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Debt (Tables)
 3 Months Ended
Dec. 31, 2016
Debt Disclosure [Abstract]  
Schedule of Debt
The Company had outstanding debt as follows:
 
December 31, 2016
 
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)
 
Commercial Paper
$
567

 
$
(1
)
 
$
566

 
$
—

 
$
—

 
$
—

 
0.79
%
(1) 
1.20% Senior Notes due December 2017 (the "2017 Notes")
1,750

 
(3
)
 
1,747

 
—

 
—

 
—

 
1.37
%
 
Total current maturities of long-term debt and short-term debt
2,317

 
(4
)
 
2,313

 
—

 
—

 
—

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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

 
(12
)
 
2,988

 
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

 
(35
)
 
3,965

 
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

 
(112
)
 
14,138

 
16,000

 
(118
)
 
15,882

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total debt
$
16,567

 
$
(116
)
 
$
16,451

 
$
16,000

 
$
(118
)
 
$
15,882

 
 
 

(1) 
Represents the weighted-average interest rate for the commercial paper outstanding at December 31, 2016.