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Debt
 6 Months Ended
Mar. 31, 2017
Debt Disclosure [Abstract]  
Debt
Note 6—Debt
The Company had outstanding debt as follows:
 
March 31, 2017
 
September 30, 2016
 
 
 
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

 
$
(2
)
 
$
1,748

 
$
—

 
$
—

 
$
—

 
1.37
%
Total current maturities of long-term debt
1,750

 
(2
)
 
1,748

 
—

 
—

 
—

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1.20% Senior Notes due December 2017 (the "2017 Notes")
—

 
—

 
—

 
1,750

 
(4
)
 
1,746

 
1.37
%
2.20% Senior Notes due December 2020 (the "2020 Notes")
3,000

 
(11
)
 
2,989

 
3,000

 
(12
)
 
2,988

 
2.30
%
2.80% Senior Notes due December 2022 (the "2022 Notes")
2,250

 
(11
)
 
2,239

 
2,250

 
(12
)
 
2,238

 
2.89
%
3.15% Senior Notes due December 2025 (the "2025 Notes")
4,000

 
(34
)
 
3,966

 
4,000

 
(36
)
 
3,964

 
3.26
%
4.15% Senior Notes due December 2035 (the "2035 Notes")
1,500

 
(15
)
 
1,485

 
1,500

 
(15
)
 
1,485

 
4.23
%
4.30% Senior Notes due December 2045 (the "2045 Notes")
3,500

 
(39
)
 
3,461

 
3,500

 
(39
)
 
3,461

 
4.37
%
Total long-term debt
14,250

 
(110
)
 
14,140

 
16,000

 
(118
)
 
15,882

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total debt
$
16,000

 
$
(112
)
 
$
15,888

 
$
16,000

 
$
(118
)
 
$
15,882

 
 

Senior Notes
Interest expense for the senior notes was $125 million and $250 million for the three and six months ended March 31, 2017, respectively, as compared to $125 million and $149 million for the same periods in 2016. The Company recognized interest expense as non-operating expense and paid $244 million in interest on the senior notes during the six months ended March 31, 2017.
Commercial Paper Program
The Company maintains a commercial paper program to support its working capital requirements and for other general corporate purposes. During the three months ended March 31, 2017, the Company repaid the $567 million of commercial paper that was issued in December 2016. As of March 31, 2017 and September 30, 2016, the Company had no outstanding obligations under the program.
Credit Facility Extension
On January 27, 2017, the Company extended the term of the $4.0 billion credit facility that was entered into on January 27, 2016. The credit facility will now expire on January 27, 2022. No other terms were materially changed. A brief description of the material terms and conditions of the credit facility are described in the Company's Form 10-K, as filed with the SEC on November 15, 2016.