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Debt (Tables) | 12 Months Ended
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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 |

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- Definition Tabular disclosure of debt instruments or arrangements with redemption features. Includes, but is not limited to, description of debt redemption features, percentage price at which debt can be redeemed by the issuer, and period start and end for debt maturity or redemption. + References No definition available. + Details
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