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Equity and Noncontrolling Interests - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2017
Realized and unrealized gains (losses) on derivatives |  |  |  |
Current period changes in fair value |  | $ (1) | $ 4 |
Pension and postretirement plans |  |  |  |
Accumulated other comprehensive loss |  | (414) | (1,233) | $ (473)
Foreign Currency Translation Adjustments |  |  |  |
Foreign currency translation adjustments |  |  |  |
Balance at beginning of period |  | (481) | (1,152) |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent |  | 58 | (659) |
Adient spin-off impact |  | 0 | 563 |
Balance at end of period |  | (423) | (1,248) |
Aggregate adjustment for period, tax effect | [1] | 1 | 5 |
Adient spin-off impact, tax effect |  | 0 | 0 |
Realized and Unrealized Gains (Losses) on Derivatives |  |  |  |
Realized and unrealized gains (losses) on derivatives |  |  |  |
Balance at beginning of period |  | 6 | 4 |
Current period changes in fair value |  | 6 | 6 |
Reclassification to income |  | (5) | (6) |
Adient spin-off impact |  | 0 | 16 |
Balance at end of period |  | 7 | 20 |
Current period changes in fair value, tax effect |  | 3 | 4 |
Reclassifcation to income, tax effect | [2] | (2) | (3) |
Adient spin-off, tax effect |  | 0 | 6 |
Realized and unrealized gains (losses) on marketable securities |  |  |  |
Realized and unrealized gains (losses) on marketable securities |  |  |  |
Balance at beginning of period |  | 4 | (1) |
Current period changes in fair value |  | 0 | (2) |
Balance at end of period |  | 4 | (3) |
Current period changes in fair value, tax effect |  | 0 | 0 |
Pension And Postretirement Plans |  |  |  |
Pension and postretirement plans |  |  |  |
Balance at beginning of period |  | (2) | (4) |
Adient spin-off impact |  | 0 | 2 |
Balance at end of period |  | (2) | (2) |
Adient spin-off, tax effect |  | 0 | $ 0 |
Scott Safety business [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax |  | $ 12 |  |
[1] | * During the three months ended December 31, 2017, $12 million of cumulative CTA were recognized as part of the divestiture-related gain recognized as a result of the divestiture of Scott Safety.
[2] | * Refer to Note 15, "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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Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=jci_ScottSafetybusinessMember
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Data Type: | na
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