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Derivative Instruments and Hedging Activities - Narrative (Details)
€ in Millions
3 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2023
EUR (€)
Sep. 30, 2023
USD ($)
Sep. 30, 2023
EUR (€)
Dec. 31, 2022
EUR (€)
Derivative [Line Items]            
Pre-tax (losses) gains associated with net investment hedges $ (32,000,000) $ (64,000,000)        
Maximum amount of loss 189,000,000          
Cash collateral pledged 64,000,000 45,000,000   $ 53,000,000    
Cash collateral received 17,000,000 108,000,000   40,000,000    
Letters of credit            
Derivative [Line Items]            
Cash collateral pledged 30,000,000          
IRPAs            
Derivative [Line Items]            
Notional amount 0 0   0    
Pre-tax net gains associated with interest rate hedges $ 27,000,000          
Forward foreign currency exchange contracts            
Derivative [Line Items]            
Derivative notional amount percent of required need coverage 90.00%   90.00%      
Foreign currency contracts            
Derivative [Line Items]            
Notional amount $ 348,000,000 $ 390,000,000 € 256 $ 425,000,000 € 256 € 331