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Debt - Narrative (Details) - USD ($)
$ in Billions
1 Months Ended 6 Months Ended
Apr. 30, 2020
Mar. 31, 2020
Commercial Paper    
Debt Instrument [Line Items]    
Commercial paper program, amount available   $ 3.0
Credit agreement term   397 days
Senior Notes | 2020 Notes    
Debt Instrument [Line Items]    
Stated interest rate   2.20%
Senior Notes | Subsequent Event | 2020 Notes    
Debt Instrument [Line Items]    
Proceeds from issuance of fixed-rate senior notes $ 4.0  
Senior Notes | Subsequent Event | April 2027 Notes    
Debt Instrument [Line Items]    
Stated interest rate 1.90%  
Senior Notes | Subsequent Event | 2030 Notes    
Debt Instrument [Line Items]    
Stated interest rate 2.05%  
Senior Notes | Subsequent Event | 2040 Notes    
Debt Instrument [Line Items]    
Stated interest rate 2.70%  
Senior Notes | Minimum | Subsequent Event | 2020 Notes    
Debt Instrument [Line Items]    
Credit agreement term 7 years  
Senior Notes | Maximum | Subsequent Event | 2020 Notes    
Debt Instrument [Line Items]    
Credit agreement term 20 years