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Income Taxes Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2015
Dec. 31, 2016
Deferred income tax assets and liabilities [Line Items]    
Postretirement Benefits Other Than Pensions $ 2,712 $ 2,720
Pension and Other Employee Benefit Plans 6,502 5,701
Warranties, Dealer and Customer Allowances, Claims and Discounts 6,725 8,102
Property, Plants and Equipment 1,981 756
Miscellaneous 2,086 1,950
Total Deferred Tax Assets before Valuation Allowances 41,868 39,964
Valuation Allowances (5,021) (4,644)
Total Deferred Tax Assets 36,847 35,320
Intangible Assets 590 732
Net Deferred Tax Assets 36,257 34,588
GME [Member]    
Deferred income tax assets and liabilities [Line Items]    
Income Tax Expense (Benefit) from Change in Valuation Allowance 3,900  
U.S.    
Deferred income tax assets and liabilities [Line Items]    
Capitalized Research Expenditures 7,413 6,127
Operating Loss and Tax Credit Carryforwards 8,623 8,987
Operating Loss and Tax Credit Carryforwards, Subject to Expiration   8,700
Operating Loss and Tax Credit Carryforwards, Not Subject to Expiration   300
Non-U.S.    
Deferred income tax assets and liabilities [Line Items]    
Operating Loss and Tax Credit Carryforwards $ 5,826 5,621
Operating Loss and Tax Credit Carryforwards, Subject to Expiration   1,300
Operating Loss and Tax Credit Carryforwards, Not Subject to Expiration   4,300
GME, South Korea, and certain U.S. states [Member]    
Deferred income tax assets and liabilities [Line Items]    
Valuation Allowances   $ (4,600)