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Debt
 3 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]  
Debt
Note 4—Debt
The Company had outstanding debt as follows:
 
December 31, 2017
 
September 30, 2017
 
 
 
Principal Amount
 
Unamortized Discounts and Debt Issuance Costs
 
Carrying Amount
 
Principal Amount
 
Unamortized Discounts and Debt Issuance Costs
 
Carrying Amount
 
Effective Interest Rate
 
(in millions, except percentages)
1.20% Senior Notes due December 2017 (the "2017 Notes")
$
—

 
$
—

 
$
—

 
$
1,750

 
$
(1
)
 
$
1,749

 
1.37
%
Total current maturities of long-term debt
—

 
—

 
—

 
1,750

 
(1
)
 
1,749

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2.20% Senior Notes due December 2020
3,000

 
(9
)
 
2,991

 
3,000

 
(10
)
 
2,990

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

 
(7
)
 
993

 
1,000

 
(7
)
 
993

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

 
(10
)
 
2,240

 
2,250

 
(10
)
 
2,240

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

 
(31
)
 
3,969

 
4,000

 
(33
)
 
3,967

 
3.26
%
2.75% Senior Notes due September 2027
750

 
(10
)
 
740

 
750

 
(10
)
 
740

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

 
(14
)
 
1,486

 
1,500

 
(15
)
 
1,485

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

 
(38
)
 
3,462

 
3,500

 
(37
)
 
3,463

 
4.37
%
3.65% Senior Notes due September 2047
750

 
(10
)
 
740

 
750

 
(10
)
 
740

 
3.73
%
Total long-term debt
16,750

 
(129
)
 
16,621

 
16,750

 
(132
)
 
16,618

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total debt
$
16,750

 
$
(129
)
 
$
16,621

 
$
18,500

 
$
(133
)
 
$
18,367

 
 

Senior Notes
On October 11, 2017, the Company redeemed all of the $1.75 billion principal amount outstanding of the 2017 Notes. The redemption was funded with net proceeds from new fixed-rate senior notes issued by the Company in September 2017. As a result of this redemption, we recorded a $1 million loss on extinguishment of debt during the three months ended December 31, 2017.
The Company recognized interest expense for the senior notes of $138 million and $125 million for the three months ended December 31, 2017 and 2016, respectively, as non-operating expense.