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Debt (Tables) | 6 Months Ended
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Mar. 31, 2019
Debt Disclosure [Abstract] |
Components of Long-Term Debt Including Associated Interest Rates and Related Estimated Fair Values | Components of long-term debt including the associated interest rates and related estimated fair values by calendar maturity (in millions, except interest rates):
| Mar 31, 2019 |  | Sep 30, 2018 |  | Stated Interest Rate | Effective Interest Rate (1)
Issuance | Amount | Estimated Fair Value |  | Amount | Estimated Fair Value |
2018 notes | $ | — |  | $ | — |  |  | $ | 350.0 |  | $ | 350 |  |  | 2.000 | % | 2.012 | %
2020 notes | 500.0 |  | 496 |  |  | 500.0 |  | 490 |  |  | 2.200 | % | 2.228 | %
2021 notes | 500.0 |  | 495 |  |  | 500.0 |  | 489 |  |  | 2.100 | % | 2.293 | %
2021 notes | 250.0 |  | 248 |  |  | 250.0 |  | 244 |  |  | 2.100 | % | 1.600 | %
2022 notes | 500.0 |  | 500 |  |  | 500.0 |  | 486 |  |  | 2.700 | % | 2.819 | %
2023 notes (2) | 750.0 |  | 780 |  |  | 750.0 |  | 759 |  |  | 3.850 | % | 2.859 | %
2023 notes | 1,000.0 |  | 1,010 |  |  | 1,000.0 |  | 986 |  |  | 3.100 | % | 3.107 | %
2024 notes (3) | 767.4 |  | 768 |  |  | 748.4 |  | 743 |  |  | 0.372 | % | 0.462 | %
2025 notes | 1,250.0 |  | 1,290 |  |  | 1,250.0 |  | 1,249 |  |  | 3.800 | % | 3.721 | %
2026 notes | 500.0 |  | 473 |  |  | 500.0 |  | 451 |  |  | 2.450 | % | 2.511 | %
2028 notes | 600.0 |  | 605 |  |  | 600.0 |  | 576 |  |  | 3.500 | % | 3.529 | %
2028 notes | 750.0 |  | 784 |  |  | 750.0 |  | 754 |  |  | 4.000 | % | 3.958 | %
2045 notes | 350.0 |  | 347 |  |  | 350.0 |  | 330 |  |  | 4.300 | % | 4.348 | %
2047 notes | 500.0 |  | 452 |  |  | 500.0 |  | 438 |  |  | 3.750 | % | 3.765 | %
2048 notes | 1,000.0 |  | 1,023 |  |  | 1,000.0 |  | 977 |  |  | 4.500 | % | 4.504 | %
Total | 9,217.4 |  | 9,271 |  |  | 9,548.4 |  | 9,322 |  |  |  |
Aggregate debt issuance costs and unamortized premium/(discount), net | (65.4 | ) |  |  | (69.3 | ) |  |  |  |
Hedge accounting fair value adjustment (2) | (10.5 | ) |  |  | (39.0 | ) |  |  |  |
Total | $ | 9,141.5 |  |  |  | $ | 9,440.1 |  |  |  |  |
(1) | Includes the effects of the amortization of any premium or discount and any gain or loss upon settlement of related treasury locks or forward-starting interest rate swaps utilized to hedge the interest rate risk prior to the debt issuance.
(2) | Amount represents the change in fair value due to changes in benchmark interest rates related to our 2023 notes. Refer to Note 4, Derivative Financial Instruments, for additional information on our interest rate swap designated as a fair value hedge.
(3) Japanese yen-denominated long-term debt.
Long-Term Debt Maturities | The following table summarizes our long-term debt maturities as of March 31, 2019 by fiscal year (in millions):
Fiscal Year | Total
2020 | $ | — |
2021 | 1,250.0 |
2022 | 500.0 |
2023 | 1,000.0 |
2024 | 1,517.4 |
Thereafter | 4,950.0 |
Total | $ | 9,217.4 |

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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