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Fair Value Measurements - Narrative (Details) € in Millions, $ in Millions, ¥ in Billions | Sep. 30, 2020 JPY (¥) instrument | Sep. 30, 2020 USD ($) instrument | Mar. 31, 2020 instrument | Sep. 30, 2019 JPY (¥) instrument | Sep. 30, 2019 USD ($) instrument | Sep. 30, 2018 EUR (€) instrument
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Quoted Prices in Active Markets (Level 1) |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Fair value of long-term debt | $ |  | $ 4,100 |  |  | $ 3,400 |
Cross-currency interest rate swaps | Europe | Net investment hedging |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Number of instruments | 0 | 0 | 1 |  |  | 2
Notional value of derivative asset | € |  |  |  |  |  | € 160
Cross-currency interest rate swaps | Japan | Net investment hedging |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Number of instruments | 1 | 1 |  | 1 | 1 |
Notional value of derivative asset | ¥ | ¥ 11 |  |  | ¥ 11 |  |
Interest rate cap |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Number of instruments | 2 | 2 |  |  |  |
Notional value of derivative asset | $ |  | $ 200 |  |  |  |

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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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