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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
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

X

- Definition

Nominal or face amount used to calculate payments on the derivative asset.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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-Section 50
-Paragraph 1A
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-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959

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The number of derivative instruments of a particular group held by the entity.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
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+ References

No definition available.

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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.

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