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Income Taxes Other Tax Matters (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended 24 Months Ended
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2020
Other Tax Matters [Line Items]                    
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability       $ 139            
Nondeductible expense related to restructuring and impairment           $ 50 $ (24) $ (4)    
Income tax provision (benefit)           108 (233) 197    
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount $ 30   $ (76)     (70) (284) 31    
Mark-to-market gain (loss)           (274) (618) 24    
Release of tax indemnification reserve   $ (226)         (226)      
Restructuring and impairment costs           783 235 255    
Impact of acquisitions and divestitures           0 0 16    
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          
Discontinued Operation, Gain on Disposal of Discontinued Operation, Net of Tax         $ 84          
Global Products                    
Other Tax Matters [Line Items]                    
Impairment of Long-Lived Assets to be Disposed of $ 15 $ 235         235     $ 250
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    
Transaction and integration costs [Member]                    
Other Tax Matters [Line Items]                    
Transaction and integration costs           135 317 226    
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount           18 35 27    
Pension mark-to-market [Member]                    
Other Tax Matters [Line Items]                    
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount           (65) $ (130) 1    
Restructuring Charges [Member]                    
Other Tax Matters [Line Items]                    
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount           $ 48   36    
Continuing Operations [Member] | 2017 Restructuring Plan [Member]                    
Other Tax Matters [Line Items]                    
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]                    
Restructuring and impairment costs               255    
Continuing Operations [Member] | 2018 Restructuring Plan [Member] | Global Products                    
Other Tax Matters [Line Items]                    
Restructuring and impairment costs               $ 113