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Equity and Noncontrolling Interests Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Accumulated other comprehensive loss, end of period |  | $ (473) | $ (1,153) | $ (1,057)
Realized and unrealized gains (losses) on derivatives |  |  |  |
Current period changes in fair value |  | (14) | 9 | (10)
Foreign Currency Translation |  |  |  |
Foreign currency translation adjustments |  |  |  |
Balance at beginning of period |  | (1,152) | (1,047) | (248)
Aggregate adjustment for the period | [1] | 108 | (105) | (799)
Balance at end of period |  | (481) | (1,152) | (1,047)
Aggregate adjustment for the period, tax |  | 1 | (43) | (44)
Pension and postretirement plans |  |  |  |
Other Comprehensive Income, Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Adient spin-off |  | 563 | 0 | 0
Realized And Unrealized Gains Losses On Derivatives |  |  |  |
Realized and unrealized gains (losses) on derivatives |  |  |  |
Balance at beginning of period |  | 4 | (7) | 4
Current period changes in fair value |  | 9 | (10) | (17)
Reclassification to income | [2] | (23) | 21 | 6
Adient spin-off impact |  | 16 | 0 | 0
Balance at end of period |  | 6 | 4 | (7)
Current period changes in fair value, tax |  | 4 | (5) | (7)
Reclassification to income, tax |  | (10) | 11 | 3
Other Comprehensive Income, Unrealized Gain on Derivatives Arising Due to Adient spin-off, Tax |  | 6 |  |
Unrealized Gain Loss On Marketable Common Stock |  |  |  |
Realize and unrealized gains (losses) on marketable common stock |  |  |  |
Balance at beginning of period |  | (1) | 0 | 0
Current period changes in fair value |  | 5 | (1) | 0
Balance at end of period |  | 4 | (1) | 0
Current period changes in fair value, tax |  | 1 | 0 | 0
Pension And Other Postretirement Benefit Plans Assets |  |  |  |
Pension and postretirement plans |  |  |  |
Balance at beginning of period |  | (4) | (3) | 7
Reclassification to income | [3] | 0 | (1) | (11)
Adient spin-off impact |  | 2 | 0 | 0
Other changes |  | 0 | 0 | 1
Balance at end of period |  | (2) | (4) | (3)
Reclassification to income, tax |  | 0 | 0 | (3)
Adient spin-off, tax |  | 0 | $ 0 | 0
Other Comprehensive Income, Pension and Other Postretirement Benefit Plan, Tax, due to Adient spin-off |  | $ 0 |  |
Global Workplace Solutions | Foreign Currency Translation |  |  |  |
Foreign currency translation adjustments |  |  |  |
Aggregate adjustment for the period |  |  |  | $ (19)
[1] | * During fiscal 2015, ($19) million of cumulative CTA were recognized as part of the divestiture-related gain recognized within discontinued operations as a result of the divestiture of GWS.
[2] | Refer to Note 10, "Derivative Instruments and Hedging Activities," of the notes to consolidated financial statements for disclosure of the line items on the consolidated statements of income affected by reclassifications from AOCI into income related to derivatives.
[3] | Refer to Note 15, "Retirement Plans," of the notes to consolidated financial statements for disclosure of the components of the Company's net periodic benefit costs associated with its defined benefit pension and postretirement plans. For the year ended September 30, 2016 the amounts reclassified from AOCI into income for pension and postretirement plans were primarily recorded in selling, general and administrative expenses on the consolidated statements of income. For the year ended September 30, 2015 the amounts reclassified from AOCI into income for pension and postretirement plans were primarily recorded in selling, general and administrative expenses and income (loss) from discontinued operations, net of tax on the consolidated statements of income.

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