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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2020
Mar. 31, 2019
Sep. 30, 2019
Income Taxes, Additional Information [Line Items]              
Effective income tax rate 5.00%   15.00%   15.00% 27.00%  
Ireland statutory income tax rate     12.50%     12.50%  
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount $ 22 $ 30   $ 76      
Gross tax effected unrecognized tax benefits             $ 2,451
Amount of unrecognized tax benefits which may impact effective tax rate             2,121
Total net accrued interest, net of tax benefit             $ 181
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense         $ 35 $ 31  
Restructuring and impairment costs 62   $ 0   $ 173 $ 0  
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Restructuring Charges, Amount   16          
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) 62            
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount $ 4            
2020 Restructuring Plan              
Income Taxes, Additional Information [Line Items]              
Restructuring and impairment costs   111          
2020 Restructuring Plan | Continuing Operations              
Income Taxes, Additional Information [Line Items]              
Restructuring and impairment costs   111          
Global Products | 2020 Restructuring Plan              
Income Taxes, Additional Information [Line Items]              
Restructuring and impairment costs   $ 87          
IRELAND              
Income Taxes, Additional Information [Line Items]              
Ireland statutory income tax rate 12.50%   12.50%   12.50% 12.50%