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Debt (Tables) | 6 Months Ended
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Mar. 31, 2020
Debt Disclosure [Abstract] |
Schedule of Debt | The Company had outstanding debt as follows:
| March 31, 2020 |  | September 30, 2019 |  | Effective Interest Rate(1)
| (in millions, except percentages)
Commercial paper | $ | 1,002 |  |  | $ | — |  |  | 1.55 | %
2.20% Senior Notes due December 2020 | 3,000 |  |  | 3,000 |  |  | 2.30 | %
2.15% Senior Notes due September 2022 | 1,000 |  |  | 1,000 |  |  | 2.30 | %
2.80% Senior Notes due December 2022 | 2,250 |  |  | 2,250 |  |  | 2.89 | %
3.15% Senior Notes due December 2025 | 4,000 |  |  | 4,000 |  |  | 3.26 | %
2.75% Senior Notes due September 2027 | 750 |  |  | 750 |  |  | 2.91 | %
4.15% Senior Notes due December 2035 | 1,500 |  |  | 1,500 |  |  | 4.23 | %
4.30% Senior Notes due December 2045 | 3,500 |  |  | 3,500 |  |  | 4.37 | %
3.65% Senior Notes due September 2047 | 750 |  |  | 750 |  |  | 3.73 | %
Total debt | 17,752 |  |  | 16,750 |  |  |
Unamortized discounts and debt issuance costs | (103 | ) |  | (108 | ) |  |
Hedge accounting fair value adjustments(2) | 243 |  |  | 87 |  |  |
Total carrying value of debt | $ | 17,892 |  |  | $ | 16,729 |  |  |
Reported as: |  |  |  |  |
Current maturities of debt | $ | 3,999 |  |  | $ | — |  |  |
Long-term debt | 13,893 |  |  | 16,729 |  |  |
Total carrying value of debt | $ | 17,892 |  |  | $ | 16,729 |  |  |
(1) | Effective interest rates disclosed do not reflect hedge accounting adjustments.
(2) Represents the change in fair value of interest rate swap agreements entered into on a portion of certain outstanding senior notes.

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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