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Note 14. Significant Restructuring and Impairment Costs (Details) | 12 Months Ended
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Sep. 30, 2017 USD ($) Employees | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Costs and Asset Impairment Charges | $ 46,000,000 | $ 332,000,000 | $ 182,000,000 |
Restructuring Reserve | $ 236,000,000 | 351,000,000 |  |
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 | 6,200 |  |  |
Document Period End Date | Sep. 30, 2017 |  |  |
Restructuring and Related Cost, Number of Positions Eliminated | Employees | 3,200 |  |  |
Number of Plants Closed Since Inception | 15 |  |  |
Number of Plants Closed | $ 9 |  |  |
2017 Plan [Domain] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Costs and Asset Impairment Charges | 46,000,000 |  |  |
Restructuring Reserve | 38,000,000 | 46,000,000 |  |
Restructuring Charges | (8,000,000) |  |  |
RestructuringReserveNonCashChargesandOther | 0 |  |  |
2016 Plan [Domain] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Reserve | 160,000,000 | 213,000,000 | 332,000,000 |
Restructuring Charges | (60,000,000) | (30,000,000) |  |
RestructuringReserveNonCashChargesandOther | 7,000,000 | 89,000,000 |  |
2015 Plan [Domain] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Reserve | 16,000,000 | 112,000,000 | 154,000,000 | $ 182,000,000
Restructuring Charges | (94,000,000) | (41,000,000) |  | (1,000,000)
RestructuringReserveNonCashChargesandOther | 2,000,000 | 1,000,000 |  | 27,000,000
Employee Severance [Member] | 2017 Plan [Domain] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Reserve | 38,000,000 | 42,000,000 |  |
Restructuring Charges | (4,000,000) |  |  |
RestructuringReserveNonCashChargesandOther | 0 |  |  |
Employee Severance [Member] | 2016 Plan [Domain] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Reserve | 146,000,000 | 194,000,000 | 223,000,000 |
Restructuring Charges | (48,000,000) | (29,000,000) |  |
RestructuringReserveNonCashChargesandOther | 0 | 0 |  |
Employee Severance [Member] | 2015 Plan [Domain] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Reserve | 19,000,000 | 113,000,000 | 154,000,000 | 155,000,000
Restructuring Charges | (94,000,000) | (41,000,000) |  | (1,000,000)
RestructuringReserveNonCashChargesandOther | 0 | 0 |  | 0
Indefinite-lived Intangible Assets [Member] | 2017 Plan [Domain] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Reserve | 0 | 0 |  |
Restructuring Charges | 0 |  |  |
RestructuringReserveNonCashChargesandOther | 0 |  |  |
Indefinite-lived Intangible Assets [Member] | 2016 Plan [Domain] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Reserve | 0 | 0 | 87,000,000 |
Restructuring Charges | 0 | 0 |  |
RestructuringReserveNonCashChargesandOther | 0 | 87,000,000 |  |
Indefinite-lived Intangible Assets [Member] | 2015 Plan [Domain] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Reserve | 0 | 0 | 0 | 27,000,000
Restructuring Charges | 0 | 0 |  | 0
RestructuringReserveNonCashChargesandOther | 0 | 0 |  | 27,000,000
Other Restructuring [Member] | 2017 Plan [Domain] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Reserve | 0 | 4,000,000 |  |
Restructuring Charges | (4,000,000) |  |  |
RestructuringReserveNonCashChargesandOther | 0 |  |  |
Other Restructuring [Member] | 2016 Plan [Domain] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Reserve | 9,000,000 | 21,000,000 | 22,000,000 |
Restructuring Charges | (12,000,000) | (1,000,000) |  |
RestructuringReserveNonCashChargesandOther | 0 | 0 |  |
Foreign Currency Gain (Loss) [Member] | 2017 Plan [Domain] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Reserve | 0 | 0 |  |
Restructuring Charges | 0 |  |  |
RestructuringReserveNonCashChargesandOther | 0 |  |  |
Foreign Currency Gain (Loss) [Member] | 2016 Plan [Domain] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Reserve | 5,000,000 | 2,000,000 | 0 |
Restructuring Charges | 0 | 0 |  |
RestructuringReserveNonCashChargesandOther | 7,000,000 | 2,000,000 |  |
Foreign Currency Gain (Loss) [Member] | 2015 Plan [Domain] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Reserve | 3,000,000 | 1,000,000 | $ 0 | 0
Restructuring Charges | 0 | 0 |  | 0
RestructuringReserveNonCashChargesandOther | $ 2,000,000 | $ 1,000,000 |  | $ 0

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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