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Derivative Instruments and Hedging Activities - Narrative (Details)
€ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2023
EUR (€)
instrument
Derivative [Line Items]          
Hedge percentage for foreign exchange transactional exposures, minimum     70.00%    
Hedge percentage for foreign exchange transactional exposures, maximum     90.00%    
Interest rate swaps          
Derivative [Line Items]          
Derivative, number of instruments held | instrument         2
Derivative, notional amount | €         € 200
Net Investment Hedging          
Derivative [Line Items]          
Pre-tax gains (losses) related to net investment hedges recorded in other comprehensive income $ (60,000,000) $ 50,000,000 $ (329,000,000) $ 123,000,000  
Pre-tax gains (losses) related to net investment hedges reclassified from other comprehensive income $ 0 $ 0 $ 0 $ 0