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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)