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Derivative Instruments and Hedging Activities - Narrative (Details) | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2021 EUR (€) instrument | Dec. 31, 2021 USD ($) instrument | Sep. 30, 2021 USD ($)
Derivative [Line Items] |  |  |  |  |
Percentage of foreign exchange rate exposure hedged, minimum |  |  | 70.00% | 70.00% |
Percentage of foreign exchange rate exposure hedged, maximum |  |  | 90.00% | 90.00% |
Cash collateral received |  |  |  | $ 0 | $ 0
Cash collateral pledged |  |  |  | $ 0 | $ 0
Interest rate cap |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Number of instruments held | instrument |  |  | 2 | 2 |
Notional amount of derivative asset |  |  |  | $ 200,000,000 |
Net Investment Hedging | Cross-currency interest rate swaps | Japan |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Number of instruments held | instrument |  |  | 0 | 0 |
Net Investment Hedging | Foreign currency exchange derivatives |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Effective portion of pretax gains (loss) related to net investment hedges | $ 29,000,000 | $ (58,000,000) |  |  |
Gains (losses) reclassified into income for net investment hedges | 0 | 0 |  |  |
Cash Flow Hedging |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Loss recognized in the consolidated statements of income (loss) resulting from ineffectiveness of cash flow hedges | $ 0 | $ 0 |  |  |
Derivatives and Hedging Activities Designated as Hedging Instruments under ASC 815 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional value of derivative liability | € |  |  | € 1,000,000,000 |  |
Interest rate |  |  | 3.50% | 3.50% |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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