loss) | (268) | 692 |  | 190 | 975
Cash dividends - ordinary shares | (194) | (235) |  | (395) | (475)
Stock Repurchased and Retired During Period, Value | (816) |  |  | (1,467) |
Repurchases of ordinary shares |  | (533) |  |  | (1,000)
Other, including options exercised | 33 | 59 |  | 39 | 66
Ending balance | 18,084 | 20,036 | 20,102 | 18,084 | 20,036
Ending balance | 1,004 |  |  | 1,004 |
Ending balance | 19,088 |  |  | 19,088 |
Equity Attributable to Johnson Controls |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning balance | 19,329 | 20,102 | 21,164 | 19,766 | 21,164
Net income (loss) attributable to Johnson Controls | 213 | 515 |  | 372 | 870
Foreign currency translation adjustments | (471) | 114 |  | (220) | (13)
Realized and unrealized gains (losses) on derivatives | (10) | 14 |  | (5) | 15
Pension and postretirement plans |  |  |  | (1) | 0
Other comprehensive income (loss) | (481) | 128 |  | (226) | 2
Comprehensive income (loss) attributable to Johnson Controls | (268) | 643 |  | 146 | 872
Cash dividends - ordinary shares | (194) | (235) |  | (395) | (475)
Dividends attributable to noncontrolling interests | 0 | 0 |  | 0 | 0
Stock Repurchased and Retired During Period, Value | (816) |  |  | (1,467) |
Repurchases of ordinary shares |  | (533) |  |  | (1,000)
Other, including options exercised | 33 | 59 |  | 39 | 66
Ending balance | 18,084 | 20,036 | 20,102 | 18,084 | 20,036
Equity Attributable to Noncontrolling Interest |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning balance | 1,102 | 1,305 | 1,294 | 1,063 | 1,294
Income attributable to noncontrolling interests | 23 | 43 |  | 55 | 87
Foreign currency translation adjustments | (23) | 3 |  | (13) | 12
Realized and unrealized gains on derivatives | 0 | 3 |  | 2 | 4
Pension and postretirement plans |  |  |  | 0 | 0
Other comprehensive income (loss) | (23) | 6 |  | (11) | 16
Comprehensive income attributable to noncontrolling interests | 0 | 49 |  | 44 | 103
Cash dividends - ordinary shares | 0 | 0 |  | 0 | 0
Dividends attributable to noncontrolling interests | (98) | (89) |  | (103) | (132)
Stock Repurchased and Retired During Period, Value | 0 |  |  | 0 |
Repurchases of ordinary shares |  | 0 |  |  | 0
Other, including options exercised | 0 | 0 |  | 0 | 0
Ending balance | 1,004 | 1,265 | 1,305 | 1,004 | 1,265
Total Equity Excluding Redeemable Noncontrolling Interest [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning balance | 20,431 | 21,407 | 22,458 | 20,829 | 22,458
Net income | 236 | 558 |  | 427 | 957
Foreign currency translation adjustments | (494) | 117 |  | (233) | (1)
Realized and unrealized gains (losses) on derivatives | (10) | 17 |  | (3) | 19
Pension and postretirement plans |  |  |  | (1) | 0
Other comprehensive income (loss) | (504) | 134 |  | (237) | 18
Total comprehensive income (loss) | (268) | 692 |  | 190 | 975
Cash dividends - ordinary shares | (194) | (235) |  | (395) | (475)
Dividends attributable to noncontrolling interests | (98) | (89) |  | (103) | (132)
Stock Repurchased and Retired During Period, Value | (816) |  |  | (1,467) |
Repurchases of ordinary shares |  | (533) |  |  | (1,000)
Other, including options exercised | 33 | 59 |  | 39 | 66
Ending balance | $ 19,088 | $ 21,301 | 21,407 | 19,088 | 21,301
Adoption of ASC 606 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Accounting Pronouncement |  |  |  |  | (45)
Adoption of ASC 606 | Equity Attributable to Johnson Controls |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Accounting Pronouncement |  |  | (45) | 0 | (45)
Adoption of ASC 606 | Equity Attributable to Noncontrolling Interest |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Accounting Pronouncement |  |  |  | 0 | 0
Adoption of ASC 606 | Total Equity Excluding Redeemable Noncontrolling Interest [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Accounting Pronouncement |  |  |  | 0 | (45)
Adoption of ASU 2016-16 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Accounting Pronouncement |  |  |  |  | (546)
Adoption of ASU 2016-16 | Equity Attributable to Johnson Controls |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Accounting Pronouncement |  |  | $ (546) | 0 | (546)
Adoption of ASU 2016-16 | Equity Attributable to Noncontrolling Interest |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Accounting Pronouncement |  |  |  | 0 | 0
Adoption of ASU 2016-16 | Total Equity Excluding Redeemable Noncontrolling Interest [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Accounting Pronouncement |  |  |  | 0 | (546)
Adoption of ASC 842 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Accounting Pronouncement |  |  |  | (5) |
Adoption of ASC 842 | Equity Attributable to Johnson Controls |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Accounting Pronouncement |  |  |  | (5) | 0
Adoption of ASC 842 | Equity Attributable to Noncontrolling Interest |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Accounting Pronouncement |  |  |  | 0 | 0
Adoption of ASC 842 | Total Equity Excluding Redeemable Noncontrolling Interest [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Accounting Pronouncement |  |  |  | $ (5) | $ 0

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