Quarterly report pursuant to Section 13 or 15(d)

Credit Facilities (Details)

v3.19.1
Credit Facilities (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Mar. 31, 2019
Sep. 30, 2018
Revolving Credit Facility [Member]    
Line of Credit Facility [Abstract]    
Credit Facility, Maximum Borrowing Capacity $ 5,000  
Line of Credit Facility, Interest Rate Description Loans under the Revolving Credit Facility will bear interest, at our option, at either the reserve-adjusted Eurocurrency Rate (determined in accordance with the Revolving Credit Facility) or the Base Rate (determined in accordance with the Revolving Credit Facility), in each case plus an applicable margin based on our long-term unsecured senior, non-credit enhanced debt ratings. The margins over the reserve-adjusted Eurocurrency Rate and the Base Rate will be 0.805% and 0.00% per annum, respectively.  
Debt Instrument, Ticking Fee The Revolving Credit Facility has a facility fee, which accrues at a rate of 0.07% per annum.  
Line of Credit Facility, Covenant Terms maintain a ratio of consolidated earnings before interest, taxes, depreciation and amortization to consolidated interest expense, as defined in each of the respective agreements, of not less than three to one at the end of each fiscal quarter  
Line of Credit Facility, Covenant Compliance we were in compliance with the applicable covenants  
Revolving Credit Facility [Member] | February 2020 [Member]    
Line of Credit Facility [Abstract]    
Credit Facility, Maximum Borrowing Capacity $ 530  
Credit Facility, Expiration Date Feb. 18, 2020  
Revolving Credit Facility [Member] | November 2021 [Member]    
Line of Credit Facility [Abstract]    
Credit Facility, Maximum Borrowing Capacity $ 4,470  
Credit Facility, Expiration Date Nov. 08, 2021  
Commercial Paper [Member]    
Line of Credit Facility [Abstract]    
Credit Facility, Maximum Borrowing Capacity $ 5,000  
Outstanding Commercial Paper Classified as Short-term debt $ 1,000 $ 1,000
Commercial Paper, Weighted Average Interest Rate 2.74% 2.35%
Commercial Paper [Member] | Minimum [Member]    
Line of Credit Facility [Abstract]    
Debt Instrument, Term 1 day  
Commercial Paper [Member] | Maximum [Member]    
Line of Credit Facility [Abstract]    
Debt Instrument, Term 397 days  
Commercial Paper [Member] | Weighted Average [Member]    
Line of Credit Facility [Abstract]    
Commercial Paper, Weighted Average Remaining Term 29 days 16 days