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Equity and Noncontrolling Interests (Tables) | 3 Months Ended
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Dec. 31, 2020
Stockholders' Equity Note [Abstract] |
Equity Attributable to Johnson Controls and Noncontrolling Interests | The following schedules present changes in consolidated equity attributable to Johnson Controls and noncontrolling interests (in millions, net of tax):
| Three Months Ended December 31, 2020 |  | Three Months Ended December 31, 2019
| Equity Attributable to Johnson Controls International plc |  | Equity Attributable to Noncontrolling Interests |  | Total Equity |  | Equity Attributable to Johnson Controls International plc |  | Equity Attributable to Noncontrolling Interests |  | Total Equity
Beginning balance, September 30 | $ | 17,447 |  |  | $ | 1,086 |  |  | $ | 18,533 |  |  | $ | 19,766 |  |  | $ | 1,063 |  |  | $ | 20,829 |
Total comprehensive income: |  |  |  |  |  |  |  |  |  |  |
Net income | 451 |  |  | 45 |  |  | 496 |  |  | 159 |  |  | 32 |  |  | 191 |
Foreign currency translation adjustments | 272 |  |  | 36 |  |  | 308 |  |  | 251 |  |  | 10 |  |  | 261 |
Realized and unrealized gains on derivatives | 1 |  |  | — |  |  | 1 |  |  | 5 |  |  | 2 |  |  | 7 |
Pension and postretirement plans | (1) |  |  | — |  |  | (1) |  |  | (1) |  |  | — |  |  | (1) |
Other comprehensive income | 272 |  |  | 36 |  |  | 308 |  |  | 255 |  |  | 12 |  |  | 267 |
Comprehensive income | 723 |  |  | 81 |  |  | 804 |  |  | 414 |  |  | 44 |  |  | 458 |
Other changes in equity: |  |  |  |  |  |  |  |  |  |  |
Cash dividends—ordinary shares | (189) |  |  | — |  |  | (189) |  |  | (201) |  |  | — |  |  | (201) |
Dividends attributable to noncontrolling interests | — |  |  | — |  |  | — |  |  | — |  |  | (5) |  |  | (5) |
Repurchases and retirements of ordinary shares | (346) |  |  | — |  |  | (346) |  |  | (651) |  |  | — |  |  | (651) |
Adoption of ASC 842 | — |  |  | — |  |  | — |  |  | (5) |  |  | — |  |  | (5) |
Adoption of ASU 2016-13 | (4) |  |  | — |  |  | (4) |  |  | — |  |  | — |  |  | — |
Other, including options exercised | 25 |  |  | — |  |  | 25 |  |  | 6 |  |  | — |  |  | 6 |
Ending balance, December 31 | $ | 17,656 |  |  | $ | 1,167 |  |  | $ | 18,823 |  |  | $ | 19,329 |  |  | $ | 1,102 |  |  | $ | 20,431 |
Changes in Accumulated Other Comprehensive Income, Net of Tax | The following schedules present changes in accumulated other comprehensive income ("AOCI") attributable to Johnson Controls (in millions, net of tax):
| Three Months Ended December 31,
| 2020 |  | 2019
Foreign currency translation adjustments ("CTA") |  |  |
Balance at beginning of period | $ | (778) |  |  | $ | (785) |
Aggregate adjustment for the period (net of tax effect of $0 and $0) | 272 |  |  | 251 |
Balance at end of period | (506) |  |  | (534) |
Realized and unrealized gains (losses) on derivatives |  |  |
Balance at beginning of period | 2 |  |  | (2) |
Current period changes in fair value (net of tax effect of $2 and $2) | 2 |  |  | 5 |
Reclassification to income (net of tax effect of $0 and $0) * | (1) |  |  | — |
Balance at end of period | 3 |  |  | 3 |
Pension and postretirement plans |  |  |
Balance at beginning of period | — |  |  | (8) |
Reclassification to income (net of tax effect of $0 and $0) | (1) |  |  | (1) |
Balance at end of period | (1) |  |  | (9) |
Accumulated other comprehensive loss, end of period | $ | (504) |  |  | $ | (540) |
* Refer to Note 17, "Derivative Instruments and Hedging Activities," of the notes to consolidated financial statements for disclosure of the line items in the consolidated statements of income affected by reclassifications from AOCI into income related to derivatives.

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