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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2017
Income Taxes, Additional Information [Line Items]      
Discrete non-cash tax charge $ 101    
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount $ 305    
Effective income tax rate 50.00% (7.00%)  
U.S. federal statutory income tax rate 21.00% 35.00%  
Gross tax effected unrecognized tax benefits     $ 2,173
Amount of unrecognized tax benefits which may impact effective tax rate     2,047
Total net accrued interest, net of tax benefit     $ 99
Estimated benefit to tax expense $ 25    
Restructuring and impairment costs 158 $ 78  
Transaction and integration costs 50 130  
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Restructuring Charges, Amount $ 24 14  
Blended 2018 U.S. Effective Tax Rate [Member]      
Income Taxes, Additional Information [Line Items]      
U.S. federal statutory income tax rate 25.00%    
U.S. Effective Tax Rate, Prior to Enacted Tax Reform [Member]      
Income Taxes, Additional Information [Line Items]      
U.S. federal statutory income tax rate 35.00%    
Change in Entity Status [Domain]      
Income Taxes, Additional Information [Line Items]      
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount   101  
Transaction and integration costs [Member]      
Income Taxes, Additional Information [Line Items]      
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount $ 7 $ 11  
Other Property [Member] | Blended 2018 U.S. Effective Tax Rate [Member]      
Income Taxes, Additional Information [Line Items]      
U.S. federal statutory income tax rate 8.00%    
Cash [Member] | Blended 2018 U.S. Effective Tax Rate [Member]      
Income Taxes, Additional Information [Line Items]      
U.S. federal statutory income tax rate 15.50%