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Debt
 3 Months Ended
Dec. 31, 2018
Debt Disclosure [Abstract]  
Debt
Note 6—Debt
The Company had outstanding debt as follows:
 
December 31, 2018
 
September 30, 2018
 
Effective Interest Rate
 
(in millions, except percentages)
2.20% Senior Notes due December 2020
$
3,000

 
$
3,000

 
2.30
%
2.15% Senior Notes due September 2022
1,000

 
1,000

 
2.30
%
2.80% Senior Notes due December 2022
2,250

 
2,250

 
2.89
%
3.15% Senior Notes due December 2025
4,000

 
4,000

 
3.26
%
2.75% Senior Notes due September 2027
750

 
750

 
2.91
%
4.15% Senior Notes due December 2035
1,500

 
1,500

 
4.23
%
4.30% Senior Notes due December 2045
3,500

 
3,500

 
4.37
%
3.65% Senior Notes due September 2047
750

 
750

 
3.73
%
Total debt
16,750

 
16,750

 
 
Unamortized discounts and debt issuance costs
(117
)
 
(120
)
 
 
Total long-term debt
$
16,633

 
$
16,630

 
 

The Company recognized interest expense for its senior notes of $137 million and $138 million for the three months ended December 31, 2018 and 2017, respectively, as non-operating expense.