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Note 13. Retirement Plans (Tables) | 12 Months Ended
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Sep. 30, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Schedule of Allocation of Plan Assets [Table Text Block] | Adient's plan assets by asset category, are as follows:
|  | Fair Value Measurements Using:
(in millions) |  | Total as of September 30, 2017 |  | Quoted Prices in Active Markets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Net Asset Value (NAV)
Pension |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 10 |  |  | $ | 10 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Equity Securities |  |  |  |  |  |  |  |  |  |
Domestic |  | 23 |  |  | 4 |  |  | — |  |  | — |  |  | 19 |
International - Developed |  | 74 |  |  | 52 |  |  | — |  |  | — |  |  | 22 |
International - Emerging |  | 10 |  |  | 6 |  |  | — |  |  | — |  |  | 4 |
Fixed Income Securities |  |  |  |  |  |  |  |  |  |
Government |  | 195 |  |  | 76 |  |  | 87 |  |  | — |  |  | 32 |
Corporate/Other |  | 80 |  |  | 52 |  |  | 13 |  |  | — |  |  | 15 |
Hedge Fund |  | 73 |  |  | — |  |  | 73 |  |  | — |  |  | — |
Real Estate |  | 26 |  |  | — |  |  | — |  |  | 11 |  |  | 15 |
Total |  | $ | 491 |  |  | $ | 200 |  |  | $ | 173 |  |  | $ | 11 |  |  | $ | 107 |
Postretirement: |  |  |  |  |  |  |  |  |  |
Equity Securities |  |  |  |  |  |  |  |  |  |
Domestic |  | $ | 4 |  |  | $ | 4 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
International - Developed |  | 5 |  |  | 5 |  |  | — |  |  | — |  |  | — |
Fixed Income Securities |  |  |  |  |  |  |  |  |  |
Government |  | 3 |  |  | 3 |  |  | — |  |  | — |  |  | — |
Corporate/Other |  | 3 |  |  | 3 |  |  | — |  |  | — |  |  | — |
Total |  | $ | 15 |  |  | $ | 15 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
|  | Fair Value Measurements Using:
(in millions) |  | Total as of September 30, 2016 |  | Quoted Prices in Active Markets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Net Asset Value (NAV)
Pension |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 13 |  |  | $ | 13 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Equity Securities |  |  |  |  |  |  |  |  |  |
Domestic |  | 39 |  |  | 20 |  |  | — |  |  | — |  |  | 19 |
International - Developed |  | 45 |  |  | 26 |  |  | — |  |  | — |  |  | 19 |
International - Emerging |  | 7 |  |  | 3 |  |  | — |  |  | — |  |  | 4 |
Fixed Income Securities |  |  |  |  |  |  |  |  |  |
Government |  | 172 |  |  | 98 |  |  | 51 |  |  | — |  |  | 23 |
Corporate/Other |  | 90 |  |  | 70 |  |  | 5 |  |  | — |  |  | 15 |
Hedge Fund |  | 65 |  |  | — |  |  | 65 |  |  | — |  |  | — |
Real Estate |  | 26 |  |  | — |  |  | — |  |  | 9 |  |  | 17 |
Total |  | $ | 457 |  |  | $ | 230 |  |  | $ | 121 |  |  | $ | 9 |  |  | $ | 97 |
Postretirement: |  |  |  |  |  |  |  |  |  |
Equity Securities |  |  |  |  |  |  |  |  |  |
Domestic |  | $ | 3 |  |  | $ | 3 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
International - Developed |  | 1 |  |  | 1 |  |  | — |  |  | — |  |  | — |
International - Emerging |  | 1 |  |  | 1 |  |  | — |  |  | — |  |  | — |
Fixed Income Securities |  |  |  |  |  |  |  |  |  |
Government |  | 1 |  |  | 1 |  |  | — |  |  | — |  |  | — |
Corporate/Other |  | 4 |  |  | 4 |  |  | — |  |  | — |  |  | — |
Commodities |  | 1 |  |  | 1 |  |  | — |  |  | — |  |  | — |
Real Estate |  | 1 |  |  | 1 |  |  | — |  |  | — |  |  | — |
Total |  | $ | 12 |  |  | $ | 12 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block] | The following sets forth a summary of changes in the fair value of pension assets measured using significant unobservable inputs (Level 3):
(in millions) |  | Real Estate
Pension |  |
Asset value as of September 30, 2015 |  | $ | 8 |
Unrealized gain |  | 1 |
Asset value as of September 30, 2016 |  | $ | 9 |
Redemptions |  | (1 | )
Unrealized gain |  | 3 |
Asset value as of September 30, 2017 |  | $ | 11 |
Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block] | The table that follows contains the ABO and reconciliations of the changes in the PBO, the changes in plan assets and the funded status:
|  | Pension Benefits |  | Postretirement Benefits
(in millions) |  | 2017 |  | 2016 |  | 2017 |  | 2016
Accumulated Benefit Obligation |  | $ | 577 |  |  | $ | 613 |  |  | $ | — |  |  | $ | — |
Change in Projected Benefit Obligation: |  |  |  |  |  |  |  |
Projected benefit obligation at beginning of year |  | $ | 637 |  |  | $ | 527 |  |  | $ | 16 |  |  | $ | 15 |
Service cost |  | 8 |  |  | 8 |  |  | — |  |  | — |
Interest cost |  | 12 |  |  | 16 |  |  | 1 |  |  | — |
Plan participant contributions |  | — |  |  | — |  |  | 1 |  |  | 1 |
Actuarial (gain) loss |  | (51 | ) |  | 132 |  |  | — |  |  | 2 |
Benefits and settlements paid |  | (29 | ) |  | (30 | ) |  | (1 | ) |  | (2 | )
Other |  | — |  |  | 14 |  |  | (1 | ) |  | — |
Currency translation adjustment |  | 23 |  |  | (30 | ) |  | — |  |  | — |
Projected benefit obligation at end of year |  | $ | 600 |  |  | $ | 637 |  |  | $ | 16 |  |  | $ | 16 |
Change in Plan Assets: |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year |  | $ | 457 |  |  | $ | 421 |  |  | $ | 12 |  |  | $ | 13 |
Actual return on plan assets |  | 9 |  |  | 44 |  |  | 2 |  |  | 1 |
Employer and employee contributions |  | 37 |  |  | 35 |  |  | 2 |  |  | 1 |
Benefits and settlements paid |  | (29 | ) |  | (30 | ) |  | (1 | ) |  | (2 | )
Other |  | — |  |  | 16 |  |  | — |  |  | (1 | )
Currency translation adjustment |  | 17 |  |  | (29 | ) |  | — |  |  | — |
Fair value of plan assets at end of year |  | $ | 491 |  |  | $ | 457 |  |  | $ | 15 |  |  | $ | 12 |
Funded status |  | $ | (109 | ) |  | $ | (180 | ) |  | $ | (1 | ) |  | $ | (4 | )
Amounts recognized in the statement of financial position consist of: |  |  |  |  |  |  |  |
Prepaid benefit cost |  | $ | 22 |  |  | $ | 8 |  |  | $ | — |  |  | $ | — |
Accrued benefit liability |  | (131 | ) |  | (188 | ) |  | (1 | ) |  | (4 | )
Net amount recognized |  | $ | (109 | ) |  | $ | (180 | ) |  | $ | (1 | ) |  | $ | (4 | )
|  | Pension Benefits |  | Postretirement Benefits
|  | U.S. Plans |  | Non-U.S. Plans |
|  | 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016
Weighted Average Assumptions (1): |  |  |  |  |  |  |  |  |  |  |  |
Discount rate (2) |  | 3.85 | % |  | 3.70 | % |  | 2.60 | % |  | 2.10 | % |  | 3.50 | % |  | 3.25 | %
Rate of compensation increase |  | NA |  |  | NA |  |  | 3.55 | % |  | 4.00 | % |  | NA |  |  | NA |
Schedule of Net Benefit Costs [Table Text Block] | The tables that follow contain the components and key assumptions of net periodic benefit cost:
|  | Pension Benefits |  | Postretirement Benefits
(in millions) |  | 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015
Components of Net Periodic Benefit Cost (Credit): |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 8 |  |  | $ | 8 |  |  | $ | 10 |  |  | $ | — |  |  | $ | — |  |  | $ | 1 |
Interest cost |  | 12 |  |  | 16 |  |  | 19 |  |  | 1 |  |  | — |  |  | 1 |
Expected return on plan assets |  | (17 | ) |  | (22 | ) |  | (21 | ) |  | — |  |  | — |  |  | (1 | )
Net actuarial (gain) loss |  | (43 | ) |  | 109 |  |  | 6 |  |  | (2 | ) |  | 1 |  |  | — |
Settlement loss |  | — |  |  | 1 |  |  | — |  |  | — |  |  | — |  |  | — |
Net periodic benefit cost (credit) |  | $ | (40 | ) |  | $ | 112 |  |  | $ | 14 |  |  | $ | (1 | ) |  | $ | 1 |  |  | $ | 1 |
|  | Pension Benefits |  | Postretirement Benefits
|  | U.S. Plans |  | Non-U.S. Plans |
|  | 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015
Expense Assumptions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  | 3.70 | % |  | 4.40 | % |  | 4.35 | % |  | 2.10 | % |  | 3.40 | % |  | 3.50 | % |  | 3.25 | % |  | 3.80 | % |  | 4.35 | %
Expected return on plan assets |  | 5.50 | % |  | 7.50 | % |  | 7.50 | % |  | 3.80 | % |  | 4.45 | % |  | 5.40 | % |  | 3.35 | % |  | 3.80 | % |  | 4.00 | %
Rate of compensation increase |  | NA |  |  | NA |  |  | NA |  |  | 4.00 | % |  | 3.00 | % |  | 3.00 | % |  | NA |  |  | NA |  |  | NA |
Pension Plan [Member] |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Schedule of Expected Benefit Payments [Table Text Block] | In fiscal 2017, total Adient contributions to the defined benefit pension plans were $37 million, of which $2 million were voluntary contributions. Contributions of at least $13 million in cash to its defined benefit pension plans are expected in fiscal 2018. Projected benefit payments from the plans as of September 30, 2017 are estimated as follows (in millions):
2018 | $ | 26 |
2019 | 27 |
2020 | 28 |
2021 | 27 |
2022 | 33 |
2023-2027 | 176 |
Other Postretirement Benefit Plan [Member] |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Schedule of Expected Benefit Payments [Table Text Block] | In fiscal 2017, total employer and employee contributions to the postretirement plans were $2 million. Adient does not expect to make any significant contributions to its postretirement plans in fiscal year 2018. Projected benefit payments from the plans as of September 30, 2017 are estimated as follows (in millions):
2018 | $ | 1 |
2019 | 1 |
2020 | 1 |
2021 | 1 |
2022 | 1 |
2023-2027 | 7 |

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