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Derivative Instruments and Hedging Activities - Narrative (Details) € in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Jan. 31, 2024 USD ($) | Jan. 31, 2024 CNY (¥) | Dec. 31, 2023 EUR (€) | Sep. 30, 2023 USD ($)
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
Pre tax gain to be reclassified within next 12 months | 29,000,000 |  |  |  |  |
Cash Flow Hedging |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Ineffectiveness recognized from cash flow hedges | 0 | $ 0 |  |  |  |
Foreign currency exchange derivatives | Net Investment Hedging |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Effective portion of pretax gains (loss) related to net investment hedges | 0 | (69,000,000) |  |  |  |
Gains (losses) reclassified into income for net investment hedges | 0 | $ 0 |  |  |  |
China | Cross-currency interest rate swaps | Net Investment Hedging | Subsequent Event |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount of derivative asset |  |  | $ 96,000,000 | ¥ 685,000,000 |  |
3.50% Notes due in 2024 | Unsecured debt |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Long-term debt, gross | $ 136,000,000 |  |  |  | € 123 | $ 130,000,000
Interest rate | 3.50% |  |  |  | 3.50% |
3.50% Notes due in 2024 | Unsecured debt | Derivatives and Hedging Activities Designated as Hedging Instruments under ASC 815 |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Interest rate | 3.50% |  |  |  | 3.50% |

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