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Note 10. Significant Restructuring and Impairment Costs (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) Employees | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Reserve | $ (205,000,000) | $ (236,000,000) |  |
Seating Restructuring |  |  | $ 315,000,000 |
Interiors Restructuring |  |  | 17,000,000 |
Other Restructuring Costs |  |  | 22,000,000 |
Restructuring and Related Cost, Number of Positions Eliminated, Inception to Date | Employees | 4,000 |  |  |
Restructuring and Related Cost, Number of Positions Eliminated | Employees | 2,000 |  |  |
Number of Plants Closed Since Inception | 18 |  |  |
Number of Plants Closed | $ 10 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Restructuring Liabilities | 11,000,000 |  |  |
2017 Plan [Domain] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Costs and Asset Impairment Charges |  | 46,000,000 | 46,000,000 |
Payments for Restructuring | 4,000,000 | 8,000,000 |  |
Restructuring Reserve | (34,000,000) | (38,000,000) |  |
2018 Plan [Domain] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Costs and Asset Impairment Charges | 13,000,000 |  |  |
Restructuring Reserve | (13,000,000) |  |  |
2016 Plan [Domain] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Costs and Asset Impairment Charges |  |  | 332,000,000 | $ 332,000,000
Payments for Restructuring | 12,000,000 | 60,000,000 | 30,000,000 |
Restructuring Reserve | (135,000,000) | (160,000,000) | (213,000,000) |
Restructuring Reserve, Accrual Adjustment | 13,000,000 |  |  |
RestructuringReserveNonCashChargesandOther |  | (7,000,000) | (89,000,000) |
Employee Severance [Member] | 2017 Plan [Domain] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Costs and Asset Impairment Charges |  |  | 42,000,000 |
Payments for Restructuring | 4,000,000 | 4,000,000 |  |
Restructuring Reserve | (34,000,000) | (38,000,000) |  |
Employee Severance [Member] | 2018 Plan [Domain] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Costs and Asset Impairment Charges | 13,000,000 |  |  |
Restructuring Reserve | (13,000,000) |  |  |
Employee Severance [Member] | 2016 Plan [Domain] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Costs and Asset Impairment Charges |  |  |  | 223,000,000
Payments for Restructuring | 12,000,000 | 48,000,000 | 29,000,000 |
Restructuring Reserve | (121,000,000) | (146,000,000) | (194,000,000) |
Restructuring Reserve, Accrual Adjustment | 13,000,000 |  |  |
RestructuringReserveNonCashChargesandOther |  | 0 | 0 |
Indefinite-lived Intangible Assets [Member] | 2017 Plan [Domain] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Costs and Asset Impairment Charges |  |  | 0 |
Payments for Restructuring | 0 | 0 |  |
Restructuring Reserve | 0 | 0 |  |
Indefinite-lived Intangible Assets [Member] | 2018 Plan [Domain] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Costs and Asset Impairment Charges | 0 |  |  |
Restructuring Reserve | 0 |  |  |
Indefinite-lived Intangible Assets [Member] | 2016 Plan [Domain] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Costs and Asset Impairment Charges |  |  |  | 87,000,000
Payments for Restructuring | 0 | 0 | 0 |
Restructuring Reserve | 0 | 0 | 0 |
Restructuring Reserve, Accrual Adjustment | 0 |  |  |
RestructuringReserveNonCashChargesandOther |  | 0 | (87,000,000) |
Other Restructuring [Member] | 2017 Plan [Domain] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Costs and Asset Impairment Charges |  |  | 4,000,000 |
Payments for Restructuring | 0 | 4,000,000 |  |
Restructuring Reserve | 0 | 0 |  |
Other Restructuring [Member] | 2018 Plan [Domain] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Costs and Asset Impairment Charges | 0 |  |  |
Restructuring Reserve | 0 |  |  |
Other Restructuring [Member] | 2016 Plan [Domain] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Costs and Asset Impairment Charges |  |  |  | 22,000,000
Payments for Restructuring | 0 | 12,000,000 | 1,000,000 |
Restructuring Reserve | (9,000,000) | (9,000,000) | (21,000,000) |
Restructuring Reserve, Accrual Adjustment | 0 |  |  |
RestructuringReserveNonCashChargesandOther |  | 0 | 0 |
Foreign Currency Gain (Loss) [Member] | 2017 Plan [Domain] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Costs and Asset Impairment Charges |  |  | 0 |
Payments for Restructuring | 0 | 0 |  |
Restructuring Reserve | 0 | 0 |  |
Foreign Currency Gain (Loss) [Member] | 2018 Plan [Domain] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Costs and Asset Impairment Charges | 0 |  |  |
Restructuring Reserve | 0 |  |  |
Foreign Currency Gain (Loss) [Member] | 2016 Plan [Domain] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Costs and Asset Impairment Charges |  |  |  | $ 0
Payments for Restructuring | 0 | 0 | 0 |
Restructuring Reserve | (5,000,000) | (5,000,000) | (2,000,000) |
Restructuring Reserve, Accrual Adjustment | $ 0 |  |  |
RestructuringReserveNonCashChargesandOther |  | $ (7,000,000) | $ (2,000,000) |

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