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Income Taxes Other Tax Matters (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Other Tax Matters [Line Items]                
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability $ 139     $ 101        
Nondeductible expense related to restructuring and impairment           $ (5) $ (17) $ 28
Income tax provision           518 705 197
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount     $ 53     31 (164) (29)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)           10 420 (393)
Restructuring and impairment costs           263 367 288
Post sale contingent tax indemnification liabilities 255   $ 290   $ 290 255 290 290
Impact of acquisitions and divestitures           145 475 163
Power Solutions                
Other Tax Matters [Line Items]                
Impact of acquisitions and divestitures 129              
Scott Safety business [Member]                
Other Tax Matters [Line Items]                
Gain (loss) on divestiture   $ 114            
Income tax expense from disposal   30            
Impact of acquisitions and divestitures             (490)  
Discontinued Operation, Gain on Disposal of Discontinued Operation, Net of Tax   $ 84            
Business Divestitures, Not Specific                
Other Tax Matters [Line Items]                
Post sale contingent tax indemnification liabilities $ 235         235    
2016 Restructuring Plan [Member]                
Other Tax Matters [Line Items]                
Restructuring and impairment costs               620
Transaction and integration costs [Member]                
Other Tax Matters [Line Items]                
Transaction and integration costs           234 428  
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount           27 69  
2018 Restructuring Plan [Member]                
Other Tax Matters [Line Items]                
Income tax provision           38    
2017 Restructuring Plan [Member]                
Other Tax Matters [Line Items]                
Income tax provision             63  
2016 Restructuring Plan [Member]                
Other Tax Matters [Line Items]                
Income tax provision               76
Adient spin-off [Member]                
Other Tax Matters [Line Items]                
Income tax provision               26
Pension mark-to-market [Member]                
Other Tax Matters [Line Items]                
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount           $ (3) $ 126 $ (119)
Tyco merger [Member]                
Other Tax Matters [Line Items]                
Income tax provision         $ 137