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Debt - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
Jul. 25, 2019
Aug. 31, 2020
Apr. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Commercial Paper Program          
Debt Instrument [Line Items]          
Aggregate principal       $ 3,000,000,000.0  
Debt term       397 days  
Commercial paper program, amount outstanding       $ 0 $ 0
Senior Notes | August 2020 Notes          
Debt Instrument [Line Items]          
Aggregate principal   $ 3,300,000,000      
Net aggregate proceeds   $ 3,200,000,000      
Senior Notes | August 2027 Notes          
Debt Instrument [Line Items]          
Debt term   7 years      
Stated interest rate (percent)       0.75%  
Senior Notes | August 2031 Notes          
Debt Instrument [Line Items]          
Debt term   10 years 6 months      
Stated interest rate (percent)       1.10%  
Senior Notes | August 2050 Notes          
Debt Instrument [Line Items]          
Debt term   30 years      
Stated interest rate (percent)       2.00%  
Senior Notes | April 2020 Notes          
Debt Instrument [Line Items]          
Aggregate principal     $ 4,000,000,000.0    
Net aggregate proceeds     $ 4,000,000,000.0    
Senior Notes | April 2027 Notes          
Debt Instrument [Line Items]          
Debt term     7 years    
Stated interest rate (percent)       1.90%  
Senior Notes | April 2030 Notes          
Debt Instrument [Line Items]          
Debt term     10 years    
Stated interest rate (percent)       2.05%  
Senior Notes | April 2040 Notes          
Debt Instrument [Line Items]          
Debt term     20 years    
Stated interest rate (percent)       2.70%  
Line of Credit | Credit Facility | Revolving Credit Facility          
Debt Instrument [Line Items]          
Debt term 5 years        
Maximum borrowing capacity $ 5,000,000,000.0        
Credit facility amount outstanding       $ 0 $ 0