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Debt (Tables)
 12 Months Ended
Sep. 30, 2017
Debt Disclosure [Abstract]  
Outstanding debt
The Company had outstanding debt as follows:
 
September 30, 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 2017 (the "2017 Notes")
$
1,750

 
$
(1
)
 
$
1,749

 
$
—

 
$
—

 
$
—

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

 
(1
)
 
1,749

 
—

 
—

 
—

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

 
—

 
—

 
1,750

 
(4
)
 
1,746

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

 
(10
)
 
2,990

 
3,000

 
(12
)
 
2,988

 
2.30
%
2.15% Senior Notes due September 2022 (the "September 2022 Notes")
1,000

 
(7
)
 
993

 
—

 
—

 
—

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

 
(10
)
 
2,240

 
2,250

 
(12
)
 
2,238

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

 
(33
)
 
3,967

 
4,000

 
(36
)
 
3,964

 
3.26
%
2.75% Senior Notes due 2027 (the "2027 Notes")
750

 
(10
)
 
740

 
—

 
—

 
—

 
2.91
%
4.15% Senior Notes due 2035 (the "2035 Notes")
1,500

 
(15
)
 
1,485

 
1,500

 
(15
)
 
1,485

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

 
(37
)
 
3,463

 
3,500

 
(39
)
 
3,461

 
4.37
%
3.65% Senior Notes due 2047 (the "2047 Notes")
750

 
(10
)
 
740

 
—

 
—

 
—

 
3.73
%
Total long-term debt
16,750

 
(132
)
 
16,618

 
16,000

 
(118
)
 
15,882

 
 
Total debt
$
18,500

 
$
(133
)
 
$
18,367

 
$
16,000

 
$
(118
)
 
$
15,882

 
 
Debt Instrument Redemption
Series
 
Maturity/Par Call Date
 
Spread
2020 Notes
 
November 14, 2020
 
10 bps
September 2022 Notes
 
August 15, 2022
 
10 bps
December 2022 Notes
 
October 14, 2022
 
12.5 bps
2025 Notes
 
September 14, 2025
 
15 bps
2027 Notes
 
June 15, 2027
 
12.5 bps
2035 Notes
 
June 14, 2035
 
20 bps
2045 Notes
 
June 14, 2045
 
20 bps
2047 Notes
 
March 15, 2047
 
15 bps
Future Principal Payments on Outstanding Debt
Future principal payments on the Company's outstanding debt are as follows:
Fiscal Year
2018
 
2019
 
2020
 
2021
 
2022
 
Thereafter
 
Total
(in millions)
$
1,750

 
$
—

 
$
—

 
$
3,000

 
$
1,000

 
$
12,750

 
$
18,500