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Discontinued Operations Assets and Liabilities Held for Sale Additional Information (Details) - USD ($)
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Assets and Liabilities Held for Sale [Line Items]      
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent $ 0 $ 124,000,000 $ (189,000,000)
Assets held for sale 17,000,000 55,000,000  
Disposal Group, Including Discontinued Operation, Liabilities 0 42,000,000  
Automotive Experience Electronics      
Assets and Liabilities Held for Sale [Line Items]      
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent 0 0 $ (218,000,000)
Corporate      
Assets and Liabilities Held for Sale [Line Items]      
Assets held for sale $ 17,000,000    
Automotive Experience Interiors      
Assets and Liabilities Held for Sale [Line Items]      
Assets held for sale   55,000,000  
Disposal Group, Including Discontinued Operation, Liabilities   $ 42,000,000