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Note 14. Significant Restructuring and Impairment Costs (Details)
 12 Months Ended
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