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Income Taxes Other Tax Matters (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2019
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   $ 75 $ 101        
Nondeductible expense related to restructuring and impairment             $ (24) $ (4) $ (15)  
Income tax provision (benefit)             (233) 197 322  
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount   $ (76)         (284) 31 (164)  
Mark-to-market gain (loss)             (618) 24 384  
Release of tax indemnification reserve $ (226)           (226)      
Restructuring and impairment costs             235 255 347  
Post sale contingent tax indemnification liabilities     255         255   $ 290
Impact of acquisitions and divestitures             0 16 475  
Power Solutions                    
Other Tax Matters [Line Items]                    
Discontinued Operation, Gain on Disposal of Discontinued Operation, Net of Tax 4,000                  
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    
Global Products                    
Other Tax Matters [Line Items]                    
Impairment of Long-Lived Assets to be Disposed of 235           235      
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount $ (53)                  
2017 Restructuring Plan [Member]                    
Other Tax Matters [Line Items]                    
Restructuring and impairment costs                 367  
2018 Restructuring Plan [Member]                    
Other Tax Matters [Line Items]                    
Restructuring and impairment costs               263    
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             317 226 427  
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount             35 27 69  
Pension mark-to-market [Member]                    
Other Tax Matters [Line Items]                    
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount             $ (130) 1 113  
Continuing Operations [Member] | 2017 Restructuring Plan [Member]                    
Other Tax Matters [Line Items]                    
Income tax provision (benefit)                 58  
Restructuring and impairment costs                 347  
Continuing Operations [Member] | 2017 Restructuring Plan [Member] | Global Products                    
Other Tax Matters [Line Items]                    
Restructuring and impairment costs                 $ 32  
Continuing Operations [Member] | 2018 Restructuring Plan [Member]                    
Other Tax Matters [Line Items]                    
Income tax provision (benefit)               36    
Restructuring and impairment costs               255    
Continuing Operations [Member] | 2018 Restructuring Plan [Member] | Global Products                    
Other Tax Matters [Line Items]                    
Restructuring and impairment costs               $ 113    
Continuing Operations [Member] | 2016 Restructuring Plan [Member]                    
Other Tax Matters [Line Items]                    
Restructuring and impairment costs                   222
Continuing Operations [Member] | 2016 Restructuring Plan [Member] | Global Products                    
Other Tax Matters [Line Items]                    
Restructuring and impairment costs                   $ 44