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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2019
Jun. 30, 2018
Sep. 30, 2018
Sep. 30, 2016
Income Taxes, Additional Information [Line Items]                
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount $ 199           $ 108  
Income tax provision $ 239   $ 61   $ 394 $ 314 $ (108)  
Expected Rate on Deferred Tax Reversals 21.00%           24.50%  
Effective income tax rate 52.00%   10.00%   38.00% 30.00%    
Ireland statutory income tax rate 12.50%         12.50%    
Gross tax effected unrecognized tax benefits             $ 2,358  
Amount of unrecognized tax benefits which may impact effective tax rate             2,225  
Total net accrued interest, net of tax benefit             $ 119  
Income Tax Examination, Penalties and Interest Accrued $ 49       $ 49      
Estimated benefit to tax expense 27              
Restructuring and impairment costs 235   $ 0 $ 154 235 $ 154    
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount   $ 76            
Release of tax indemnification reserve 226              
Net actuarial gain         $ 8 $ 0    
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Restructuring Charges, Amount       23        
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities       25        
2016 Restructuring Plan [Member]                
Income Taxes, Additional Information [Line Items]                
Restructuring and impairment costs               $ 620
2016 Restructuring Plan [Domain]                
Income Taxes, Additional Information [Line Items]                
Restructuring and impairment costs               222
Global Products                
Income Taxes, Additional Information [Line Items]                
Impairment of Long-Lived Assets to be Disposed of 235              
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount $ 53              
Global Products | 2016 Restructuring Plan [Domain]                
Income Taxes, Additional Information [Line Items]                
Restructuring and impairment costs               $ 44
Scott Safety business [Member]                
Income Taxes, Additional Information [Line Items]                
Gain on sale of Scott Safety business       114        
Tax effect of gain on sale of Scott Safety business       $ 30        
IRELAND                
Income Taxes, Additional Information [Line Items]                
Ireland statutory income tax rate 12.50%   12.50%   12.50% 12.50%