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Note 10, Significant Restructuring and Impairment Costs (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 USD ($) Employees | Jun. 30, 2016 USD ($) | Mar. 31, 2015 USD ($) | Jun. 30, 2017 USD ($) Employees | Jun. 30, 2016 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring Reserve | $ (213,000,000) |  |  | $ (213,000,000) |  | $ (351,000,000) |  |
Restructuring Costs and Asset Impairment Charges | $ 0 | $ 75,000,000 | $ 169,000,000 | $ 6,000,000 | $ 244,000,000 | 332,000,000 | $ 182,000,000 |
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 | 5,500 |  |  | 5,500 |  |  |  |
Restructuring and Related Cost, Number of Positions Eliminated | Employees |  |  |  | 2,800 |  |  |  |
Number of Plants Closed Since Inception |  |  |  | 13 |  |  |  |
Number of Plants Closed |  |  |  | $ 8 |  |  |  |
2016 Plan [Domain] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring Reserve | $ (176,000,000) |  |  | (176,000,000) |  | (213,000,000) | (332,000,000) |
Restructuring Charges |  |  |  | (39,000,000) |  | (30,000,000) |  |
RestructuringReserveNonCashChargesandOther |  |  |  | 2,000,000 |  | 89,000,000 |  |
2015 Plan [Domain] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring Reserve | (23,000,000) |  |  | (23,000,000) |  | (112,000,000) | (154,000,000) | $ (182,000,000)
Restructuring Charges |  |  |  | (87,000,000) |  | (41,000,000) |  | (1,000,000)
RestructuringReserveNonCashChargesandOther |  |  |  | 2,000,000 |  | 1,000,000 |  | 27,000,000
Employee Severance [Member] | 2016 Plan [Domain] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring Reserve | (169,000,000) |  |  | (169,000,000) |  | (194,000,000) | (223,000,000) |
Restructuring Charges |  |  |  | (25,000,000) |  | (29,000,000) |  |
RestructuringReserveNonCashChargesandOther |  |  |  | 0 |  | 0 |  |
Employee Severance [Member] | 2015 Plan [Domain] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring Reserve | (26,000,000) |  |  | (26,000,000) |  | (113,000,000) | (154,000,000) | (155,000,000)
Restructuring Charges |  |  |  | (87,000,000) |  | (41,000,000) |  | (1,000,000)
RestructuringReserveNonCashChargesandOther |  |  |  | 0 |  | 0 |  | 0
Indefinite-lived Intangible Assets [Member] | 2016 Plan [Domain] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring Reserve | 0 |  |  | 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 | 0 | (27,000,000)
Restructuring Charges |  |  |  | 0 |  | 0 |  | 0
RestructuringReserveNonCashChargesandOther |  |  |  | 0 |  | 0 |  | 27,000,000
Other Restructuring [Member] | 2016 Plan [Domain] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring Reserve | (7,000,000) |  |  | (7,000,000) |  | (21,000,000) | (22,000,000) |
Restructuring Charges |  |  |  | (14,000,000) |  | (1,000,000) |  |
RestructuringReserveNonCashChargesandOther |  |  |  | 0 |  | 0 |  |
Foreign Currency Gain (Loss) [Member] | 2016 Plan [Domain] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring Reserve | 0 |  |  | 0 |  | (2,000,000) | 0 |
Restructuring Charges |  |  |  | 0 |  | 0 |  |
RestructuringReserveNonCashChargesandOther |  |  |  | 2,000,000 |  | 2,000,000 |  |
Foreign Currency Gain (Loss) [Member] | 2015 Plan [Domain] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring Reserve | $ (3,000,000) |  |  | (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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