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Derivative Instruments and Hedging Activities - Narrative (Details)
€ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Mar. 31, 2024
EUR (€)
Mar. 31, 2024
CNY (¥)
Sep. 30, 2023
USD ($)
Derivative [Line Items]              
Percentage of foreign exchange rate exposure hedged, minimum 70.00%   70.00%   70.00% 70.00%  
Percentage of foreign exchange rate exposure hedged, maximum 90.00%   90.00%   90.00% 90.00%  
Cash collateral received $ 0   $ 0       $ 0
Cash collateral pledged 0   0       0
Pre tax gain to be reclassified within next 12 months 27,000,000   27,000,000        
Cash Flow Hedging              
Derivative [Line Items]              
Ineffectiveness recognized from cash flow hedges 0 $ 0 0 $ 0      
Foreign currency exchange derivatives | Net Investment Hedging              
Derivative [Line Items]              
Effective portion of pretax gains (loss) related to net investment hedges 1,000,000 (2,000,000) (1,000,000) (71,000,000)      
Gains (losses) reclassified into income for net investment hedges 0 $ 0 0 $ 0      
China | Cross-currency interest rate swaps | Net Investment Hedging              
Derivative [Line Items]              
Notional amount of derivative asset 96,000,000   96,000,000     ¥ 685,000,000  
3.50% Notes due in 2024 | Unsecured debt              
Derivative [Line Items]              
Long-term debt, gross $ 133,000,000   $ 133,000,000   € 123   $ 130,000,000
Interest rate 3.50% 3.50% 3.50% 3.50% 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%   3.50% 3.50%